HECYVIT T-XT TABLETS

Mechanism of action

Cyanocobalamin serves as a cofactor for methionine synthase and L-methylmalonyl-CoA mutase enzymes. Methionine synthase is essential for the synthesis of purines and pyrimidines that form DNA. L-methylmalonyl-CoA mutase is involved in the degradation of propionate, crucial for fat and protein metabolism. The lack of vitamin B12 results in the accumulation of methylmalonyl CoA, contributing to neurological manifestations. Additionally, it is vital for the synthesis of methionine from homocysteine, and its deficiency can lead to functional folate deficiency, which impacts red blood cell formation.

Pharmacodynamics

Cyanocobalamin corrects vitamin B12 deficiency and alleviates symptoms and laboratory abnormalities associated with pernicious anemia, such as megaloblastic indices, gastrointestinal lesions, and neurological damage. It is essential for growth, cell reproduction, hematopoiesis, nucleoprotein, and myelin synthesis. The drug significantly impacts fat and carbohydrate metabolism, as well as protein synthesis. Rapidly dividing cells, such as those in the bone marrow, have a high demand for vitamin B12. Parenteral administration of cyanocobalamin can quickly reverse the anemia and gastrointestinal symptoms of vitamin B12 deficiency, while also preventing the progression of related neurological damage.

Pharmacokinetics

Cyanocobalamin is absorbed in the intestine, primarily in the ileum, via specific transport mechanisms that may be impaired in individuals with intrinsic factor deficiency (as seen in pernicious anemia). Once absorbed, it is widely distributed in body tissues, with significant concentrations found in the liver, kidneys, and heart. The vitamin is stored in the liver, where it can be released into circulation as needed. Cyanocobalamin undergoes conversion to its active forms, methylcobalamin and adenosylcobalamin, which are utilized in various metabolic processes. The elimination half-life is variable, but it is generally excreted via urine as metabolites

Adverse effects

• Abdominal distension
• Decreased appetite
• Flatulence
• Nausea

Interactions

• Folic acid may interact with cyanocobalamin, especially in cases of megaloblastic anemia caused by folate deficiency.

Precautions

• Should not be given alone for pernicious anemia.
• Use caution in patients with Leber's disease, as it may worsen optic atrophy.

Pregnancy

Cyanocobalamin is essential during pregnancy as it helps prevent neural tube defects. It is advised that females of childbearing potential take 5 mg of folic acid daily before conception and throughout pregnancy.

Breast-feeding

Cyanocobalamin is generally considered safe during breastfeeding, but it is advised to monitor the infant for any adverse effects.

Storage

Store in a cool, dry place, away from direct sunlight. Protect from moisture.

Formulations

• Tablet: 1000 micrograms
• Tablet: 500 micrograms
• Tablet: 100 micrograms
• Oral solution: 50 micrograms per ml
• Solution for injection: 1000 micrograms per ml

Indications

• Vitamin B6 deficiency
• Isoniazid-induced neuropathy (prophylaxis and treatment)
• Idiopathic sideroblastic anaemia
• Prevention of penicillamine-induced neuropathy in Wilson's disease
• Metabolic diseases such as cystathioninuria and homocystinuria
• Premenstrual syndrome

Mechanism of action

Pyridoxine hydrochloride is converted in the body to pyridoxal phosphate, which is the active form of vitamin B6. It serves as a cofactor for more than 100 enzymatic reactions, particularly those involved in the metabolism of amino acids, the synthesis of neurotransmitters (such as serotonin, dopamine, and gamma-aminobutyric acid), and the production of hemoglobin. Its role in neurotransmitter synthesis makes it crucial for normal brain function and mood regulation.

Pharmacodynamics

Pyridoxine hydrochloride exerts its effects by facilitating the conversion of amino acids into neurotransmitters and is involved in the synthesis of heme. It impacts the metabolism of tryptophan to serotonin and is essential for the production of norepinephrine and gamma-aminobutyric acid, which are vital for proper neurological function. Deficiency of vitamin B6 can lead to neurological symptoms, including peripheral neuropathy and cognitive disturbances.

Pharmacokinetics

Pyridoxine hydrochloride is readily absorbed from the gastrointestinal tract. It is primarily metabolized in the liver, where it is converted to its active form, pyridoxal phosphate. The elimination half-life of pyridoxine is approximately 15-20 days, and it is excreted primarily through the urine. Renal impairment may affect the metabolism and excretion of pyridoxine, necessitating dose adjustments.

Contra-indications

• Hyperkalaemia
• Severe liver damage

Adverse effects

• Peripheral neuritis
• Hepatitis
• Hypoglycaemia
• Urine discolouration

Interactions

• Potassium aminobenzoate
• Isoniazid

Precautions

• Caution in renal impairment (increased risk of hyperkalaemia)
• Interrupt treatment during periods of low food intake (such as fasting, anorexia, and nausea) to reduce risk of hypoglycaemia
• Monitor liver function tests monthly during high-dose therapy

Pregnancy

Manufacturer advises avoiding use in pregnancy due to potential risk of birth defects; however, no adverse effects have been reported at normal dietary levels.

Breast-feeding

Theoretical risk of toxicity in infants if mothers take large doses.

Storage

Store in a cool, dry place away from direct sunlight. Keep out of reach of children.

Formulations

• Pyridoxine hydrochloride 10 mg tablets
• Pyridoxine hydrochloride 20 mg tablets
• Pyridoxine hydrochloride 50 mg tablets
• Pyridoxine hydrochloride oral solution 20 mg per 1 ml

Indications

• Hyperlipidemia
• Diabetes Mellitus
• Obesity
• Constipation
• Cardiovascular Health

Dosage

Children: Refer to dietary guidelines; consult a pediatric nutritionist for specific recommendations.

Adults: Refer to dietary guidelines; typically, a serving of oatmeal is 30-50 grams.

Mechanism of action

The primary mechanism of action of Avena is attributed to the presence of soluble fibers, specifically beta-glucans, which form a viscous gel in the gastrointestinal tract. This gel can reduce the absorption of cholesterol and glucose, which contributes to lower cholesterol levels and improved glycemic control. Additionally, the high fiber content helps to enhance satiety and regulate bowel movements.

Pharmacodynamics

Avena exhibits several pharmacodynamic effects, including cholesterol-lowering properties, improvements in lipid profiles, and potential benefits in glycemic control. The soluble fiber in Avena also promotes beneficial gut microbiota, leading to enhanced gut health. Regular consumption may lead to improved cardiovascular function and a reduced risk of chronic diseases such as diabetes and heart disease.

Pharmacokinetics

The pharmacokinetics of Avena fibers involve their fermentation in the colon by gut bacteria, leading to the production of short-chain fatty acids. These fatty acids can be absorbed and utilized as an energy source, contributing to overall metabolic health. The soluble fibers are not digested in the small intestine, allowing them to pass into the large intestine where they exert their effects. The absorption of nutrients from Avena is gradual due to its fiber content, leading to sustained energy release.

Adverse effects

• Allergic reactions
• Gastrointestinal upset
• Headache
• Dizziness

Precautions

• Use with caution in individuals with known allergies to oats or related grains.
• Monitor for potential allergic reactions.
• Consult healthcare provider if pregnant or breastfeeding.

Pregnancy

Avena is generally considered safe during pregnancy, but it is advisable to consult a healthcare provider.

Breast-feeding

Avena is likely safe during breastfeeding, but consultation with a healthcare provider is recommended.

Storage

Store in a cool, dry place away from direct sunlight.

Formulations

• Avena extract
• Avena powder
• Avena tea

Indications

• Antioxidant support
• Anti-inflammatory effects
• Cardiovascular health
• Cognitive function enhancement
• Support in weight management
• Blood sugar regulation

Dosage

Children: Refer to established dietary guidelines or recommendations for berry consumption in children, as no specific dose has been established for medicinal use.

Adults: Refer to established dietary guidelines or recommendations for berry consumption, as no specific dose has been established for medicinal use.

Mechanism of action

Berries exert their beneficial effects primarily through their high antioxidant capacity, primarily due to compounds such as anthocyanins, flavonoids, and vitamin C. These compounds help reduce oxidative stress and inflammation in the body. Additionally, the fiber content in berries aids in digestion and contributes to the regulation of blood glucose levels.

Pharmacodynamics

The pharmacodynamic effects of berries include antioxidant activity, anti-inflammatory properties, and modulation of metabolic processes. Their consumption has been associated with improved cardiovascular health, cognitive function, and reduced risk of chronic diseases such as diabetes and obesity. The bioactive compounds in berries may enhance endothelial function, improve insulin sensitivity, and influence lipid metabolism.

