Virocid

Indications

• Warts, particularly plantar warts
• Condylomata acuminata affecting the penis or female external genitalia
• Sterilization of medical instruments

Dosage

Children: For children aged 2–17 years (initiated under specialist supervision), apply twice daily for 3 consecutive days. Treatment may be repeated at weekly intervals if necessary for a total of four 3-day courses.

Adults: Apply twice daily to the lesion for up to 3 applications, ensuring to remove dead skin before use. Treatment may be repeated weekly if necessary.

Mechanism of action

Glutaraldehyde functions primarily by cross-linking with proteins and nucleic acids, leading to microbial cell death. This cross-linking interferes with the normal functioning of cellular components, thereby disrupting metabolism and replication in bacteria, viruses, and fungi.

Pharmacodynamics

The pharmacodynamic profile of glutaraldehyde is characterized by its rapid action as a broad-spectrum antimicrobial agent. It exhibits bactericidal, virucidal, and fungicidal properties, making it effective against a wide range of pathogens, including resistant strains. Its activity is influenced by concentration, exposure time, and pH levels, with higher concentrations and longer exposure times enhancing its antimicrobial effects.

Pharmacokinetics

Glutaraldehyde is primarily used topically and does not have significant systemic absorption when applied appropriately. It is rapidly metabolized and eliminated from the body. The exact pharmacokinetic parameters, such as half-life or volume of distribution, are not well characterized due to its topical use and rapid inactivation upon contact with tissues.

Contra-indications

• Not for application to anogenital areas
• Not for application to the face
• Not for application to mucosa
• Avoid broken skin

Adverse effects

• Skin irritation
• Rash
• Balanoposthitis
• Severe cutaneous adverse reactions
• Argyria
• Methaemoglobinaemia

Precautions

• Avoid application to normal skin
• Avoid open wounds
• Keep away from eyes
• Use under specialist supervision for children

Pregnancy

Avoid use during pregnancy.

Breast-feeding

Avoid use during breastfeeding.

Storage

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

Formulations

• Warticon 0.5% solution
• Glutaraldehyde liquid

Indications

• Nitrogen supplementation in clinical nutrition
• Management of metabolic alkalosis
• Treatment of certain types of kidney disorders

Dosage

Children: Specific pediatric dosing information is not detailed in the BNF. Refer to the BNF for Children for appropriate dosing based on age and condition.

Adults: Dosage varies based on clinical indication and should be guided by specific treatment protocols. Refer to clinical guidelines for detailed dosing information.

Mechanism of action

Ammonium ions participate in various metabolic pathways, including the biosynthesis of amino acids and nucleotides. It serves as a nitrogen source for organisms, facilitating the synthesis of essential biomolecules. The presence of ammonium can influence pH levels and osmotic balance within cells, thereby affecting cellular functions and enzyme activities.

Pharmacodynamics

Ammonium affects cellular metabolism by acting as a nitrogen donor in the synthesis of organic compounds. Its role in the nitrogen cycle and as a substrate in biochemical pathways allows for the maintenance of cellular functions, including energy production and cellular growth. Alterations in ammonium levels can influence various physiological processes, including neurotransmitter synthesis and energy metabolism.

Pharmacokinetics

Ammonium is readily absorbed and distributed in biological systems. It can be produced endogenously through amino acid metabolism or obtained from dietary sources. The excretion of ammonium primarily occurs through the kidneys, where it is converted to urea for elimination. Ammonium levels are regulated by various mechanisms, including the action of renal tubular cells that either secrete or reabsorb ammonium based on the body's needs.

Indications

• Cough associated with respiratory tract infections
• Acid-base disorders
• Edema management

Dosage

Children: Refer to the BNF for Children for appropriate paediatric dosing guidelines based on age and condition.

Adults: Refer to the BNF for specific adult dosing guidelines as they depend on the indication and clinical context.

Mechanism of action

Ammonium chloride increases acidity by raising hydrogen ion concentrations. It dissociates into ammonium and chloride ions; the ammonium is converted to urea in the liver, releasing hydrogen ions that lower pH. The chloride ions displace bicarbonate in extracellular fluid, leading to acidosis and increased renal excretion of electrolytes and water, resulting in fluid mobilization.

Pharmacodynamics

Ammonium chloride acts as a systemic acidifier, facilitating the excretion of chloride and sodium, while also increasing the acidity of body fluids. The conversion of ammonium to urea in the liver with the release of hydrogen ions contributes to a decrease in blood pH, affecting acid-base balance in the body.

Pharmacokinetics

Ammonium chloride is absorbed from the gastrointestinal tract and metabolized in the liver, where it is converted to urea. The dissociated ions impact renal function, leading to increased excretion of sodium, potassium, and water. The elimination half-life and specific metabolism details are not explicitly defined.

Adverse effects

• Nausea
• Vomiting
• Abdominal pain
• Diarrhea
• Dizziness
• Headache

Interactions

• Antacids may reduce the effectiveness of ammonium chloride
• Potassium-sparing diuretics may increase the risk of hyperkalemia

Precautions

• Use with caution in patients with renal impairment
• Monitor electrolyte levels during prolonged therapy
• Consider potential for acidosis in patients with liver disease

Pregnancy

Ammonium chloride should only be used during pregnancy if the potential benefit justifies the potential risk to the fetus. Consult a healthcare provider for individualized advice.

