Solvent for Docetaxel Injection

Indications

• Skin disinfection
• Preparation of skin before injections
• Cleansing minor wounds

Dosage

Children: Apply to the skin as required; consult product literature for specific guidance.

Adults: Apply to the skin as required for disinfection.

Mechanism of action

Alcohol exerts its antiseptic effect by denaturing proteins, disrupting cell membranes, and dehydrating microbial cells, leading to cell lysis and death.

Pharmacodynamics

Alcohol has broad-spectrum antimicrobial activity, effective against bacteria, fungi, and viruses. Its efficacy is influenced by concentration, with higher concentrations generally being more effective.

Pharmacokinetics

Alcohol is rapidly absorbed through the skin and mucous membranes. It is metabolized primarily in the liver, with a half-life that varies based on the individual's metabolic rate and the amount consumed.

Contra-indications

• Concomitant use with lithium
• Regular use in neonates
• Patients with severe burns when diathermy has been preceded by application of alcoholic skin disinfectants

Adverse effects

• Eye erythema
• Punctate keratitis
• Cytotoxicity
• Eye discolouration

Interactions

• Increases risk of visual disturbances with antiepileptics
• Increases concentration with methylphenidate
• Increases risk of facial flushing and skin irritation with topical pimecrolimus
• Increases concentration with retinoids
• Increases concentration with acitretin
• Increases risk of facial flushing and skin irritation with topical tacrolimus
• Decreases antidiuretic effect with vasopressin

Precautions

• Avoid regular application to inflamed or broken skin or mucosa
• Avoid broken skin
• Flammable

Pregnancy

Sufficient iodine may be absorbed to affect the fetal thyroid in the second and third trimester.

Breast-feeding

Avoid regular or excessive use.

Storage

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

Formulations

• Betadine 2.5% dry powder spray
• Industrial methylated spirit
• Povidone-Iodine 25 mg per 1 gram

Indications

• Adjuvant treatment of operable node-positive and operable node-negative breast cancer (in combination with doxorubicin and cyclophosphamide)
• Initial chemotherapy of metastatic breast cancer which overexpresses HER2 (in combination with trastuzumab and pertuzumab)
• Treatment of hormone-refractory metastatic prostate cancer (in combination with prednisone or prednisolone)
• Initial chemotherapy of unresectable, locally advanced or metastatic non-small cell lung cancer (with cisplatin)
• Induction treatment of locally advanced squamous cell carcinoma of the head and neck (with cisplatin and fluorouracil)
• Treatment of metastatic gastric adenocarcinoma (with cisplatin and fluorouracil)

Mechanism of action

Docetaxel binds to the beta-subunit of tubulin, promoting the assembly of microtubules while preventing their disassembly. This hyper-stabilization disrupts the dynamic instability required for normal cellular functions, particularly mitosis, leading to the formation of dysfunctional microtubule bundles and ultimately causing programmed cell death (apoptosis) in cancer cells.

Pharmacodynamics

As an antineoplastic agent, docetaxel enhances microtubule stability, inhibiting the normal reorganization necessary for cell cycle progression and mitotic functions. This results in the accumulation of abnormal microtubule structures, contributing to cell cycle arrest and apoptosis. Docetaxel's use is associated with several potential adverse effects, including hematologic toxicity, hypersensitivity reactions, and fluid retention.

Pharmacokinetics

Docetaxel is administered via intravenous infusion and has a variable pharmacokinetic profile affected by hepatic function. It is metabolized primarily by the liver through CYP3A4 enzymes, and the elimination half-life is approximately 36 hours. Drug interactions, particularly with agents that affect CYP3A4, can significantly alter docetaxel exposure.

Contra-indications

• Severe hypersensitivity to docetaxel or any component of the formulation
• Severe hepatic impairment
• Acute porphyrias

Adverse effects

• Abdominal pain
• Alopecia
• Anaemia
• Appetite decreased
• Arrhythmia
• Asthenia
• Constipation
• Diarrhoea
• Dyspnoea
• Fluid imbalance
• Haemorrhage
• Hypersensitivity reactions
• Hypertension
• Hypotension
• Increased risk of infection
• Myalgia
• Nausea
• Neutropenia
• Pain
• Peripheral neuropathy
• Sepsis
• Skin reactions
• Stomatitis
• Taste altered
• Thrombocytopenia
• Vomiting
• Gastrointestinal disorders
• Heart failure
• Ascites
• Bone marrow depression
• Chest tightness
• Chills
• Cutaneous lupus erythematosus
• Disseminated intravascular coagulation
• Eye disorders
• Eye inflammation
• Fever
• Hearing impairment
• Hepatitis
• Hyponatraemia
• Loss of consciousness
• Multi-organ failure
• Myocardial infarction
• Nail discolouration
• Neurotoxicity