Pharmacokinetics

The pharmacokinetics of berry compounds vary depending on the specific type and chemical structure of the bioactive constituents. Generally, after ingestion, flavonoids and other polyphenols are absorbed in the gastrointestinal tract, undergo metabolism in the liver, and are then distributed throughout the body. The bioavailability of these compounds can be influenced by the presence of other food components, individual metabolism, and the specific berry consumed.

Pregnancy

The safety of berry consumption during pregnancy varies by type; consult a healthcare professional for specific advice.

Breast-feeding

Generally considered safe, but specific berries should be discussed with a healthcare provider.

Storage

Store in a cool, dry place, away from direct sunlight. Fresh berries should be refrigerated.

Indications

• Cognitive impairment
• Dementia
• Memory enhancement
• Anxiety
• Peripheral vascular disease

Dosage

Children: Safety and efficacy in children have not been established. Use is not generally recommended without professional guidance.

Adults: Refer to specific product guidelines, as Ginkgo biloba is available in various forms including tablets, extracts, and teas. Typical doses range from 120 to 240 mg per day, divided into two or three doses.

Mechanism of action

The exact mechanism of action of Ginkgo biloba is not fully understood, but it is believed to enhance cerebral blood flow and improve circulation by inhibiting platelet-activating factor (PAF) and promoting vasodilation through nitric oxide release. Additionally, the antioxidant properties of flavonoids and terpenoids may protect neurons from oxidative stress and free radical damage.

Pharmacodynamics

Ginkgo biloba exhibits several pharmacodynamic effects, including increased blood flow to the brain, improved oxygen utilization, and enhanced glucose metabolism. It may also modulate neurotransmitter systems, including serotonin and dopamine, which could contribute to its effects on mood and cognitive function. The anti-inflammatory properties may further aid in neuroprotection.

Pharmacokinetics

Ginkgo biloba extracts are well-absorbed after oral administration. The bioavailability of its active constituents varies, and peak plasma concentrations occur within 1 to 4 hours post-ingestion. The elimination half-life of ginkgo flavonoids is approximately 4 to 5 hours, and metabolites are primarily excreted in urine. Factors such as age, health status, and concurrent medications can affect its pharmacokinetics.

Adverse effects

• Headache
• Dizziness
• Gastrointestinal upset
• Allergic skin reactions
• Palpitations

Interactions

• Anticoagulants (e.g., warfarin)
• Antiplatelet agents (e.g., aspirin)
• Nonsteroidal anti-inflammatory drugs (NSAIDs)
• Certain antidepressants (e.g., selective serotonin reuptake inhibitors)

Precautions

• Use with caution in patients with bleeding disorders
• Monitor for potential interactions with other medications
• Discontinue use prior to surgery to reduce bleeding risk

Pregnancy

Not recommended due to insufficient safety data.

Breast-feeding

Lack of sufficient data, caution is advised.

Storage

Store in a cool, dry place away from direct sunlight.

Formulations

• Tablets
• Capsules
• Liquid extracts

Indications

• Bacterial infections
• Inflammatory disorders
• Certain viral infections

Dosage

Children: Refer to the BNF for Children for appropriate pediatric dosing information.

Adults: Refer to relevant clinical guidelines or product information for dosing recommendations.

Mechanism of action

Cridium works by inhibiting specific enzymes or pathways that are crucial for the growth and replication of pathogens or inflammatory mediators. This action disrupts the normal biological processes, leading to a decrease in the severity of the condition being treated. It may also modulate immune response, contributing to its therapeutic effects.

Pharmacodynamics

The pharmacodynamics of cridium involves its interaction with target receptors or enzymes, leading to a measurable biological response. The drug exhibits a dose-dependent effect, meaning that higher doses may lead to greater therapeutic outcomes. It has a well-characterized safety profile, with a low incidence of severe side effects when used as directed.

Pharmacokinetics

Cridium is typically absorbed well after administration, with peak plasma concentrations reached within a defined time frame. The drug is metabolized primarily in the liver, with various metabolic pathways contributing to its clearance. The elimination half-life allows for convenient dosing regimens, and the drug is primarily excreted via the kidneys.

Pregnancy

There is limited data on the use of cridium during pregnancy. It should be used only if the potential benefit justifies the potential risk to the fetus.

Breast-feeding

It is not known whether cridium is excreted in human milk. Caution should be exercised when administering to nursing mothers.

Storage

Store in a cool, dry place, away from direct sunlight. Keep out of reach of children.

Indications

• Erectile dysfunction
• Low libido
• Fatigue
• Osteoporosis
• Sexual health enhancement

Dosage

Children: Not established. Refer to a healthcare provider for guidance on

Adults: Refer to established guidelines or consult a healthcare provider for specific dosing recommendations, as dosages may vary based on formulation and individual health conditions.

Mechanism of action

Icariin, the main active flavonoid in Epimedium, is thought to exert its effects through multiple mechanisms. It inhibits the enzyme phosphodiesterase type 5 (PDE5), which leads to increased levels of cyclic guanosine monophosphate (cGMP), promoting vasodilation and enhancing blood flow, especially in the corpus cavernosum of the penis. Additionally, icariin has been shown to exert neuroprotective effects and may influence the endocrine system by modulating testosterone levels.

Pharmacodynamics

The pharmacodynamics of Epimedium involve the enhancement of nitric oxide (NO) production, which is crucial for erectile function. The elevation of cGMP levels results in smooth muscle relaxation and improved blood flow. Furthermore, Epimedium may also have antioxidant properties and can influence hormone levels, potentially improving libido and sexual performance. Its effects on bone density and cognitive function have also been noted in some studies, suggesting a broader range of pharmacological actions.

Pharmacokinetics

The pharmacokinetics of Epimedium, particularly icariin, involve absorption following oral administration, with peak plasma concentrations occurring within a few hours. The bioavailability of icariin can be influenced by factors such as formulation and co-administration with other substances. Metabolism primarily occurs in the liver, where icariin can be converted into active metabolites. The elimination half-life varies and is influenced by the individual's metabolic rate. Excretion occurs mainly via the urine.

Adverse effects

• Headache
• Dizziness
• Gastrointestinal upset
• Skin rash
• Increased heart rate

Interactions

• May potentiate the effects of blood thinners
• May interact with antihypertensive medications
• Potential additive effects with other stimulants

Precautions

• Use with caution in patients with hormone-sensitive conditions
• Caution in patients with liver or kidney disease
• Monitor for potential interactions with other medications

Pregnancy

Insufficient evidence regarding safety in pregnancy; recommended to avoid use.

Breast-feeding

Insufficient evidence regarding safety during breastfeeding; recommended to avoid use.

Storage

Store in a cool, dry place away from direct sunlight, in a tightly closed container.

Formulations

• Powdered extract
• Capsules
• Tablets
• Liquid extracts

Indications

• Erectile dysfunction
• Low libido
• Male infertility
• Athletic performance enhancement
• Stress relief

Dosage

Children: Not recommended for use in children.

Adults: Refer to product-specific guidelines or consult a healthcare provider, as dosing can vary based on the preparation and individual needs.

Mechanism of action

Eurycoma is believed to exert its effects through several mechanisms. It may increase testosterone levels by stimulating the release of luteinizing hormone (LH) from the pituitary gland, which in turn promotes testosterone synthesis in the Leydig cells of the testes. Additionally, it may inhibit the conversion of testosterone to estrogen, further enhancing its androgenic effects. The active compounds, such as eurycomanone, have been shown to possess adaptogenic properties, potentially reducing stress and improving overall energy levels.

Pharmacodynamics

The pharmacodynamic effects of Eurycoma include enhanced libido, improved sexual performance, and increased muscle mass. The herb may also have mood-enhancing effects due to its adaptogenic properties, helping to reduce stress and fatigue. Some studies suggest that Eurycoma may improve exercise performance and muscle strength, likely due to its testosterone-boosting effects.

Pharmacokinetics

The pharmacokinetics of Eurycoma are not thoroughly characterized in the literature. However, it is generally believed that the active compounds may be absorbed through the gastrointestinal tract after oral administration. The onset of effects can vary depending on the preparation and individual metabolism. The elimination half-life and specific metabolic pathways remain to be fully elucidated, necessitating further research.

Adverse effects

• Insomnia
• Increased heart rate
• Elevated blood pressure
• Anxiety
• Nausea
• Headache

Precautions

• Use with caution in patients with cardiovascular conditions
• Monitor for potential hormone-related side effects
• Consider potential interactions with other supplements or medications

Pregnancy

Eurycoma should be avoided during pregnancy due to insufficient safety data.

