VITRANOR

Indications

• Iron deficiency anemia
• Prophylaxis of iron deficiency in at-risk populations
• Epithelial tissue changes such as atrophic glossitis and koilonychia

Dosage

Children: For children aged 1 month to 11 years: 0.25 mL per kilogram twice daily, with the total daily dose possibly given in 3 divided doses, not exceeding 20 mL per day. For children aged 12-17 years: 10 mL once daily.

Adults: The dose is calculated according to body weight and the iron deficit, specifying both the iron salt and formulation. For specific dosing, consult product literature.

Mechanism of action

Iron is necessary for the production of hemoglobin. Iron deficiency can lead to decreased production of hemoglobin and a microcytic, hypochromic anemia. Ferrous fumarate releases iron in the gastrointestinal tract, facilitating its absorption and subsequent incorporation into hemoglobin, thus alleviating anemia.

Pharmacodynamics

The major activity of supplemental iron, including ferrous fumarate, is in the prevention and treatment of iron deficiency anemia. Iron also has putative immune-enhancing, anticarcinogenic, and cognition-enhancing activities, supporting overall health and functionality.

Pharmacokinetics

Ferrous fumarate is absorbed in the gastrointestinal tract, with absorption being optimal in an acidic environment. The bioavailability can be influenced by dietary factors, such as the presence of certain foods or medications that may inhibit iron absorption. Once absorbed, iron is transported in the blood bound to transferrin and is stored in tissues as ferritin and hemosiderin. The elimination half-life of iron is variable and depends on the individual's iron status and the amount of iron stored.

Contra-indications

• Iron overload syndromes
• Repeated blood transfusions
• Porphyria cutanea tarda

Adverse effects

• Asthenia
• Drowsiness
• Urine discoloration
• Cold sweat
• Confusion
• Decreased level of consciousness
• Thrombophlebitis
• Headache
• Joint stiffness
• Pain in extremities
• Skin reactions
• Small intestinal bacterial overgrowth
• Thirst
• Nausea
• Constipation
• Diarrhea
• Decreased appetite

Interactions

• Iron absorption may be affected by antacids and certain medications that alter gastric pH.

Precautions

• Monitor iron status to avoid iron overload.
• Caution in patients with intestinal strictures or diverticular disease.
• Care in elderly patients and those on high doses.

Pregnancy

Iron is generally considered safe during pregnancy, but supplementation should be monitored to avoid overload.

Breast-feeding

Iron supplementation may be necessary for exclusively breast-fed infants if maternal iron stores are low.

Storage

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

Formulations

• Solution for injection (Iron as Iron sucrose 20 mg per 1 ml)
• Capsules containing iron formulations

Indications

• Fluid and electrolyte imbalances
• Hypoglycemia
• Nutritional supplementation
• Diabetic emergencies

Dosage

Children: Refer to the BNF for Children for appropriate paediatric dosing guidelines.

Adults: The dosage varies based on the clinical condition and specific formulation used. For intravenous administration, consult product literature for precise dosing.

Mechanism of action

Glucose supplies energy to tissues by undergoing glycolysis, which begins with its phosphorylation by hexokinase to form glucose 6-phosphate. This activates glucose for breakdown, ultimately generating ATP and NADH. The aerobic metabolism of glucose can yield up to 36 ATP molecules. Glucose also serves as a precursor for other biomolecules and regulates various physiological processes including gene transcription and hormone secretion.

Pharmacodynamics

Glucose is an obligatory energy source for cellular activities and plays a significant role in metabolic signaling. It is oxidized to yield energy through glycolysis, the citric acid cycle, and oxidative phosphorylation. Glucose can be converted into fat for energy storage and is stored as glycogen in the liver and muscles. Its administration increases blood glucose levels and stimulates insulin secretion, particularly through oral routes that activate gut incretin hormones.

Pharmacokinetics

Glucose is rapidly absorbed from the gastrointestinal tract or directly into the bloodstream when administered intravenously. It is distributed widely throughout the body and metabolized primarily in tissues requiring energy. The body maintains glucose homeostasis through regulatory mechanisms involving insulin and glucagon. Excess glucose can be stored as glycogen or converted to triglycerides for long-term energy storage.

Adverse effects

• Hyperglycemia
• Increased osmolarity
• Fluid overload
• Electrolyte imbalances

Interactions

• Insulin - may require dose adjustments

Precautions

• Use with caution in patients with diabetes mellitus
• Monitor blood glucose levels in patients receiving parenteral glucose
• Adjust dosage in renal impairment

Pregnancy

Glucose is generally considered safe in pregnancy; however, monitoring is advised, especially in diabetic patients.