Interactions

• Pitolisant (severe, decreases exposure)
• Miconazole (moderate, increases concentration)
• Berotralstat (moderate, increases concentration)
• Cobicistat (moderate, increases exposure)
• Idelalisib (moderate, increases exposure)
• Clarithromycin (moderate, increases exposure)
• Sotorasib (moderate, increases exposure)
• Tucatinib (moderate, increases exposure)
• Dronedarone (unknown, increases exposure)
• Amiodarone (unknown, increases exposure)

Precautions

• Monitor liver function in hepatic impairment
• Risk of severe hematologic effects
• Risk of hypersensitivity reactions

Indications

• Acidulant in food and beverages
• Preservative in pharmaceutical formulations
• pH adjuster in various chemical preparations

Dosage

Children: Refer to product-specific guidelines for appropriate dosing based on formulation and indication.

Adults: Refer to product-specific guidelines for appropriate dosing based on formulation and indication.

Mechanism of action

Citric acid acts by chelating metal ions, which can enhance the solubility of certain compounds and improve their bioavailability. It also contributes to the acidity of the environment, which can influence enzymatic activity and metabolic pathways, particularly in the degradation of citronellol.

Pharmacodynamics

Citric acid exhibits mild pharmacological effects primarily attributed to its role in metabolic processes. It aids in the regulation of pH levels, which can impact enzymatic reactions and biochemical pathways. The acid's chelating properties may help to reduce the toxicity of certain metal ions in biological systems.

Pharmacokinetics

Citric acid is rapidly absorbed after oral administration and is metabolized in the liver. It undergoes conversion to various metabolites in the citric acid cycle, contributing to energy production. The elimination primarily occurs through urine, with minimal accumulation in the body.

Pregnancy

Citric acid is generally regarded as safe during pregnancy when used in food amounts. However, consult a healthcare provider for advice on medicinal use.

Breast-feeding

Citric acid is considered safe during breastfeeding when consumed in food amounts. For medicinal use, consult a healthcare provider.

Storage

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

Indications

• Mild to moderate dehydration
• Severe dehydration
• Electrolyte imbalances
• Diarrhea and vomiting
• Heat-related illnesses

Dosage

Children: Pediatric doses for rehydration should be guided by the severity of dehydration and the specific recommendations found in the BNF for Children. Generally, oral rehydration solutions are recommended, with adjustments based on age and weight.

Adults: The dosage for adults typically involves oral rehydration solutions containing specific electrolyte concentrations. For severe cases, intravenous fluids may be administered under medical supervision, with the type and rate depending on clinical evaluation.

Mechanism of action

Rehydration therapies work primarily by restoring fluid balance and supplying necessary electrolytes, such as sodium and potassium, to the body. Oral rehydration solutions contain specific concentrations of salts and sugars that enhance water absorption in the intestines, promoting faster recovery from dehydration.

Pharmacodynamics

The pharmacodynamic effects of rehydration solutions are primarily to correct fluid and electrolyte imbalances. By providing an appropriate osmotic gradient, these solutions facilitate the absorption of water and electrolytes from the gastrointestinal tract into the bloodstream, thus replenishing lost fluids and restoring normal physiological function.

Pharmacokinetics

The pharmacokinetics of rehydration solutions depend on their composition. Oral rehydration solutions are rapidly absorbed in the intestines, with peak plasma concentrations of electrolytes generally achieved within 1 to 2 hours after administration. Intravenous fluids can have immediate effects, restoring intravascular volume and improving circulation almost instantly, depending on the type and rate of infusion.

Pregnancy

Dehydration can pose risks during pregnancy, including reduced amniotic fluid and impaired fetal development. Proper hydration is essential.

Breast-feeding

Maintaining hydration is crucial for breastfeeding mothers, as dehydration can affect milk production.

Storage

Dehydrated substances should be stored in a cool, dry place, away from moisture to prevent rehydration.

Indications

• Emulsifying agent in drug formulations
• Stabilizer for parenteral preparations
• Solubilizer for hydrophobic drug compounds
• Ingredient in topical formulations

Dosage

Children: Refer to specific product guidelines, as dosing varies based on formulation and intended use.

Adults: Refer to specific product guidelines, as dosing varies based on formulation and intended use.

Mechanism of action

Polysorbate functions primarily as an emulsifying agent. It reduces the surface tension between immiscible liquids, allowing them to mix more easily. This property is particularly useful in stabilizing emulsions and suspensions, facilitating the delivery of active pharmaceutical ingredients in various formulations.