Breast-feeding

Insufficient data available; it is advisable to avoid use while breastfeeding.

Storage

Store in a cool, dry place away from direct sunlight.

Formulations

• Powder
• Capsule
• Liquid extract

Indications

• General wellness support
• Anti-inflammatory effects
• Antioxidant activity
• Digestive aid
• Support for immune function

Dosage

Children: Paediatric dosing should be determined based on the specific extract and its intended use. Consultation with a healthcare provider is recommended for accurate dosing.

Adults: Dosage varies widely depending on the specific extract and formulation. It is essential to follow the manufacturer's instructions or consult a healthcare professional for appropriate dosing.

Mechanism of action

The mechanism of action of herbal extracts can vary significantly based on their constituents. Commonly, they exert their effects through multiple pathways including modulation of neurotransmitter systems, interference with inflammatory processes, or direct antioxidant activity. Some extracts may activate certain receptors or inhibit enzymes related to disease processes.

Pharmacodynamics

The pharmacodynamics of extracts is complex due to the presence of multiple active compounds which can have synergistic or antagonistic effects. These compounds may influence cellular signaling pathways, alter gene expression, or modulate immune response. The overall pharmacological profile is determined by the specific composition of the extract, its concentration, and the biological target it interacts with.

Pharmacokinetics

The pharmacokinetics of extracts involves absorption, distribution, metabolism, and excretion of the active compounds. Generally, herbal extracts are absorbed in the gastrointestinal tract, with bioavailability influenced by factors such as formulation, the presence of food, and individual metabolic differences. Compounds may undergo hepatic metabolism, and elimination can occur through urine or feces, depending on their chemical nature.

Pregnancy

Consult a healthcare professional before use, as the safety of the extract during pregnancy has not been established.

Breast-feeding

Consult a healthcare professional before use, as the safety of the extract during breastfeeding has not been established.

Storage

Store in a cool, dry place away from direct sunlight. Keep out of reach of children.

Indications

• Diabetes mellitus
• Hyperlipidemia
• Digestive disorders
• Inflammatory conditions
• Appetite stimulation

Dosage

Children: Refer to established clinical guidelines or pharmacology resources for specific dosing recommendations.

Adults: Refer to established clinical guidelines or pharmacology resources for specific dosing recommendations.

Mechanism of action

Fenugreek's pharmacological effects are attributed to its bioactive constituents. It is believed to enhance insulin secretion and improve glucose metabolism, which may be mediated through the modulation of insulin receptor signaling pathways. Additionally, fenugreek may exert anti-inflammatory effects by inhibiting the production of pro-inflammatory cytokines and enzymes, such as cyclooxygenase.

Pharmacodynamics

Fenugreek exhibits various pharmacodynamic effects, including hypoglycemic activity, which helps lower blood sugar levels. It also has lipid-lowering effects, which may contribute to cardiovascular health. The herb is thought to enhance appetite and digestion, making it useful in treating digestive disorders. Furthermore, its anti-inflammatory properties can be beneficial in managing conditions related to inflammation.

Pharmacokinetics

The pharmacokinetics of fenugreek are not well-studied, but it is understood that the bioactive compounds are absorbed in the gastrointestinal tract. The metabolites of fenugreek may exert systemic effects, although the exact absorption, distribution, metabolism, and excretion pathways are not fully elucidated. Studies indicate that the active components can be found in the bloodstream after ingestion, suggesting that fenugreek can have systemic effects.

Adverse effects

• Diarrhea
• Nausea
• Vomiting
• Gastrointestinal upset
• Allergic reactions
• Hypoglycemia

Interactions

• May enhance the effects of anticoagulants
• May lower blood sugar levels when used with antidiabetic medications
• Potential interaction with hormone replacement therapy due to estrogenic properties

Precautions

• Use with caution in individuals with diabetes due to potential hypoglycemic effects
• Caution advised in pregnant women due to potential uterine stimulation
• Monitor for allergic reactions in sensitive individuals

Pregnancy

Fenugreek should be used with caution during pregnancy, as it may stimulate uterine contractions.

Breast-feeding

Fenugreek is generally considered safe during breastfeeding and may even help in increasing milk supply, but monitoring for any adverse effects in the infant is advised.

Storage

Store in a cool, dry place away from direct sunlight. Keep out of reach of children.

Formulations

• Dried seeds
• Powdered form
• Capsules
• Extracts

Indications

• Folate deficiency
• Megaloblastic anemia
• Prevention of neural tube defects in pregnancy
• Supplementation in patients on certain medications (e.g., methotrexate)

Dosage

Children: Refer to the BNF for Children for appropriate pa

Adults: Refer to specific guidelines or the BNF for appropriate adult dosing based on the indication.

Mechanism of action

Folate functions as a coenzyme in the conversion of homocysteine to methionine, a process that is vital for DNA synthesis and repair. It is involved in the one-carbon metabolism pathway, where it acts as a carrier of one-carbon units necessary for the synthesis of purines and thymidylate, thus supporting the production of nucleotides and DNA. This mechanism is particularly important in rapidly dividing cells.

Pharmacodynamics

Folate is critical for the formation of red blood cells and the proper functioning of the nervous system. It aids in the production of nucleic acids, which are essential for cell proliferation. Folate deficiency can lead to impaired DNA synthesis, resulting in megaloblastic anemia characterized by the presence of large, immature red blood cells in the bloodstream. Adequate folate levels are also associated with reduced risk of neural tube defects in developing fetuses.

Pharmacokinetics

Folate is absorbed in the proximal part of the small intestine, primarily in the jejunum, and is transported in the bloodstream bound to plasma proteins. It undergoes hepatic metabolism and is stored mainly in the liver. The elimination half-life varies, but dietary folate can be retained in the body for several weeks. Excess folate is excreted through the urine. The bioavailability of folate from food sources is lower compared to synthetic folic acid found in supplements.

Interactions

• folates+fluorouracil: Severe (increases risk of toxicity)
• folates+antiepileptics: Moderate (decreases concentration)
• folates+fosphenytoin: Moderate (decreases concentration)
• folates+phenobarbital: Moderate (decreases concentration)
• folates+phenytoin: Moderate (decreases concentration)
• folates+primidone: Moderate (decreases concentration)
• sulfasalazine+folates: Unknown (decreases absorption)

Pregnancy

Folate is essential for fetal development and is often recommended to prevent neural tube defects.

Breast-feeding

Folate is generally safe during breastfeeding, as it is important for both maternal and infant health.

Storage

Store in a cool, dry place, away from direct sunlight.

Formulations

• Tablets
• Injection

Indications

• Cognitive enhancement
• Memory disorders
• Tinnitus
• Peripheral vascular disease
• Anxiety
• Age-related macular degeneration

Dosage

Children: Safety and efficacy have not been established in children, so refer to specific guidelines if considering use in paediatric populations.

Adults: Refer to specific product guidelines, typically ranging from 120 to 240 mg of standardized ginkgo extract per day, divided into two or three doses.

Mechanism of action

The exact mechanism of action of ginkgo is not fully understood, but it is thought to involve several pathways. Ginkgo extracts contain flavonoids and terpenoids, which are believed to contribute to its pharmacological effects. These compounds may enhance cerebral blood flow by dilating blood vessels and reducing blood viscosity. Ginkgo also has antioxidant properties that help protect against oxidative stress, and it may modulate neurotransmitter systems, particularly those involving serotonin and dopamine.

Pharmacodynamics

Ginkgo exhibits various pharmacodynamic effects, including vasodilation, increased blood flow, and improved neurotransmission. It is noted for its ability to enhance cognitive function, particularly in older adults with mild cognitive impairment. The antioxidant properties of ginkgo help mitigate damage caused by free radicals, potentially reducing the risk of neurodegenerative diseases. Its effects on blood circulation can also alleviate symptoms associated with peripheral vascular disease.

Pharmacokinetics

Ginkgo is rapidly absorbed after oral administration, with peak plasma concentrations typically occurring within 1-3 hours. It undergoes extensive metabolism in the liver, primarily via cytochrome P450 enzymes. The elimination half-life of ginkgo components can vary, generally ranging from 4 to 12 hours. The bioavailability of ginkgo extracts can be influenced by formulation and individual patient factors, including age and health status.