Breast-feeding

Glucose is considered safe during breastfeeding, as it is a natural sugar found in breast milk.

Storage

Store at room temperature, away from light. Avoid freezing.

Formulations

• Glucose 5% solution for infusion
• Glucose 10% solution for infusion
• Glucose 0.9% solution for injection
• Glucose sodium chloride combination solutions

Indications

• Iron-deficiency anemia (therapeutic)
• Iron-deficiency anemia (prophylactic)

Dosage

Children: For children aged 1 month to 11 years: 0.25 mL/kilogram twice daily. For children aged 12 to 17 years: 10 mL once daily.

Adults: 280 mg twice daily.

Mechanism of action

Ferrous sulfate acts as a source of iron, which is essential for the synthesis of hemoglobin, the protein in red blood cells that carries oxygen. Iron is absorbed in the intestines, where it is converted into a form that can be incorporated into hemoglobin. The mechanism involves transport proteins that facilitate iron uptake and incorporation into the heme group of hemoglobin.

Pharmacodynamics

The pharmacodynamic effect of ferrous sulfate is the increase in hemoglobin levels and improvement in symptoms of anemia, such as fatigue and weakness. Iron supplementation leads to increased erythropoiesis (red blood cell production) in the bone marrow, effectively correcting the deficit in iron stores and enhancing oxygen-carrying capacity.

Pharmacokinetics

Ferrous sulfate is absorbed in the gastrointestinal tract, particularly in the duodenum and proximal jejunum. The bioavailability of iron from ferrous sulfate can be affected by dietary factors, with enhanced absorption in acidic environments. Peak plasma concentrations typically occur within 2 to 6 hours post-administration. Iron is primarily stored in the liver and bone marrow, and any excess iron is excreted through feces, urine, and sweat.

Contra-indications

• Hypersensitivity to ferrous sulfate or any of its excipients
• Hemochromatosis
• Hemosiderosis
• Thalassemia
• Other anemias not due to iron deficiency

Adverse effects

• Gastrointestinal disturbances (nausea, constipation, diarrhea, abdominal pain)
• Dark stools
• Staining of teeth (with liquid formulations)
• Allergic reactions (rare)

Interactions

• Antacids may reduce the absorption of iron
• Tetracycline antibiotics may interfere with iron absorption
• Ascorbic acid (vitamin C) may enhance iron absorption
• Certain foods and beverages (e.g., tea, coffee, dairy) can decrease iron absorption

Precautions

• Use with caution in patients with peptic ulcer disease
• Monitor for signs of iron overload
• Assess the cause of anemia before initiation of therapy
• Keep out of reach of children to prevent accidental overdose

Pregnancy

Ferrous sulfate is generally considered safe for use during pregnancy to prevent or treat iron-deficiency anemia.

Breast-feeding

Ferrous sulfate is excreted in breast milk in small amounts but is considered safe for breastfeeding mothers.

Storage

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

Formulations

• Ferrous sulfate 200 mg tablets
• Ferrous sulfate 325 mg modified-release tablets
• Ferrous sulfate oral solution 140 mg/5 mL
• Ferrous sulfate drops

Indications

• Primary carnitine deficiency
• Secondary carnitine deficiency (e.g., due to certain metabolic disorders)
• Certain conditions associated with impaired fatty acid oxidation
• Supportive treatment in patients with heart disease or metabolic syndrome

Dosage

Children: Refer to BNF for Children for specific dosing recommendations based on the child's condition and age.

Adults: Refer to BNF for specific dosing recommendations based on the condition being treated.

Mechanism of action

Carnitine facilitates the transport of long-chain fatty acids across the mitochondrial membrane by forming acyl-carnitine derivatives. This process is essential for the β-oxidation of fatty acids, enabling their conversion into acetyl-CoA, which enters the citric acid cycle to produce ATP. Additionally, carnitine plays a role in the removal of toxic acyl groups from the mitochondria, thus helping to detoxify the cell.

Pharmacodynamics

Carnitine enhances fatty acid oxidation and energy production in tissues that rely heavily on fat as a fuel source. It helps maintain cellular energy homeostasis, supports metabolic functions, and may have protective effects against oxidative stress by improving mitochondrial function.

Pharmacokinetics

Carnitine is absorbed in the gastrointestinal tract, with peak plasma concentrations typically occurring within 3-5 hours post-ingestion. It is distributed widely in body tissues, with high concentrations found in skeletal and cardiac muscle. Carnitine is primarily excreted in the urine as free carnitine and acyl-carnitine derivatives. The half-life of carnitine in plasma is approximately 2-3 hours, and its levels can be influenced by dietary intake and renal function.