Pharmacodynamics

Polysorbate does not exert pharmacological effects in the traditional sense, as it does not bind to specific receptors to elicit a physiological response. Instead, it plays a crucial role in modifying the physical properties of drug formulations, thereby enhancing drug delivery and absorption. Its ability to solubilize drugs enhances their bioavailability, particularly for poorly soluble compounds.

Pharmacokinetics

Polysorbate is generally considered to be non-toxic and is not absorbed to a significant extent when administered orally. It is metabolized by the liver and excreted primarily through the gastrointestinal tract. The pharmacokinetic profile may vary depending on the route of administration and the specific formulation in which it is used.

Adverse effects

• Allergic reactions
• Skin irritation
• Gastrointestinal disturbances

Precautions

• Use cautiously in patients with known allergies to polysorbates or related compounds
• Monitor for allergic reactions in susceptible individuals

Pregnancy

Polysorbate is generally considered safe for use during pregnancy, but consult with a healthcare provider for specific cases.

Breast-feeding

Polysorbate is considered safe during breastfeeding, but consult with a healthcare provider for individual advice.

Storage

Store at room temperature, away from direct sunlight and moisture.

Formulations

• Polysorbate 20
• Polysorbate 80

Mechanism of action

Ethanol affects the brain’s neurons in several ways. It alters their membranes as well as their ion channels, enzymes, and receptors. Alcohol also binds directly to the receptors for acetylcholine, serotonin, GABA, and the NMDA receptors for glutamate. The sedative effects of ethanol are mediated through binding to GABA receptors and glycine receptors (alpha 1 and alpha 2 subunits). It also inhibits NMDA receptor functioning. In its role as an anti-infective, ethanol acts as an osmolyte or dehydrating agent that disrupts the osmotic balance across cell membranes. ... Ethanol is known to affect a large number of membrane proteins that participate in signaling pathways such as neurotransmitter receptors, enzymes, and ion channels, and there is extensive evidence that ethanol interacts with a variety of neurotransmitters. The major actions of ethanol involve enhancing the inhibitory effects of gamma-aminobutyric acid (GABA) at GABAa receptors and blockade of the N-methyl-D-aspartate (NMDA) subtype of glutamate, an excitatory amine acid (EAA) receptor. Animal studies indicate that the acute effects of ethanol result from competitive inhibition of glycine binding to NMDA receptor and disruption of glutamatergic neurotransmission by inhibiting the response of the NMDA receptor. Persistent glycine antagonism and attenuation of glutamatergic neurotransmission by chronic ethanol exposure results in tolerance to ethanol by enhancing EAA neurotransmission and NMDA receptor upregulation. The latter appears to involve selective increases in NMDA R2B subunit concentrations and other molecular changes in specific brain loci. The abrupt withdrawal of ethanol thus produces a hyperexcitable state that leads to the ethanol withdrawal syndrome and excitotoxic neuronal death. GABA-mediated inhibition, which normally acts to limit excitation, is eliminated during ethanol withdrawal syndrome and further intensifies this excitation. In addition, NMDA receptors function to inhibit the release of dopamine in the nucleus accumbens and mesolimbic structures, which modulate the reinforcing action of addictive xenobiotics such as ethanol. By inhibiting NMDA receptor activity, ethanol could increase dopamine release from the nucleus accumbens and ventral tegmental area and could thus create dependence. Chronic ethanol administration also results in tolerance, dependence, and an ethanol withdrawal syndrome, mediated, in part, by desensitization and or downregulation of GABAa receptors. The development of alcoholic ketoacidosis (AKA) requires that a combination of physical and physiologic events occur. The normal response to starvation and depletion of hepatic glycogen stores is for amino acids to be converted to pyruvate. Pyruvate can serve as a substrate for gluconeogenesis, be converted to acetyl-CoA, which can enter the Krebs cycle or can be utilized in various biosynthetic pathways (eg, fatty acid, ketone bodies, cholesterol, and acetylcholine) ... Ethanol metabolism generates NADH, resulting in an excess of reducing potential. This high redox state favors the conversion of pyruvate to lactate, diverting pyruvate from being a substrate for gluconeogenesis. To compensate for the lack of normal metabolic substrates, the body mobilizes fat from adipose tissue and increased fatty acid metabolism as an alternative source of energy. This response is mediated by a decrease in insulin and an increased secretion of glucagon, catecholamines, growth hormone, and cortisol. Fatty acid metabolism results in the formation of acetyl-CoA and it combines with the excess acetate that is generated from ethanol metabolism to form acetoacetate. Most of the acetoacetate is reduced to beta-hydroxybutyrate due to the excess reducing potential or high redox state of the cell. Volume depletion interferes with the renal elimination of acetoacetate and beta-hydroxybutyrate, and contributes to the acidosis. An elevated lactate concentration may result from shunting from pyruvate or