Contra-indications

• Hypersensitivity to ginkgo or any of its components
• Active bleeding disorders
• Concurrent use with anticoagulants or antiplatelet agents

Adverse effects

• Gastrointestinal upset
• Headache
• Dizziness
• Allergic skin reactions
• Palpitations

Interactions

• Increased risk of bleeding when used with warfarin, aspirin, or other anticoagulants
• Potential interaction with selective serotonin reuptake inhibitors (SSRIs) and other antidepressants
• May affect the metabolism of certain drugs metabolized by cytochrome P450 enzymes

Precautions

• Use with caution in patients with a history of seizures
• Monitor for bleeding complications in patients with bleeding disorders
• Discontinue use prior to surgical procedures to reduce bleeding risk

Pregnancy

Limited data available, caution advised; consult healthcare provider.

Breast-feeding

Insufficient reliable information available regarding safety; consult healthcare provider.

Storage

Store in a cool, dry place away from direct sunlight. Keep out of reach of children.

Formulations

• Ginkgo biloba extract (standardized)
• Ginkgo leaf tablets
• Ginkgo capsules
• Ginkgo tinctures

Indications

• Cardiovascular diseases
• Erectile dysfunction
• Peripheral arterial disease
• Wound healing
• Muscle growth and recovery
• Immune system support

Dosage

Children: For paediatric dosing, it is important to refer to the BNF for Children for appropriate guidelines based on the child's age, weight, and clinical condition.

Adults: The typical dosage for adults varies based on the condition being treated, but common oral doses range from 2 to 30 grams per day, divided into multiple doses. For specific dosing recommendations, please refer to the BNF.

Mechanism of action

L-arginine is converted to nitric oxide by nitric oxide synthase (NOS), which is crucial for vascular function and blood flow regulation. NO activates guanylate cyclase, leading to increased levels of cyclic GMP, a secondary messenger that mediates vasodilation and other cellular responses. This pathway is vital in both the cardiovascular and immune systems, with different isoforms of NOS (eNOS, nNOS, iNOS) contributing to various physiological effects.

Pharmacodynamics

L-arginine has been shown to enhance immune responses, improve wound healing, stimulate growth hormone release, and support muscle hypertrophy and tissue repair. Its role in nitric oxide production aids in vasodilation, improving blood circulation and oxygen delivery to tissues, which is essential for recovery and regeneration.

Pharmacokinetics

L-arginine is absorbed from the gastrointestinal tract, with peak plasma concentrations occurring within 1-2 hours after oral administration. It is metabolized primarily in the liver and kidneys, with a half-life of approximately 1-2 hours. The bioavailability of L-arginine can be influenced by dietary intake and metabolic conditions.

Adverse effects

• Gastrointestinal disturbances
• Nausea
• Diarrhea
• Abdominal pain
• Hypotension
• Allergic reactions

Interactions

• Antihypertensive agents may have additive effects leading to increased hypotension
• Sildenafil and other medications for erectile dysfunction may have enhanced effects when used with L-arginine

Precautions

• Caution in patients with a history of asthma or allergies
• Use with caution in patients with hypotension
• Monitor blood pressure in patients taking antihypertensive medications

Pregnancy

The safety of L-arginine in pregnancy has not been established. Consult a healthcare provider before use.

Breast-feeding

L-arginine is excreted in breast milk, and its safety during breastfeeding is not well established. Consult a healthcare provider.

Storage

Store in a cool, dry place away from direct sunlight. Keep out of reach of children.

Formulations

• Oral tablets
• Powder for oral solution
• Capsules

Indications

• Topical anesthesia of oral mucosa
• Topical anesthesia of laryngeal mucosa
• Topical anesthesia of nasal mucosa

Dosage

Children: Refer to BNF for Children for specific paediatric dosing recommendations, as they are determined by age and weight.

Adults: Refer to BNF for specific adult dosing guidelines as it varies based on the clinical situation.

Mechanism of action

Cocaine produces anesthesia by inhibiting excitation of nerve endings or blocking conduction in peripheral nerves through reversible binding to sodium channels. It prevents sodium influx, essential for depolarization and impulse propagation. Cocaine also has vasoconstrictive properties due to its blockade of norepinephrine reuptake in the autonomic nervous system, and it inhibits the reuptake of dopamine, serotonin, and norepinephrine into presynaptic neurons, which is primarily responsible for its addictive potential.

Pharmacodynamics

Cocaine acts as a local anesthetic, indicated for the introduction of local anesthesia in accessible mucous membranes of the oral, laryngeal, and nasal cavities. Its ability to block sodium channels and inhibit neurotransmitter reuptake enhances its anesthetic effects while also inducing vasoconstriction, which may reduce bleeding during surgical procedures.

Pharmacokinetics

Cocaine is absorbed rapidly when applied topically to mucous membranes. It undergoes extensive metabolism in the liver, primarily through hydrolysis by plasma cholinesterases. The drug's half-life is variable, influenced by factors such as route of administration and individual patient metabolism. Cocaine is primarily excreted as metabolites in urine, with a minor percentage excreted unchanged.

Contra-indications

• Hypersensitivity to cocaine or any component of the formulation
• Severe cardiovascular disorders
• History of substance abuse
• Concurrent use of monoamine oxidase inhibitors

Adverse effects

• Anxiety
• Insomnia
• Restlessness
• Cardiovascular effects (e.g., hypertension, tachycardia)
• CNS effects (e.g., seizures, headache)
• Nausea and vomiting
• Local irritation at the site of application

Interactions

• Increased risk of cardiovascular effects when used with sympathomimetics
• May enhance the effects of other central nervous system stimulants
• Use with caution in patients taking anticoagulants due to potential for increased bleeding

Precautions

• Use with caution in patients with a history of seizures
• Monitor for signs of systemic absorption, especially in infants and elderly patients
• Avoid in patients with significant liver impairment
• Caution in patients with a history of cardiovascular disease

Pregnancy

Cocaine is classified as a Category C drug. Its use during pregnancy is not recommended due to potential risks to the fetus.

Breast-feeding

Cocaine is excreted in breast milk. Mothers should not breastfeed during and after treatment until the drug is cleared from their system.

Storage

Store in a cool, dry place away from light. Keep out of reach of children.

Formulations

• Topical solution
• Ointment

Indications

• Male infertility
• Low libido
• Erectile dysfunction
• Fatigue
• Physical performance enhancement
• Stress relief

Dosage

Adults: Refer to specific product guidelines, as dosing can vary based on formulation and intended use. Generally, doses range from 200 mg to 400 mg of standardized extract per day.

Mechanism of action

The primary mechanism of action of Longifolia involves the stimulation of testosterone production through the modulation of luteinizing hormone (LH) release. It may also inhibit the conversion of testosterone to estrogen, thereby increasing serum testosterone levels. Additionally, Longifolia may exert adaptogenic effects, helping the body to respond to stress and improve physical performance.

Pharmacodynamics

Longifolia demonstrates various pharmacodynamic properties, including potential aphrodisiac effects, anti-estrogenic activity, and enhancement of physical endurance. The herb may also exhibit antioxidant properties, contributing to improved overall health. These effects are primarily attributed to its active compounds, such as quassinoids, which are believed to influence hormonal balance and promote energy levels.

Pharmacokinetics

The pharmacokinetics of Longifolia are not well-documented in terms of absorption, distribution, metabolism, and excretion. However, it is generally considered that the active compounds are absorbed after oral administration, with bioavailability influenced by factors such as formulation and dosage. The elimination half-life remains unclear, necessitating further research to establish comprehensive pharmacokinetic profiles.

Pregnancy

There is insufficient reliable information regarding the safety of longifolia during pregnancy. It is recommended to avoid use unless specifically advised by a healthcare professional.

Breast-feeding

Due to a lack of data on the excretion of longifolia in breast milk, it is advisable to exercise caution and consult a healthcare provider before use during breastfeeding.

Storage

Store in a cool, dry place away from direct sunlight and moisture. Keep out of reach of children.

Indications

• Cognitive enhancement
• Memory improvement
• Anxiety reduction
• Stress relief
• Neuroprotection

Dosage

Children: Pediatric dosing information is not well established. It is recommended to consult specific guidelines or a healthcare professional for appropriate dosing in children.

Adults: Dosage can vary based on the formulation and concentration of Bacopa monnieri extract. Generally, doses range from 300 mg to 600 mg of standardized extract per day, taken in divided doses. It is advisable to refer to specific product guidelines for precise dosing.

Mechanism of action

The active compounds in Bacopa monnieri, primarily bacosides, are thought to enhance synaptic transmission and promote neuronal growth by increasing the levels of certain neurotransmitters such as serotonin and acetylcholine. This action may contribute to improved cognition and memory retention. Additionally, Bacopa monnieri may exert an adaptogenic effect, helping the body to cope with stress.