Adverse effects

• Nausea
• Vomiting
• Abdominal cramps
• Diarrhea
• Fishy body odor

Precautions

• Use with caution in patients with renal impairment
• Monitor for changes in renal function

Pregnancy

Safety in pregnancy has not been established.

Breast-feeding

Carnitine is excreted in breast milk; use caution.

Storage

Store in a cool, dry place, protected from light.

Formulations

• Carnitine oral solution
• Carnitine tablets

Indications

• Vitamin B12 deficiency
• Megaloblastic anemia
• Neuropathy
• Erythropoiesis stimulation

Dosage

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

Adults: Refer to the BNF for specific dosing guidance.

Mechanism of action

Cobalt functions as a key component in the structure of vitamin B12, which is necessary for the normal functioning of cells. It acts as a cofactor in enzymatic reactions, particularly in the metabolism of homocysteine to methionine and in the synthesis of nucleic acids. Cobalt also plays a role in the regulation of erythropoiesis (production of red blood cells) and contributes to the overall cellular metabolism.

Pharmacodynamics

Cobalt is crucial for various biochemical processes, including DNA synthesis and the metabolism of carbohydrates, fats, and proteins. It is primarily known for its role in hematopoiesis and neurological function. Adequate levels of cobalt are essential for preventing megaloblastic anemia, a condition characterized by the production of large, abnormal red blood cells due to impaired DNA synthesis.

Pharmacokinetics

Cobalt is absorbed in the gastrointestinal tract, with better absorption occurring when dietary intake is adequate. Once absorbed, it is distributed throughout the body, particularly in the liver, kidneys, and bone marrow. Cobalt is primarily excreted through the urine. The half-life of cobalt in the body can vary based on the form and the physiological state of the individual. Excess cobalt can lead to toxicity, particularly affecting the thyroid and causing cardiomyopathy.

Pregnancy

Cobalt is classified as a trace element necessary for human health, but excessive exposure may pose risks. Consult specific resources for detailed guidance.

Breast-feeding

Cobalt is excreted in breast milk. The effects on the nursing infant are not well established.

Storage

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

Indications

• Copper deficiency
• Occipital Horn Syndrome
• Menke's disease
• Contraception (via copper IUD)

Dosage

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

Adults: Refer to the relevant clinical guidelines and BNF for specific dosing information.

Mechanism of action

Copper is absorbed from the gastrointestinal tract via high affinity copper uptake proteins and low affinity copper uptake proteins, likely being reduced to the Cu1+ form prior to transport. Inside enterocytes, it binds to the copper transport protein ATOX1, which facilitates its transport to copper transporting ATPase-1 on the Golgi membrane for incorporation into the Golgi apparatus. Once in systemic circulation, copper binds primarily to ceruloplasmin, albumin, and alpha 2-macroglobulin. It acts as a cofactor in a variety of oxidase enzymes and also influences sperm motility when released from copper IUDs, contributing to its contraceptive effect.

Pharmacodynamics

Copper is essential for the activity of many enzymes and plays a vital role in processes such as iron metabolism, neurotransmitter synthesis, and antioxidant defense. Copper ions, particularly when released from intrauterine devices, have been shown to decrease sperm viability, thereby impacting fertility.

Pharmacokinetics

Copper is absorbed from the gut and is predominantly transported in the plasma bound to proteins such as ceruloplasmin and albumin. The absorption efficiency can vary; however, a significant portion of dietary copper is usually absorbed. The body regulates copper levels through hepatic excretion and storage mechanisms, ensuring homeostasis. Excess copper can lead to toxicity, while deficiency results in various health issues.

Pregnancy

Copper is considered essential during pregnancy, but excessive intake should be avoided due to potential toxicity.

Breast-feeding

Copper is excreted in breast milk, and adequate maternal intake is important for infant development.

Storage

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

Mechanism of action

The exact mechanism of action for dichloride compounds can vary significantly depending on the specific drug. Generally, compounds with similar structures may act by inhibiting specific enzymes or interacting with neurotransmitter systems. Such interactions can modulate various physiological responses, potentially leading to therapeutic effects in conditions such as infections or other diseases.

Pharmacodynamics

Pharmacodynamics of dichloride compounds is determined by their ability to interact with biological targets. These interactions can lead to alterations in cellular signaling pathways, influencing processes such as inflammation, pain modulation, or microbial growth inhibition. The presence of chlorine atoms may enhance lipophilicity, affecting the drug's distribution and potency.