Breast-feeding

Ammonium chloride is excreted in breast milk. Use caution and consult a healthcare provider if breastfeeding.

Storage

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

Formulations

• Oral solution
• Powder for oral solution

Indications

• Disinfection of surfaces
• Antiseptic for skin and mucous membranes
• Sanitization in healthcare settings
• Use in personal care products

Dosage

Children: For paediatric use, consult BNF for Children for appropriate guidance on formulations and dosages.

Adults: For topical use, apply as directed on the product label. Refer to BNF for specific formulations and concentrations.

Mechanism of action

Didecyldimethylammonium acts primarily by disrupting the lipid bilayer of microbial cell membranes, leading to cell lysis and death. It interacts with negatively charged phospholipids, causing structural damage to the cell membrane, which results in the leakage of cellular contents.

Pharmacodynamics

The pharmacodynamics of didecyldimethylammonium involve its cationic nature, which allows it to bind to negatively charged sites on the microbial surface. This binding alters the permeability of the cell membrane, ultimately leading to the loss of essential intracellular components and cell death. Its effectiveness varies with concentration, contact time, and the type of microorganism.

Pharmacokinetics

Didecyldimethylammonium is typically applied topically and does not undergo significant systemic absorption, which limits its pharmacokinetic profile to local effects. Its persistence on surfaces contributes to its prolonged antimicrobial action. The compound is usually inactivated by organic matter, which can affect its efficacy.

Pregnancy

There are no available data regarding the use of didecyldimethylammonium during pregnancy. Caution is recommended.

Breast-feeding

There is limited information on the excretion of didecyldimethylammonium in human milk. Caution is advised.

Storage

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

Formulations

• {'formulation': 'Topical solution', 'concentration': '0.1%'}
• {'formulation': 'Disinfectant', 'concentration': 'Various formulations available'}

Indications

• Disinfection of surfaces and instruments in healthcare settings
• Antiseptic for skin and mucous membranes
• Preservatives in pharmaceutical formulations
• Cleansing agents in personal care products

Dosage

Children: Refer to the specific product guidelines for dosing, as it varies by formulation and intended use.

Adults: Refer to the specific product guidelines for dosing, as it varies by formulation and intended use.

Mechanism of action

Quaternary ammonium compounds exert their antimicrobial effect by binding to the negatively charged surfaces of microorganisms. This leads to disruption of the cell membrane integrity, resulting in leakage of cellular contents and ultimately cell death. They can also inactivate enzymes and denature proteins within the cell, further contributing to their antimicrobial efficacy.

Pharmacodynamics

Quaternary ammonium compounds exhibit bactericidal activity against a wide range of Gram-positive and Gram-negative bacteria, as well as some fungi and viruses. Their effectiveness can vary based on the concentration of the compound, the contact time, and the presence of organic matter. Resistance to quaternary ammonium compounds is relatively rare, but can occur through modifications in the microbial cell membrane.

Pharmacokinetics

The pharmacokinetic profile of quaternary ammonium compounds varies widely depending on the specific compound and its formulation. Generally, they are poorly absorbed through the gastrointestinal tract when ingested, and their systemic absorption through skin is minimal. They primarily exert their effects locally and are rapidly inactivated by organic matter. Metabolism and excretion details differ among specific quaternary compounds, with many being excreted unchanged in urine.

Pregnancy

Quaternary compounds should be used with caution during pregnancy, and only if the potential benefit justifies the potential risk to the fetus.

Breast-feeding

Use of quaternary compounds during breastfeeding should be approached with caution, as it is unclear if they are excreted in human milk.

Storage

Store in a cool, dry place away from direct sunlight. Ensure the container is tightly closed to maintain stability.

Mechanism of action

Ammonium chloride increases acidity by increasing the amount of hydrogen ion concentrations. Ammonium chloride can be used as an expectorant due to its irritative action on the bronchial mucosa. This effect causes the production of respiratory tract fluid which in order facilitates the effective cough. The acid-forming properties of ammonium chloride result from dissociation of the salt to an ammonium cation and a chloride anion. In patients with normal hepatic function, the ammonium cation is converted to urea by the liver and a hydrogen cation is released which reacts with a bicarbonate ion to form water and carbon dioxide. The chloride anion combines with fixed bases in the extracellular fluid, thereby reducing the alkaline reserve of the body. The net result is the displacement of bicarbonate ions by chloride anions. The displacement of bicarbonate by chloride alters the bicarbonate:carbonic acid ratio if the body and acidosis results. The increased chloride concentration in the extracellular fluid produces an increased load to the renal tubules and appreciable amounts of chloride anions escape reabsorption. These anions are excreted along with cations and water. Sodium is the principal cation excreted; however, potassium excretion may also be increased to some degree. By increasing the excretion of both extracellular electrolytes and water, ammonium chloride causes a net loss of extracellular fluid and promotes the mobilization of edema fluid.

Pharmacodynamics

Systemic acidifier. In liver ammonium chloride is converted into urea with the liberation of hydrogen ions ( which lowers the pH) and chloride.