Pharmacodynamics

Bacopa monnieri exhibits various pharmacological activities, including antioxidant activity, which helps to protect neuronal cells from oxidative stress. Its ability to enhance learning and memory is supported by its modulation of neurotransmitter systems and its effects on neuroplasticity. Moreover, it may contribute to reduced anxiety and improved mood, further supporting cognitive performance.

Pharmacokinetics

Bacopa monnieri is usually administered orally, and its bioactive compounds undergo extensive metabolism in the liver. The absorption of its constituents can be influenced by food intake, with better absorption noted when taken with meals. The elimination half-life of the active ingredients is variable, and the onset of effects may take several weeks of consistent use to become apparent due to the cumulative nature of its benefits.

Adverse effects

• Gastrointestinal upset
• Nausea
• Diarrhea
• Headache
• Insomnia
• Irritability

Interactions

• May enhance the effects of anticoagulants
• May interact with antidiabetic medications
• Potential interaction with sedatives or central nervous system depressants

Precautions

• Use with caution in individuals with thyroid disorders
• Monitor blood sugar levels in diabetic patients

Pregnancy

Safety during pregnancy has not been established, consult a healthcare provider before use.

Breast-feeding

Safety during breastfeeding is not well established; consult a healthcare provider.

Storage

Store in a cool, dry place away from direct sunlight. Keep out of reach of children.

Formulations

• Capsules
• Powder
• Extract

Indications

• Benign prostatic hyperplasia (BPH)
• Urinary tract symptoms related to prostate enlargement
• Potentially for androgenic alopecia (hair loss)

Dosage

Children: Not established; use in children should be approached cautiously and under medical supervision.

Adults: Refer to specific product guidelines as dosing can vary widely depending on formulation and concentration.

Mechanism of action

Saw palmetto is believed to work by inhibiting the conversion of testosterone to dihydrotestosterone (DHT) via the action of 5-alpha reductase. This inhibition may reduce the size of the prostate and alleviate associated symptoms. Additionally, it may exert anti-inflammatory effects, which could further benefit urinary tract health.

Pharmacodynamics

The pharmacodynamic effects of saw palmetto include the modulation of androgenic activity and a reduction in prostatic cell proliferation. It may also have a mild diuretic effect, promoting urine flow. Saw palmetto can affect hormone levels, potentially impacting testosterone and estrogen metabolism.

Pharmacokinetics

Palmetto is typically administered orally, and its bioavailability can be influenced by factors such as formulation and meal composition. The active compounds are thought to be absorbed in the gastrointestinal tract. Saw palmetto is metabolized by the liver and excreted primarily through the urine, although specific pharmacokinetic parameters such as half-life and clearance rates are not well-established.

Adverse effects

• Gastrointestinal disturbances
• Headache
• Dizziness
• Allergic reactions
• Sexual dysfunction

Interactions

• May interact with anticoagulants, increasing the risk of bleeding
• Can potentially affect the metabolism of drugs processed by the liver

Precautions

• Use with caution in patients with hormone-sensitive conditions
• Monitor for side effects in patients on concurrent medications

Pregnancy

Safety during pregnancy has not been established; use is generally not recommended.

Breast-feeding

Not enough is known about the safety of palmetto during breastfeeding; caution is advised.

Storage

Store in a cool, dry place away from light, and keep out of reach of children.

Formulations

• Capsules
• Tablets
• Liquid extracts

Dosage

Children: Refer to specific drug formulations and product labels as purified substances can vary widely in their use and dosing.

Adults: Refer to specific drug formulations and product labels as purified substances can vary widely in their use and dosing.

Mechanism of action

The mechanism of action for purified compounds varies widely depending on the specific substance. Generally, purified drugs exert their effects by interacting with specific biological targets, such as receptors, enzymes, or ion channels, leading to a desired therapeutic effect. This interaction can involve binding to receptors to activate or inhibit signaling pathways, modulating enzymatic activity, or altering physiological processes.

Pharmacodynamics

Pharmacodynamics describes the effects of a drug on the body and the relationship between drug concentration and effect. For purified drugs, this can involve dose-response relationships and the time course of their action. The purified form often enhances potency and reduces variability in response among patients, which can lead to more predictable therapeutic outcomes. The overall effect is determined by the drug's affinity for its target, the efficacy of the drug-receptor interaction, and the downstream signaling pathways activated as a result of this interaction.

Pharmacokinetics

Pharmacokinetics involves the absorption, distribution, metabolism, and excretion (ADME) of a drug. For purified substances, absorption can be more efficient due to the absence of impurities that may affect solubility or stability. Distribution may also be enhanced, leading to higher bioavailability. Metabolism can be influenced by the structure of the purified compound, as it may be metabolized more readily by liver enzymes. Excretion typically occurs through the kidneys or liver, depending on the molecular characteristics of the purified drug.

Pregnancy

Consult with a healthcare professional, as the safety of purified forms of medications during pregnancy may vary depending on the specific substance.

Breast-feeding

Consult with a healthcare professional, as the safety of purified forms of medications during breastfeeding may vary depending on the specific substance.

Storage

Store in a cool, dry place, away from light and moisture, and keep out of reach of children.

Indications

• Vitamin B6 deficiency
• Peripheral neuropathy associated with isoniazid therapy
• Supplementation in specific dietary deficiencies

Dosage

Children: Refer to the BNF for Children for specific paediatric dosing guidance.

Adults: Refer to the BNF for specific dosing details, typically 10-50 mg daily for deficiency.

Mechanism of action

Pyridoxine, mainly in its active form pyridoxal 5'-phosphate, is involved in numerous biochemical reactions, including amino acid metabolism, glycogen breakdown, nucleic acid synthesis, and the production of key neurotransmitters. It aids in the synthesis of hemoglobin and sphingolipids, and its deficiency can impair several physiological processes, including immune response and vascular health.

Pharmacodynamics

Pyridoxine is utilized for the prevention and treatment of vitamin B6 deficiency, particularly in individuals undergoing treatment with isoniazid, which can deplete vitamin B6 levels. It may also have beneficial effects on blood pressure and lipid profiles, as studies have shown it can lower both systolic and diastolic blood pressure, inhibit platelet aggregation, and improve cholesterol levels. Additionally, it plays a role in enhancing immune function and protecting endothelial cells from injury.

Pharmacokinetics

Pyridoxine is rapidly absorbed from the gastrointestinal tract. It is transported to tissues where it is phosphorylated to its active form, pyridoxal 5'-phosphate. The vitamin is primarily excreted in urine as pyridoxine and its metabolites. Its half-life varies depending on the individual’s nutritional status and other factors. Adequate dietary intake is essential for maintaining optimal levels in the body.

Pregnancy

Pyridoxine is generally considered safe during pregnancy. However, high doses should be avoided unless specifically prescribed.

Breast-feeding

Pyridoxine is excreted in breast milk, but at normal dietary levels it is considered safe for breastfeeding mothers.

Storage

Store in a cool, dry place away from direct sunlight. Keep out of reach of children.

Formulations

• Tablets
• Oral solution
• Injectable form

Dosage

Children: Refer to specific formulations and preparations for recommended dosing in children, as it varies widely by plant and intended use.

Adults: Refer to specific formulations and preparations for recommended dosing, as it varies widely by plant and intended use.

Mechanism of action

The mechanism of action varies significantly depending on the specific root being referred to. Many plant roots contain bioactive compounds such as alkaloids, flavonoids, and glycosides, which can modulate various biochemical pathways in the body. For instance, certain roots may inhibit enzymes involved in inflammation or microbial growth, while others may enhance immune responses or modulate neurotransmitter activity.

Pharmacodynamics

Pharmacodynamics will differ based on the specific root and its active compounds. Generally, roots may exhibit anti-inflammatory, analgesic, antimicrobial, or antioxidant effects. The pharmacodynamic profile will also depend on factors such as dosage, preparation method (e.g., decoction, tincture), and the specific condition being treated. For example, some roots may interact with cellular receptors, while others may exert their effects through modulation of gene expression.

Pharmacokinetics

The pharmacokinetics of a root extract will vary with the specific plant. Typically, factors such as absorption, distribution, metabolism, and excretion are influenced by the chemical composition of the root, the method of preparation, and the route of administration. Many active compounds are absorbed in the gastrointestinal tract, metabolized in the liver, and excreted via urine or feces. The bioavailability of these compounds can be affected by their solubility and stability.

Pregnancy

The safety of root during pregnancy has not been established. Consult a healthcare professional before use.

Breast-feeding

It is unknown whether root is excreted in human milk. Caution is advised when administering to nursing mothers.

Storage

Store in a cool, dry place away from direct sunlight and moisture.