Pharmacokinetics

Pharmacokinetics of dichloride compounds typically involves absorption, distribution, metabolism, and excretion (ADME). Absorption may be affected by the route of administration and the compound’s solubility. Distribution is influenced by the compound's lipophilicity and protein binding. Metabolism often occurs in the liver, with potential pathways including oxidation or conjugation. Excretion may occur via renal or hepatic routes, depending on the specific compound's characteristics.

Indications

• Iron deficiency anemia
• Iron deficiency due to inadequate dietary intake
• Anemia associated with chronic disease
• Pregnancy-related anemia

Dosage

Children: Refer to the BNF for Children for specific dosing recommendations based on age and weight.

Adults: Refer to the BNF for specific dosing recommendations, generally, adults may require 100-200 mg of elemental iron daily divided into several doses.

Mechanism of action

Ferrous ions (Fe2+) play a vital role in hemoglobin production by participating in the synthesis of heme, the iron-containing compound essential for oxygen transport in the blood. In addition, iron is a cofactor for various enzymes involved in metabolic pathways, including those related to DNA synthesis and energy production.

Pharmacodynamics

The pharmacodynamic effects of ferrous include increased hemoglobin synthesis, improved oxygen transport, and enhanced cellular energy metabolism. Supplementation leads to an increase in serum ferritin levels and replenishment of iron stores in the body, which is particularly beneficial in cases of iron deficiency anemia.

Pharmacokinetics

Ferrous iron is absorbed primarily in the duodenum and upper jejunum of the small intestine. The absorption rate can be influenced by various factors, including the presence of food, the form of iron, and individual patient characteristics. Once absorbed, ferrous is transported in the bloodstream bound to transferrin, and it is stored in the liver, spleen, and bone marrow as ferritin. The elimination half-life of iron is not well-defined as it is not excreted directly but rather recycled in the body.

Pregnancy

Not contraindicated, but iron supplementation should be done under medical supervision.

Breast-feeding

Iron is excreted in breast milk, but supplementation is generally considered safe.

Storage

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

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

• Manganese deficiency
• Bone health and development
• Antioxidant support
• Enzyme cofactor in metabolic processes

Dosage

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

Adults: Refer to specific clinical guidelines or the BNF for appropriate dosing recommendations.

Mechanism of action

Manganese serves as a cofactor for several enzymes, including manganese superoxide dismutase (MnSOD), which protects cells from oxidative stress by catalyzing the dismutation of superoxide radicals into oxygen and hydrogen peroxide. It also participates in the activation of enzymes involved in carbohydrate, fat, and protein metabolism.

Pharmacodynamics

Manganese plays a role in various biochemical pathways, particularly in the metabolism of amino acids, cholesterol, glucose, and carbohydrates. It is crucial for bone formation and the maintenance of cartilage. Manganese also aids in the synthesis of glycosyltransferases, which are important for the formation of glycoproteins and proteoglycans.

Pharmacokinetics

Manganese is absorbed primarily in the small intestine, with absorption efficiency influenced by dietary factors and the presence of competing minerals. It is transported in the bloodstream bound to proteins such as alpha-2-macroglobulin and transferrin. Manganese is stored in the liver, pancreas, and bones, and is excreted primarily through bile and to a lesser extent in urine. Its half-life in the human body is not well defined due to its trace nature and variable absorption.

Pregnancy

Manganese is classified as a dietary mineral that is essential for human health, but excessive intake should be avoided during pregnancy as it may affect fetal development.

Breast-feeding

Manganese is present in breast milk, and normal dietary intake is considered safe during breastfeeding. However, excessive supplementation should be avoided.

Storage

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

Indications

• Methionine deficiency
• Hepatotoxicity prevention
• Cholesterol management

Mechanism of action

The mechanism of the possible anti-hepatotoxic activity of L-methionine is not entirely clear. It is thought that metabolism of high doses of acetaminophen in the liver leads to decreased levels of hepatic glutathione and increased oxidative stress. L-methionine serves as a precursor to L-cysteine, which has antioxidant properties and is a precursor to glutathione. The antioxidant activity of L-methionine and its metabolites likely contribute to its potential anti-hepatotoxic effects. Methionine also exhibits free-radical scavenging activity and chelating ability due to its sulfur content.

Pharmacodynamics

L-Methionine functions as a primary supplier of sulfur, which is essential for preventing hair, skin, and nail disorders. It aids in lowering cholesterol levels by enhancing the liver's production of lecithin, reducing liver fat, and protecting kidney function. Methionine acts as a natural chelating agent for heavy metals and helps regulate ammonia formation, contributing to ammonia-free urine and reduced bladder irritation. Furthermore, it influences hair follicles and promotes hair growth, in addition to its potential protective effects against hepatotoxins like acetaminophen.