Pharmacodynamics

Alcohol produces injury to cells by dehydration and precipitation of the cytoplasm or protoplasm. This accounts for its bacteriocidal and antifungal action. When alcohol is injected in close proximity to nerve tissues, it produces neuritis and nerve degeneration (neurolysis). Ninety to 98% of ethanol that enters the body is completely oxidized. Ethanol is also used as a cosolvent to dissolve many insoluble drugs and to serve as a mild sedative in some medicinal formulations. Ethanol also binds to GABA, glycine, NMDA receptors and modulates their effects. Ethanol is also metabolised by the hepatic enzyme alcohol dehydrogenase.

Mechanism of action

Docetaxel interferes with the normal function of microtubule growth. Whereas drugs like [colchicine] cause the depolymerization of microtubules in vivo, docetaxel arrests their function by having the opposite effect; it hyper-stabilizes their structure. This destroys the cell's ability to use its cytoskeleton in a flexible manner. Specifically, docetaxel binds to the β-subunit of tubulin. Tubulin is the "building block" of microtubules, and the binding of docetaxel locks these building blocks in place. The resulting microtubule/docetaxel complex does not have the ability to disassemble. This adversely affects cell function because the shortening and lengthening of microtubules (termed dynamic instability) is necessary for their function as a transportation highway for the cell. Chromosomes, for example, rely upon this property of microtubules during mitosis. Further research has indicated that docetaxel induces programmed cell death (apoptosis) in cancer cells by binding to an apoptosis-stopping protein called Bcl-2 (B-cell leukemia 2), thus arresting its function. Docetaxel is an antineoplastic agent that acts by disrupting the microtubular network in cells that is essential for mitotic and interphase cellular functions. Docetaxel binds to free tubulin and promotes the assembly of tubulin into stable microtubules while simultaneously inhibiting their disassembly. This leads to the production of microtubule bundles without normal function and to the stabilization of microtubules, which results in the inhibition of mitosis in cells. Docetaxel's binding to microtubules does not alter the number of protofilaments in the bound microtubules, a feature which differs from most spindle poisons currently in clinical use. Docetaxel, a semisynthetic taxane, has exhibited significant single-agent activity against prostatic tumors. In phase I/II studies, single-agent docetaxel and the combination of docetaxel plus estramustine were effective in inducing prostate-specific antigen reductions of > or = 50% in men with androgen-independent prostate cancer (AIPC). The underlying reason for docetaxel's clinical activity against prostate cancer has been a focus of ongoing research. Docetaxel is believed to have a twofold mechanism of antineoplastic activity: (1) inhibition of microtubular depolymerization, and (2) attenuation of the effects of bcl-2 and bcl-xL gene expression. Taxane-induced microtubule stabilization arrests cells in the G(2)M phase of the cell cycle and induces bcl-2 phosphorylation, thereby promoting a cascade of events that ultimately leads to apoptotic cell death. In preclinical studies, docetaxel had a higher affinity for tubulin and was shown to be a more potent inducer of bcl-2 phosphorylation than paclitaxel. Laboratory evidence also supports the clinical evaluation of docetaxel-based combinations that include agents such as trastuzumab and/or estramustine. The pathways for docetaxel-induced apoptosis appear to differ in androgen-dependent and androgen-independent prostate cancer cells. Further elucidation of these differences will be instrumental in designing targeted regimens for the treatment of localized and advanced prostate cancer.

Pharmacodynamics

Docetaxel is a taxoid antineoplastic agent. It promotes the assembly of microtubules from tubulin dimers and stabilizes microtubules by preventing depolymerization. This stability results in the inhibition of the normal dynamic reorganization of the microtubule network which is essential for vital interphase and mitotic cellular functions. In addition, docetaxel induces abnormal arrays or "bundles" of microtubules throughout the cell cycle and multiple asters of microtubules during mitosis. The use of docetaxel may lead to treatment-related deaths in breast cancer and non-small cell lung cancer patients, hepatic impairment, hematologic effects, enterocolitis and neutropenic colitis, hypersensitivity reactions, fluid retention, second primary malignancies, cutaneous reactions, neurologic reactions, eye disorders, asthenia, embryo-fetal toxicity, and tumor lysis syndrome.