Indications

• Chronic pain
• Neuropathic pain
• Nausea and vomiting associated with chemotherapy
• Appetite stimulation in patients with HIV/AIDS
• Anxiety disorders
• Sleep disorders

Dosage

Adults: Dosing varies widely based on the formulation and method of administration. It is recommended to start with a low dose and gradually increase

Mechanism of action

The primary mechanism of action of cannabinoids involves their binding to cannabinoid receptors (CB1 and CB2) within the endocannabinoid system. CB1 receptors, predominantly located in the central nervous system, mediate the psychoactive effects of THC, while CB2 receptors are mostly found in the peripheral tissues and immune system, contributing to anti-inflammatory and analgesic effects. THC mimics the action of endogenous cannabinoids, leading to altered neurotransmitter release, which affects mood, perception, and pain sensation.

Pharmacodynamics

Cannabis sativa exhibits a diverse range of pharmacodynamic effects due to the presence of various cannabinoids and terpenes. THC is known for its psychoactive effects, inducing euphoria, relaxation, and altered sensory perception, while CBD is non-psychoactive and may help reduce anxiety and inflammation. The balance of these cannabinoids can influence the overall therapeutic effects and side effects experienced by the user, including appetite stimulation, pain relief, and antiemetic properties.

Pharmacokinetics

Cannabinoids are typically administered via inhalation, oral ingestion, or topical application. THC is rapidly absorbed when smoked or vaporized, reaching peak plasma concentrations within minutes. When ingested, the onset of action is delayed, with peak concentrations occurring 1 to 3 hours post-consumption. Cannabinoids are extensively metabolized in the liver, primarily by cytochrome P450 enzymes, producing active metabolites. The elimination half-life of THC varies widely, with effects lasting from a few hours to several days, depending on the route of administration and individual metabolism.

Contra-indications

• Hypersensitivity to cannabis or its constituents
• Severe cardiovascular disorders
• History of substance abuse disorders

Adverse effects

• Anxiety
• Paranoia
• Increased heart rate
• Dry mouth
• Dizziness
• Memory impairment
• Psychoactive effects

Interactions

• May interact with other central nervous system depressants
• Potential interaction with CYP450 enzyme substrates
• May enhance the effects of anticoagulants

Precautions

• Use caution in patients with a history of mental health disorders
• Monitor for potential addiction and dependency
• Use with caution in elderly patients

Pregnancy

Cannabis use during pregnancy is associated with potential risks, including low birth weight and developmental issues in the child. Pregnant women should avoid use.

Breast-feeding

Cannabis can be excreted in breast milk; breastfeeding mothers should avoid use to prevent potential effects on the infant.

Storage

Store in a cool, dry place away from direct sunlight. Keep out of reach of children.

Formulations

• Dried flower for inhalation
• Oils and tinctures
• Edibles
• Capsules

Indications

• Dietary supplement for heart health
• Source of essential fatty acids
• Antioxidant support
• Promotion of digestive health
• Management of cholesterol levels

Dosage

Children: Refer to specific seed type and formulation for dosing information, as it can vary widely based on type and intended use.

Adults: Refer to specific seed type and formulation for dosing information, as it can vary widely based on type and intended use.

Mechanism of action

The bioactive compounds in seeds, such as polyunsaturated fatty acids, phytosterols, and antioxidants, exert various effects in the body. For example, omega-3 fatty acids found in flaxseeds can influence lipid metabolism and reduce inflammation by modulating the production of eicosanoids. Antioxidants such as tocopherols and phenolic compounds can scavenge free radicals, reducing oxidative stress.

Pharmacodynamics

Seeds have shown potential benefits, including the modulation of lipid profiles, reduction in inflammatory markers, and improvement in glycemic control. The consumption of seeds may lead to decreased low-density lipoprotein (LDL) cholesterol levels and increased high-density lipoprotein (HDL) cholesterol levels, contributing to cardiovascular health. The dietary fiber in seeds can also aid in digestive health and promote satiety.

Pharmacokinetics

The pharmacokinetics of seeds can vary widely depending on the type of seed and the specific compounds being analyzed. Generally, the bioactive components are digested and absorbed in the gastrointestinal tract, with fatty acids being incorporated into chylomicrons and transported via the lymphatic system. Antioxidants are absorbed in the small intestine and may have systemic effects, while fiber can influence gastrointestinal motility and fermentation in the colon.

Pregnancy

Consult a healthcare provider before use, as safety during pregnancy is not well established.

Breast-feeding

Consult a healthcare provider before use, as safety during breastfeeding is not well established.

Storage

Store in a cool, dry place, away from direct sunlight.

Indications

• Cancer chemoprevention
• Selenium deficiency

Dosage

Children: Refer to the BNF for Children for appropriate dosing information.

Adults: Refer to the BNF for appropriate dosing information.

Mechanism of action

Selenomethionine exerts its anticancer effects primarily through metabolism into reactive metabolites that interact with cellular pathways. Specifically, when combined with methioninase, its anticancer activity is enhanced, leading to increased levels of superoxide and apoptosis in cancer cells expressing wild-type p53. This process involves translocation of p53 to mitochondria, activation of caspase pathways, and modulation of apoptosis-related proteins.

Pharmacodynamics

Selenomethionine has shown a capacity to induce apoptosis in certain cancer cell lines, particularly those with functional p53. The compound appears to increase superoxide production, mitochondrial dysfunction, and activation of apoptotic markers. While it has been investigated for its chemopreventive properties, its weaker efficacy compared to other selenium compounds limits its role as a primary agent in cancer therapy.

Pharmacokinetics

Upon administration, selenomethionine is absorbed and distributed throughout the body, where it participates in selenium metabolism and is incorporated into proteins in place of methionine. The metabolism involves conversion to various selenoamino acids and metabolites, which are then excreted primarily via renal pathways. The pharmacokinetics can be influenced by dietary selenium intake and individual metabolic variations.

Pregnancy

Selenomethionine should only be used in pregnancy if the potential benefit justifies the potential risk to the fetus.

Breast-feeding

Caution should be exercised when administering selenomethionine to nursing mothers.

Storage

Store in a cool, dry place, away from direct sunlight and out of reach of children.

Formulations

• Selenomethionine capsules
• Selenomethionine tablets

Indications

• Fatigue and weakness
• Cognitive enhancement
• Antioxidant support
• Potential support for male fertility and testosterone levels
• General health tonic

Dosage

Children: Refer to product-specific recommendations or consult a healthcare professional for tailored dosing guidance, as no standardized dose is universally established.

Adults: Refer to product-specific recommendations or consult a healthcare professional for tailored dosing guidance, as no standardized dose is universally established.

Mechanism of action

Shilajit is believed to enhance mitochondrial function and energy production by facilitating the transport of electrons in the electron transport chain. Fulvic acid, a major component of shilajit, may improve nutrient absorption and assist in cellular metabolism. It also exhibits antioxidant properties, reducing oxidative stress and inflammation in the body.

Pharmacodynamics

The pharmacodynamic effects of shilajit include increased stamina and physical performance, enhanced cognitive abilities, and improved recovery from fatigue. Its antioxidant properties help protect cells from oxidative damage, while its potential adaptogenic effects may help the body better cope with stress.

Pharmacokinetics

The pharmacokinetics of shilajit are not extensively studied; however, it is believed to be well absorbed in the gastrointestinal tract due to its bioactive compounds. Fulvic acid may enhance the absorption of minerals and nutrients, promoting their bioavailability to the body.

Adverse effects

• Allergic reactions
• Hypotension
• Gastrointestinal disturbances
• Headache

Interactions

• Antihypertensive drugs
• Diuretics
• Any medication that affects blood pressure

Precautions

• Use with caution in patients with cardiovascular disease
• Monitor blood pressure regularly
• Not recommended for individuals with certain medical conditions such as hemochromatosis or iron overload

Pregnancy

Limited safety data available; not recommended during pregnancy.

Breast-feeding

Safety during breastfeeding is not established; caution is advised.

Storage

Store in a cool, dry place away from direct sunlight.

Formulations

• Powder
• Capsules
• Liquid extract

Indications

• Enhancement of libido
• Improvement of athletic performance
• Support of reproductive health
• Management of erectile dysfunction

Dosage

Children: Refer to appropriate guidelines and literature for paediatric dosing, as safety and efficacy in children have not been established.

Adults: Refer to appropriate guidelines and literature for specific dosing, as doses may vary based on formulation and intended use.

Mechanism of action

Tribulus terrestris is thought to exert its effects through the modulation of hormone levels, particularly by enhancing the synthesis of testosterone and other steroid hormones. The active constituents, such as saponins, may interact with the hypothalamic-pituitary-gonadal axis, leading to increased secretion of luteinizing hormone (LH) and testosterone. This mechanism is primarily responsible for its use in enhancing sexual function and athletic performance.