Pharmacokinetics

Methionine is absorbed from the gastrointestinal tract and is distributed throughout the body, where it is utilized in protein synthesis and converted into other metabolites, such as S-adenosylmethionine and L-cysteine. The metabolism of methionine involves several pathways, including transsulfuration to cysteine and incorporation into proteins. The renal clearance of methionine is significant, as it is involved in the regulation of nitrogen balance and the formation of ammonia.

Adverse effects

• Nausea
• Vomiting
• Abdominal pain
• Allergic reactions

Precautions

• Use with caution in patients with liver disease
• Monitor for allergic reactions in sensitive individuals

Pregnancy

There is insufficient evidence to determine the safety of methionine during pregnancy. Consult a healthcare provider before use.

Breast-feeding

It is not known whether methionine is excreted in human milk. Caution is advised when administering to breastfeeding women.

Storage

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

Formulations

• Oral tablets
• Powder for oral solution

Mechanism of action

Nicotinic compounds exert their effects by binding to nicotinic acetylcholine receptors in the nervous system. Agonists activate these receptors, leading to an influx of cations, primarily sodium (Na+) and calcium (Ca2+), which depolarizes the neuron and can initiate action potentials. This process facilitates neurotransmitter release and influences synaptic transmission, contributing to various effects such as increased alertness, improved cognitive function, and muscle contraction. Antagonists, on the other hand, block receptor activation, thereby inhibiting the normal effects of acetylcholine, which can be utilized therapeutically in conditions characterized by excessive cholinergic activity.

Pharmacodynamics

The pharmacodynamics of nicotinic compounds depend on their specific receptor subtype interactions and the tissue distribution of these receptors. In the central nervous system, activation of nAChRs can enhance dopaminergic transmission, which is crucial for reward and addiction pathways, making nicotinic compounds relevant for smoking cessation therapies. In the peripheral nervous system, nicotinic receptor activation at the neuromuscular junction leads to muscle contraction, while antagonism can result in muscle relaxation and is exploited in anesthesia. The overall effects can vary from stimulation to sedation based on the specific characteristics of the nicotinic agent and the receptor subtypes involved.

Pharmacokinetics

The pharmacokinetics of nicotinic compounds vary widely based on their chemical structure and route of administration. Generally, they are absorbed quickly from the gastrointestinal tract or through inhalation. Many nicotinic drugs undergo extensive first-pass metabolism, particularly when taken orally. The distribution can be wide, as many nicotinic agents cross the blood-brain barrier, influencing central nervous system effects. Metabolism typically occurs in the liver, and elimination can involve renal pathways, with half-l

Contra-indications

• Hypersensitivity to nicotine or any of the excipients
• Severe cardiovascular diseases
• Uncontrolled hypertension
• Recent myocardial infarction
• Pregnancy (in certain formulations)

Adverse effects

• Nausea
• Vomiting
• Dizziness
• Headache
• Insomnia
• Irritability
• Increased heart rate
• Hypertension
• Skin reactions

Interactions

• CYP1A2 inhibitors may increase nicotine levels
• CYP1A2 inducers may decrease nicotine levels
• Beta-blockers may have reduced effectiveness
• Other smoking cessation aids may have additive effects

Precautions

• Use with caution in patients with cardiovascular disease
• Monitor blood pressure regularly
• Assess for history of seizures
• Consider effects on insulin sensitivity in diabetic patients

Pregnancy

Nicotine use during pregnancy is contraindicated due to risks to fetal development, including low birth weight, preterm delivery, and increased risk of sudden infant death syndrome.

Breast-feeding

Nicotine can be excreted in breast milk; therefore, breastfeeding while using nicotine products should be approached with caution. It is recommended to use nicotine replacement therapy only if necessary.

Storage

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

Formulations

• Transdermal patches
• Gum
• Lozenges
• Inhalers
• Nasal spray

Indications

• Pantothenic acid deficiency
• Supportive treatment for adrenal insufficiency
• Supplementation in conditions of increased metabolic demand
• Potential use in improving energy metabolism

Dosage

Children: Refer to established guidelines for pediatric doses, which may vary based on age and dietary needs, generally aligning with recommended daily allowances.

Adults: Refer to established guidelines for supplementation and dietary intake, typically ranging from 5 to 10 mg daily for adults, depending on specific conditions and dietary intake.

Mechanism of action

Pantothenic acid is a precursor to coenzyme A, a cofactor necessary for the metabolism of fatty acids and carbohydrates. Coenzyme A is involved in the synthesis and oxidation of fatty acids, the metabolism of pyruvate in the citric acid cycle, and the synthesis of cholesterol and steroid hormones. By facilitating these metabolic pathways, pantothenic acid contributes to energy production and the biosynthesis of essential biomolecules.

Pharmacodynamics

Pantothenic acid is integral in the synthesis of coenzyme A, which plays a crucial role in the metabolism of carbohydrates, proteins, and fats. It aids in the conversion of food into energy and is also involved in the synthesis of neurotransmitters and hormones. Adequate levels of pantothenic acid are necessary for maintaining normal physiological functions and overall health.

Pharmacokinetics

Pantothenic acid is absorbed in the gastrointestinal tract and is widely distributed throughout body tissues. It is primarily excreted in the urine, with minimal storage in the body. The half-life of pantothenic acid in the body is relatively short, necessitating regular dietary intake to maintain adequate levels.

Adverse effects

• Diarrhea
• Nausea
• Abdominal cramping
• Fatigue
• Irritability

Precautions

• Use with caution in patients with known hypersensitivity to pantothenic acid or any component of the formulation.
• Monitor patients for gastrointestinal side effects.

Pregnancy

Pantothenic acid is generally considered safe during pregnancy, but it is important to consult a healthcare provider for individual assessment.

Breast-feeding

Pantothenic acid is secreted in breast milk; however, it is considered safe for breastfeeding mothers. Consultation with a healthcare provider is recommended.

Storage

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

Formulations

• Capsules
• Tablets
• Powder for oral solution
• Injectable form

Indications

• Vitamin deficiency syndromes (e.g., scurvy for vitamin C deficiency, rickets for vitamin D deficiency)
• Support for immune function
• Antioxidant support
• Bone health maintenance
• Vision health
• Energy metabolism support

Dosage

Children: Refer to the BNF for Children for specific vitamin dosing guidelines, which depend on age and nutritional requirements.

Adults: Refer to specific vitamin guidelines as dosage varies significantly depending on the type of vitamin and individual needs.

Mechanism of action

Vitamins function primarily as coenzymes or precursors for coenzymes in enzymatic reactions. For instance, B vitamins are involved in energy metabolism, while vitamins A, C, D, E, and K support various physiological functions including vision, antioxidant activity, calcium regulation, and blood clotting. Each vitamin has a unique mechanism of action based on its structure and role in the body.

Pharmacodynamics

Vitamins exert their effects at the cellular level, influencing metabolic pathways, gene expression, and immune responses. For example, vitamin D regulates calcium and phosphate homeostasis, while vitamin A is crucial for vision and immune function. Deficiencies in vitamins can lead to a range of disorders, highlighting their importance in maintaining health.

Pharmacokinetics

The pharmacokinetics of vitamins vary widely. Fat-soluble vitamins (A, D, E, and K) are stored in liver and adipose tissues and can be released into circulation as needed. Water-soluble vitamins (B-complex and C) are not stored and must be consumed regularly, with excess amounts excreted in urine. Absorption rates, half-lives, and distribution can also differ based on the specific vitamin and individual metabolic factors.

Interactions

• tretinoin+vitamin: Severe (increases risk of vitamin toxicity)
• retinoids+vitamin: Severe (increases risk of vitamin toxicity)
• retinoids+vitamin: Moderate (increases risk of toxicity)
• carbamazepine+vitamin: Unknown (decreases effects)
• cobicistat+vitamin: Unknown (increases exposure)
• vitamin D substances+digoxin: Unknown (increases risk of toxicity)
• idelalisib+vitamin: Unknown (increases exposure)
• clarithromycin+vitamin: Unknown (increases exposure)

Pregnancy

Consult healthcare professional before use. Vitamin supplementation during pregnancy should be carefully managed to avoid hypervitaminosis.

Breast-feeding

Consult healthcare professional before use. Some vitamins can pass into breast milk and may affect the infant.

Storage

Store in a cool, dry place, away from direct sunlight. Ensure it is kept out of reach of children.

Formulations

• {'name': 'Vitamin A', 'form': 'Capsule', 'strength': '10000 IU'}
• {'name': 'Vitamin D', 'form': 'Tablet', 'strength': '1000 IU'}
• {'name': 'Vitamin E', 'form': 'Softgel', 'strength': '400 IU'}

Mechanism of action

Iron is necessary for the production of hemoglobin. Iron-deficiency can lead to decreased production of hemoglobin and a microcytic, hypochromic anemia.

Pharmacodynamics

The major activity of supplemental iron is in the prevention and treatment of iron deficiency anemia. Iron has putative immune-enhancing, anticarcinogenic and cognition-enhancing activities.