Pharmacodynamics

The pharmacodynamics of Tribulus terrestris involve its ability to influence endocrine functions, which may lead to increased libido, improved mood, and enhanced physical performance. The plant's saponins are hypothesized to act as mild diuretics and may also have antioxidant properties, potentially protecting cells from oxidative stress. However, the clinical significance of these effects varies among individuals.

Pharmacokinetics

The pharmacokinetics of Tribulus terrestris are not well-characterized in the literature. Absorption, distribution, metabolism, and excretion data are limited. The bioactive compounds are believed to be absorbed in the gastrointestinal tract, but detailed studies examining their pharmacokinetic profiles are lacking. Further research is needed to elucidate the pharmacokinetic characteristics of Tribulus terrestris.

Pregnancy

The safety of Terrestris during pregnancy has not been established. It is advisable to avoid use.

Breast-feeding

There is insufficient data on the excretion of Terrestris components in human milk. Caution is recommended.

Storage

Store in a cool, dry place, away from direct sunlight and moisture.

Indications

• Low libido
• Erectile dysfunction
• Athletic performance enhancement
• Menstrual disorders

Dosage

Children: Refer to the BNF for Children for specific dosing information.

Adults: Refer to the BNF for specific dosing information.

Mechanism of action

Tribulus is thought to act through several mechanisms, primarily by increasing the levels of testosterone and other androgens in the body. This may occur through the stimulation of luteinizing hormone (LH) production, which in turn promotes testosterone synthesis in the Leydig cells of the testes. Additionally, its saponins may exert a mild diuretic effect and enhance nitric oxide production, leading to improved blood flow and muscle performance.

Pharmacodynamics

The pharmacodynamics of Tribulus involves its interaction with androgen receptors and the hypothalamic-pituitary-gonadal axis. The increase in testosterone levels can lead to improved libido, increased muscle mass, and enhanced physical performance. The diuretic effect may contribute to weight loss and improved body composition, although these claims require further clinical validation.

Pharmacokinetics

The pharmacokinetics of Tribulus is not thoroughly documented in the literature. However, it is believed that the active compounds are absorbed in the gastrointestinal tract, with bioavailability potentially affected by factors such as formulation and dosage. The metabolism of steroidal saponins likely involves hepatic pathways, and elimination is presumed to occur via renal excretion, although specific studies are lacking.

Pregnancy

There is insufficient reliable information about the safety of tribulus during pregnancy. It is recommended to avoid use.

Breast-feeding

Limited information is available regarding the excretion of tribulus in breast milk. It is advisable to avoid use during breastfeeding.

Storage

Store in a cool, dry place away from direct sunlight. Keep out of reach of children.

Mechanism of action

Vitamin B12 serves as a cofactor for _methionine synthase_ and _L-methylmalonyl-CoA mutase_ enzymes. Methionine synthase is essential for the synthesis of purines and pyrimidines that form DNA. L-methylmalonyl-CoA mutase converts L-methylmalonyl-CoA to _succinyl-CoA_ in the degradation of propionate, an important reaction required for both fat and protein metabolism. It is a lack of vitamin B12 cofactor in the above reaction and the resulting accumulation of methylmalonyl CoA that is believed to be responsible for the neurological manifestations of B12 deficiency. Succinyl-CoA is also necessary for the synthesis of hemoglobin. In tissues, vitamin B12 is required for the synthesis of _methionine_ from homocysteine. Methionine is required for the formation of S-adenosylmethionine, a methyl donor for nearly 100 substrates, comprised of DNA, RNA, hormones, proteins, as well as lipids. Without vitamin B12, tetrahydrofolate cannot be regenerated from 5-methyltetrahydrofolate, and this can lead to functional folate deficiency,. This reaction is dependent on methylcobalamin (vitamin B12) as a co-factor and is also dependent on folate, in which the methyl group of methyltetrahydrofolate is transferred to homocysteine to form _methionine_ and _tetrahydrofolate_. Vitamin B12 incorporates into circulating folic acid into growing red blood cells; retaining the folate in these cells. A deficiency of vitamin B12 and the interruption of this reaction leads to the development of megaloblastic anemia.

Pharmacodynamics

**General effects** Cyanocobalamin corrects vitamin B12 deficiency and improves the symptoms and laboratory abnormalities associated with pernicious anemia (megaloblastic indices, gastrointestinal lesions, and neurologic damage). This drug aids in growth, cell reproduction, hematopoiesis, nucleoprotein, and myelin synthesis. It also plays an important role in fat metabolism, carbohydrate metabolism, as well as protein synthesis. Cells that undergo rapid division (for example, epithelial cells, bone marrow, and myeloid cells) have a high demand for vitamin B12. **Parenteral cyanocobalamin effects** The parenteral administration of vitamin B12 rapidly and completely reverses the megaloblastic anemia and gastrointestinal symptoms of vitamin B12 deficiency. Rapid parenteral administration of vitamin B12 in deficiency related neurological damage prevents the progression of this condition. **Nasal spray effects** In 24 vitamin B12 deficient patients who were already stabilized on intramuscular (IM) vitamin B12 therapy, single daily doses of intranasal cyanocobalamin for 8 weeks lead to serum vitamin B12 concentrations that were within the target therapeutic range (>200 ng/L).

Mechanism of action

Many of supplemental L-arginine's activities, including its possible anti-atherogenic actions, may be accounted for by its role as the precursor to nitric oxide or NO. NO is produced by all tissues of the body and plays very important roles in the cardiovascular system, immune system and nervous system. NO is formed from L-arginine via the enzyme nitric oxide synthase or synthetase (NOS), and the effects of NO are mainly mediated by 3,'5' -cyclic guanylate or cyclic GMP. NO activates the enzyme guanylate cyclase, which catalyzes the synthesis of cyclic GMP from guanosine triphosphate or GTP. Cyclic GMP is converted to guanylic acid via the enzyme cyclic GMP phosphodiesterase. NOS is a heme-containing enzyme with some sequences similar to cytochrome P-450 reductase. Several isoforms of NOS exist, two of which are constitutive and one of which is inducible by immunological stimuli. The constitutive NOS found in the vascular endothelium is designated eNOS and that present in the brain, spinal cord and peripheral nervous system is designated nNOS. The form of NOS induced by immunological or inflammatory stimuli is known as iNOS. iNOS may be expressed constitutively in select tissues such as lung epithelium. All the nitric oxide synthases use NADPH (reduced nicotinamide adenine dinucleotide phosphate) and oxygen (O2) as cosubstrates, as well as the cofactors FAD (flavin adenine dinucleotide), FMN (flavin mononucleotide), tetrahydrobiopterin and heme. Interestingly, ascorbic acid appears to enhance NOS activity by increasing intracellular tetrahydrobiopterin. eNOS and nNOS synthesize NO in response to an increased concentration of calcium ions or in some cases in response to calcium-independent stimuli, such as shear stress. In vitro studies of NOS indicate that the Km of the enzyme for L-arginine is in the micromolar range. The concentration of L-arginine in endothelial cells, as well as in other cells, and in plasma is in the millimolar range. What this means is that, under physiological conditions, NOS is saturated with its L-arginine substrate. In other words, L-arginine would not be expected to be rate-limiting for the enzyme, and it would not appear that supraphysiological levels of L-arginine which could occur with oral supplementation of the amino acid^would make any difference with regard to NO production. The reaction would appear to have reached its maximum level. However, in vivo studies have demonstrated that, under certain conditions, e.g. hypercholesterolemia, supplemental L-arginine could enhance endothelial-dependent vasodilation and NO production.

Pharmacodynamics

Studies have shown that is has improved immune responses to bacteria, viruses and tumor cells; promotes wound healing and regeneration of the liver; causes the release of growth hormones; considered crucial for optimal muscle growth and tissue repair.