Mechanism of action

Iron is necessary for the production of hemoglobin. Iron-deficiency can lead to decreased production of hemoglobin and a microcytic, hypochromic anemia.

Pharmacodynamics

The major activity of supplemental iron is in the prevention and treatment of iron deficiency anemia. Iron has putative immune-enhancing, anticarcinogenic and cognition-enhancing activities.

Mechanism of action

Glucose supplies most of the energy to all tissues by generating energy molecules ATP and NADH during a series of metabolism reactions called glycolysis. Glycolysis can be divided into two main phases where the preparatory phase is initiated by the phosphorylation of glucose by hexokinase to form glucose 6-phosphate. The addition of the high-energy phosphate group activates glucose for the subsequent breakdown in later steps of glycolysis and is the rate-limiting step. Products end up as substrates for following reactions, to ultimately convert C6 glucose molecule into two C3 sugar molecules. These products enter the energy-releasing phase where the total of 4ATP and 2NADH molecules are generated per one glucose molecule. The total aerobic metabolism of glucose can produce up to 36 ATP molecules. These energy-producing reactions of glucose are limited to D-glucose as L-glucose cannot be phosphorylated by hexokinase. Glucose can act as precursors to generate other biomolecules such as vitamin C. It plays a role as a signaling molecule to control glucose and energy homeostasis. Glucose can regulate gene transcription, enzyme activity, hormone secretion, and the activity of glucoregulatory neurons. The types, number, and kinetics of glucose transporters expressed depends on the tissues and fine-tunes glucose uptake, metabolism, and signal generation to preserve cellular and whole body metabolic integrity. Vascular calcification is a hallmark of type 2 diabetes. Glucose stimulates calcification in culture of vascular smooth muscle cells (VSMCs) but the underlying mechanisms remain obscure. We observed that high glucose levels stimulated mouse and human VSMC trans-differentiation into chondrocytes, with increased levels of Sox9, type II collagen, glycosaminoglycan and Runx2 expression, and increased alkaline phosphatase activity and mineralization. These effects were associated with increased expression of IL-1beta, which stimulated alkaline phosphatase and calcification, suggesting that glucose induces chondrocyte differentiation of VSMCs, possibly through IL-1beta activation.

Pharmacodynamics

Blood glucose is an obligatory energy source for humans involved in various cellular activities, and it also acts as a signaling molecule for diverse glucose-sensing molecules and proteins. Glucose undergoes oxidation into carbon dioxide, water, and yields energy molecules in the process of glycolysis and subsequent citric cycle and oxidative phosphorylation. Glucose is readily converted into fat in the body which can be used as a source of energy as required. Under a similar conversion into storage of energy, glucose is stored in the liver and muscles as glycogen. Glucose stores are mobilized in a regulated manner, depending on the tissues' metabolic demands. Oral glucose tablets or injections serve to increase the supply of glucose and oral glucose administration is more effective in stimulating insulin secretion because it stimulates the incretin hormones from the gut, which promotes insulin secretion.

Mechanism of action

Copper is absorbed from the gut via high affinity copper uptake protein and likely through low affinity copper uptake protein and natural resistance-associated macrophage protein-2. It is believed that copper is reduced to the Cu1+ form prior to transport. Once inside the enterocyte, it is bound to copper transport protein ATOX1 which shuttles the ion to copper transporting ATPase-1 on the golgi membrane which take up copper into the golgi apparatus. Once copper has been secreted by enterocytes into the systemic circulation it remain largely bound by ceruloplasmin (65-90%), albumin (18%), and alpha 2-macroglobulin (12%). Copper is an essential element in the body and is incorporated into many oxidase enzymes as a cofactor. It is also a component of zinc/copper super oxide dismutase, giving it an anti-oxidant role. Copper defiency occurs in Occipital Horn Syndrome and Menke's disease both of which are associated with impaired development of connective tissue due to the lack of copper to act as a cofactor in protein-lysine-6-oxidase. Menke's disease is also associated with progressive neurological impairment leading to death in infancy. The precise mechanisms of the effects of copper deficiency are vague due to the wide range of enzymes which use the ion as a cofactor. Copper appears to reduce the viabilty and motility of spermatozoa. This reduces the likelihood of fertilization with a copper IUD, producing copper's contraceptive effect. The exact mechanism of copper's effect on sperm are unknown. The reason for the less severe reaction when the foreign body is at a distance from the retina has been proposed to be ... that near the retina & its blood vessels there is greater oxygen tension than at a distance, which causes metallic copper to oxidize to toxic copper compounds more rapidly close to or in contact with the retina than at a distance. Furthermore, the abscess formation that is characteristic of copper undergoing oxidation close to the retina & choroiod can be attributed to attraction of polymorphonuclear leukocytes from these nearby vascular tissues, which become heavily infiltrated. Liquefaction & disorganization of the vitreous body has been explained on the basis of copper catalysis of oxidation of ascorbic acid, leading to depolymerization of the hyaluronic acid of the vitreous humor. Changes in protein & hexosamine content have also been related to decrease in viscosity of the vitreous humor. Increased content of amino acids in the vitreous humor has been consistent with proteolysis of the vitreous body, but decreased concentration in the aqueous humor has suggested suppression of secretion of amino acids by the ciliary body under the influence of copper.

Pharmacodynamics

Copper is incorporated into many enzymes throughout the body as an essential part of their function. Copper ions are known to reduce fertility when released from copper-containing IUDs.

Mechanism of action

The mechanism of the possible anti-hepatotoxic activity of L-methionine is not entirely clear. It is thought that metabolism of high doses of acetaminophen in the liver lead to decreased levels of hepatic glutathione and increased oxidative stress. L-methionine is a precursor to L-cysteine. L-cysteine itself may have antioxidant activity. L-cysteine is also a precursor to the antioxidant glutathione. Antioxidant activity of L-methionine and metabolites of L-methionine appear to account for its possible anti-hepatotoxic activity. Recent research suggests that methionine itself has free-radical scavenging activity by virtue of its sulfur, as well as its chelating ability. Amino acids are selected for protein synthesis by binding with transfer RNA (tRNA) in the cell cytoplasm. The information on the amino acid sequence of each individual protein is contained in the sequence of nucleotides in the messenger RNA (mRNA) molecules, which are synthesized in the nucleus from regions of DNA by the process of transcription. The mRNA molecules then interact with various tRNA molecules attached to specific amino acids in the cytoplasm to synthesize the specific protein by linking together individual amino acids; this process, known as translation, is regulated by amino acids (e.g., leucine), and hormones. Which specific proteins are expressed in any particular cell and the relative rates at which the different cellular proteins are synthesized, are determined by the relative abundances of the different mRNAs and the availability of specific tRNA-amino acid combinations, and hence by the rate of transcription and the stability of the messages. From a nutritional and metabolic point of view, it is important to recognize that protein synthesis is a continuing process that takes place in most cells of the body. In a steady state, when neither net growth nor protein loss is occurring, protein synthesis is balanced by an equal amount of protein degradation. The major consequence of inadequate protein intakes, or diets low or lacking in specific indispensable amino acids relative to other amino acids (often termed limiting amino acids), is a shift in this balance so that rates of synthesis of some body proteins decrease while protein degradation continues, thus providing an endogenous source of those amino acids most in need. /Protein synthesis/ The mechanism of intracellular protein degradation, by which protein is hydrolyzed to free amino acids, is more complex and is not as well characterized at the mechanistic level as that of synthesis. A wide variety of different enzymes that are capable of splitting peptide bonds are present in cells. However, the bulk of cellular proteolysis seems to be shared between two multienzyme systems: the lysosomal and proteasomal systems. The lysosome is a membrane-enclosed vesicle inside the cell that contains a variety of proteolytic enzymes and operates mostly at acid pH. Volumes of the cytoplasm are engulfed (autophagy) and are then subjected to the action of the protease enzymes at high concentration. This system is thought to be relatively unselective in most cases, although it can also degrade specific intracellular proteins. The system is highly regulated by hormones such as insulin and glucocorticoids, and by amino acids. The second system is the ATP-dependent ubiquitin-proteasome system, which is present in the cytoplasm. The first step is to join molecules of ubiquitin, a basic 76-amino acid peptide, to lysine residues in the target protein. Several enzymes are involved in this process, which selectively targets proteins for degradation by a second component, the proteasome. /Protein degradation/ Methionine dependence, the inability of cells to grow when the amino acid methionine is replaced in culture medium by its metabolic precursor homocysteine, is characteristic of many cancer cell lines and some tumors in situ. Most cell lines proliferate normally under these conditions. The methionine dependent t

Pharmacodynamics

L-Methionine is a principle supplier of sulfur which prevents disorders of the hair, skin and nails; helps lower cholesterol levels by increasing the liver's production of lecithin; reduces liver fat and protects the kidneys; a natural chelating agent for heavy metals; regulates the formation of ammonia and creates ammonia-free urine which reduces bladder irritation; influences hair follicles and promotes hair growth. L-methionine may protect against the toxic effects of hepatotoxins, such as acetaminophen. Methionine may have antioxidant activity.