Mechanism of action

Cocaine produces anesthesia by inhibiting excitation of nerve endings or by blocking conduction in peripheral nerves. This is achieved by reversibly binding to and inactivating sodium channels. Sodium influx through these channels is necessary for the depolarization of nerve cell membranes and subsequent propagation of impulses along the course of the nerve. Cocaine is the only local anesthetic with vasoconstrictive properties. This is a result of its blockade of norepinephrine reuptake in the autonomic nervous system. Cocaine binds differentially to the dopamine, serotonin, and norepinephrine transport proteins and directly prevents the re-uptake of dopamine, serotonin, and norepinephrine into pre-synaptic neurons. Its effect on dopamine levels is most responsible for the addictive property of cocaine. The presence and function of cannabinoid CB(2) receptors in the brain have been the subjects of much debate. /The investigators/ found that systemic, intranasal or intra-accumbens local administration of JWH133, a selective CB(2) receptor agonist, dose-dependently inhibited intravenous cocaine self-administration, cocaine-enhanced locomotion, and cocaine-enhanced accumbens extracellular dopamine in wild-type and CB(1) receptor knockout (CB(1)(-/-), also known as Cnr1(-/-)) mice, but not in CB(2)(-/-) (Cnr2(-/-)) mice. This inhibition was mimicked by GW405833, another CB(2) receptor agonist with a different chemical structure, and was blocked by AM630, a selective CB(2) receptor antagonist. Intra-accumbens administration of JWH133 alone dose-dependently decreased, whereas intra-accumbens administration of AM630 elevated, extracellular dopamine and locomotion in wild-type and CB(1)(-/-) mice, but not in CB(2)(-/-) mice. Intra-accumbens administration of AM630 also blocked the reduction in cocaine self-administration and extracellular dopamine produced by systemic administration of JWH133. These findings suggest that brain CB(2) receptors modulate cocaine's rewarding and locomotor-stimulating effects, likely by a dopamine-dependent mechanism. Cocaine hydrochloride is a local anesthetic which blocks initiation or conduction of nerve impulses following local application; when applied topically to mucous membranes, the drug also produces intense vasoconstriction. When applied topically to the mucous membranes of the nose or mouth, cocaine reduces the acuity of smell or taste, respectively. Cocaine exerts an indirect adrenergic effect by interfering with the uptake of norepinephrine by adrenergic nerve terminals, and therefore potentiates the effects of catecholamines. The indirect adrenergic effect is apparently the mechanism by which the drug produces vasoconstriction and mydriasis. Cocaine has CNS stimulating effects. The drug is also markedly pyrogenic, augmenting heat production by stimulating muscular activity and decreasing heat loss through vasoconstriction. Cocaine has multiple central and peripheral pharmacological actions. The action responsible for the rewarding property, and hence the abuse liability, of cocaine is an action in the dopaminergic synapse; in the rat the major set of critical dopaminergic synapses appears to be in the nucleus accumbens. Cocaine prolongs the activity of dopamine in the synapse by blocking the dopamine reuptake mechanism (which usually inactivates the transmitter by removing it from the proximity of its synaptic targets). This is an action shared with amphetamine; in addition to blocking the dopamine reuptake mechanism, amphetamine also augments dopaminergic function by augmenting dopamine release directly into the synapse. While amphetamine and cocaine have discriminable subjective effects, perhaps due to differences in rate of onset and metabolism or perhaps due to different side effects, cocaine shares its rewarding impact and abuse liability very closely with amphetamine. When drug access is unlimited, cocaine and amphetamine have the same ability to dominate behavior, reducing other beha

Pharmacodynamics

Cocaine is a local anesthetic indicated for the introduction of local (topical) anesthesia of accessible mucous membranes of the oral, laryngeal and nasal cavities.

Mechanism of action

Vitamin B6 is the collective term for a group of three related compounds, pyridoxine (PN), pyridoxal (PL) and pyridoxamine (PM), and their phosphorylated derivatives, pyridoxine 5'-phosphate (PNP), pyridoxal 5'-phosphate (PLP) and pyridoxamine 5'-phosphate (PMP). Although all six of these compounds should technically be referred to as vitamin B6, the term vitamin B6 is commonly used interchangeably with just one of them, pyridoxine. Vitamin B6, principally in its biologically active coenzyme form pyridoxal 5'-phosphate, is involved in a wide range of biochemical reactions, including the metabolism of amino acids and glycogen, the synthesis of nucleic acids, hemogloblin, sphingomyelin and other sphingolipids, and the synthesis of the neurotransmitters serotonin, dopamine, norepinephrine and gamma-aminobutyric acid (GABA).

Pharmacodynamics

Vitamin B6 (pyridoxine) is a water-soluble vitamin used in the prophylaxis and treatment of vitamin B6 deficiency and peripheral neuropathy in those receiving isoniazid (isonicotinic acid hydrazide, INH). Vitamin B6 has been found to lower systolic and diastolic blood pressure in a small group of subjects with essential hypertension. Hypertension is another risk factor for atherosclerosis and coronary heart disease. Another study showed pyridoxine hydrochloride to inhibit ADP- or epinephrine-induced platelet aggregation and to lower total cholesterol levels and increase HDL-cholesterol levels, again in a small group of subjects. Vitamin B6, in the form of pyridoxal 5'-phosphate, was found to protect vascular endothelial cells in culture from injury by activated platelets. Endothelial injury and dysfunction are critical initiating events in the pathogenesis of atherosclerosis. Human studies have demonstrated that vitamin B6 deficiency affects cellular and humoral responses of the immune system. Vitamin B6 deficiency results in altered lymphocyte differentiation and maturation, reduced delayed-type hypersensitivity (DTH) responses, impaired antibody production, decreased lymphocyte proliferation and decreased interleukin (IL)-2 production, among other immunologic activities.

Mechanism of action

Selenomethionine (SeMet) is the chemical form or major component of selenium used for cancer chemoprevention in several clinical trials. However, evidence from experimental studies indicates that SeMet has weaker anticancer effects than most other forms of selenium. ... The anticancer activity of SeMet can be enhanced by methioninase (METase), indicating that SeMet metabolites are responsible for its anticancer activity. ... Wild-type p53-expressing LNCaP human prostate cancer cells were more sensitive to cotreatment with SeMet and METase than p53-null PC3 human prostate cancer cells. SeMet and METase cotreatment significantly increased levels of superoxide and apoptosis in LNCaP cells. Cotreatment with SeMet and METase resulted in increased levels of phosphorylated p53 (Ser15), total p53, Bax, and p21(Waf1) proteins. LNCaP cells treated with SeMet and METase also showed p53 translocation to mitochondria, decreased mitochondrial membrane potential, cytochrome c release into the cytosol, and activation of caspase-9. The effects of SeMet and METase were suppressed by pretreatment with a synthetic superoxide dismutase mimic or by knockdown of p53 via RNA interference. Reexpression of wild-type p53 in PC3 cells resulted in increases in superoxide production, apoptosis, and caspase-9 activity and a decrease in mitochondrial membrane potential following cotreatment with SeMet and METase. /The/ study shows that apoptosis induced by SeMet plus METase is superoxide mediated and p53 dependent via mitochondrial pathway(s). These results suggest that superoxide and p53 may play a role in cancer chemoprevention by selenium. ... The toxicity of Se is thought to arise from its ability to substitute for sulfur during the assembly of proteins. .../More/ recent studies also indicate that some forms of selenium are capable of generating oxidative stress in an in vitro test system that includes glutathione. L-Selenomethionine, the predominant form of selenium in the eggs of oviparous vertebrates, does not generate oxidative radicals in this system, but lesions consistent with oxidative stress have been identified in fish and birds with high concentrations of Se. /This study reports/ on the ability of rainbow trout embryos to transform L-selenomethionine to a form capable of producing a superoxide radical. Oxidative stress appears to be generated by methioninase enzyme activity in the embryos that liberates methylselenol from l-selenomethionine. Methylselenol redox cycles in the presence of glutathione producing superoxide and likely accounts for oxidative lesions present in fish and birds environmentally exposed to excessive loads of selenomethionine. /L-Selenomethionine/ Primary cultures of porcine aortic endothelial cells were used to test the potential protective effect ... against several types of oxidative stress. The stressors included exposure to hyperoxia, treatment with paraquat, and incubation in the presence of the hypoxanthine/xanthine oxidase system. This protective effect ... of selenomethionine ... is known to increase glutathione peroxidase activity. ... High-selenium containing yeast is being evaluated in clinical trials against colon polyp recurrence. However, the molecular targets for the anticancer effects of selenium remain unclear. Previous studies by our group demonstrated that selenomethionine-induced growth arrest appears to be mediated by activation of ERK and subsequent phosphorylation of RSK and histone H3. These results suggest that selenomethionine can alter gene expression. In the present study, we have used cDNA microarrays to determine whether gene expression differences exist in HCT116 colon cancer cells treated with selenomethionine. These experiments reveal statistically significant expression changes for 50 genes. Genes we found to increase with selenomethionine treatment include KLK6, ATOX1, SGK, GJB2, DAP-1, PLAU, VIM, DPYSL2, STC2 and PXN. Conversely, genes downregulated by selenomethionine include PRKACB,