ITCHI ITCHI

Indications

• Food preservative
• Treatment of urea cycle disorders
• Metabolic disorders involving benzoyl-CoA

Dosage

Children: Refer to the BNF for Children for specific dosing guidelines based on condition.

Adults: Refer to the BNF for specific dosing guidelines based on condition.

Mechanism of action

Benzoate acts mainly by inhibiting the growth of bacteria and fungi through its ability to lower the pH, creating an environment that is less favorable for microbial growth. It is also involved in metabolic pathways where it helps in the conjugation of toxic substances, facilitating their excretion from the body.

Pharmacodynamics

Benzoate is known for its antimicrobial properties, which are particularly effective against a wide range of fungi and bacteria. Its efficacy as a preservative is due to its ability to penetrate microbial cell membranes and disrupt their metabolic processes. Additionally, it has been observed to modulate various metabolic pathways, particularly those associated with aromatic compound degradation.

Pharmacokinetics

After ingestion, benzoate is rapidly absorbed in the gastrointestinal tract. It is metabolized primarily in the liver, where it undergoes conjugation with glycine to form hippurate, which is then excreted in the urine. The half-life of benzoate varies depending on individual metabolic rates but is generally short due to its efficient conversion and excretion.

Pregnancy

There is limited data on the use of benzoate in pregnancy. Consultation with healthcare professionals is advised before use.

Breast-feeding

Limited data is available on the excretion of benzoate in breast milk. Caution is recommended when administering to nursing mothers.

Storage

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

Indications

• Bacterial infections
• Pneumonia
• Meningitis
• Syphilis
• Endocarditis
• Skin and soft tissue infections

Dosage

Children: Paediatric dosing for benzylpenicillin is determined by the child's weight and the severity of the infection. Refer to the BNF for Children for specific dosing guidelines.

Adults: The usual adult dose for benzylpenicillin varies based on the type and severity of the infection. It is generally administered via intramuscular or intravenous routes. For severe infections, doses may range from 1 to 4 million units every 4 to 6 hours.

Mechanism of action

Benzylpenicillin exerts its antibacterial effects by inhibiting the synthesis of bacterial cell walls. It binds to penicillin-binding proteins (PBPs) located inside the bacterial cell wall, disrupting the transpeptidation process, which is crucial for cross-linking peptidoglycan layers. This inhibition leads to cell lysis and death of the bacteria.

Pharmacodynamics

Benzylpenicillin demonstrates time-dependent bactericidal activity, meaning its effectiveness is related to the duration of time the drug concentration remains above the minimum inhibitory concentration (MIC) for the target bacteria. It has a narrow spectrum of activity, primarily targeting Gram-positive cocci and some Gram-negative rods.

Pharmacokinetics

Benzylpenicillin is typically administered parenterally due to poor oral absorption. It is rapidly distributed throughout the body and can penetrate various tissues, including the central nervous system during inflammation. The drug is primarily eliminated by renal excretion, with a half-life of approximately 30 minutes to 1 hour in healthy individuals. Dosage adjustments may be necessary in patients with renal impairment.

Interactions

• leflunomide+benzylpenicillin: Unknown (increases exposure)
• nitisinone+benzylpenicillin: Unknown (increases exposure)
• teriflunomide+benzylpenicillin: Unknown (increases exposure)

Pregnancy

Benzylpenicillin is generally considered safe to use during pregnancy, as it is a penicillin antibiotic and has a long history of use.

Breast-feeding

Benzylpenicillin is excreted in breast milk in small amounts, but it is not expected to have adverse effects on a nursing infant.

Storage

Store in a cool, dry place, protected from light. Reconstituted solutions should be used promptly or stored in a refrigerator and used within a limited time frame.

Formulations

• Benzylpenicillin injection

Indications

• Stabilization of emulsions in pharmaceutical formulations
• Improvement of drug solubility and bioavailability
• Enhancement of texture and stability in food products
• Use in topical formulations for skin hydration

Dosage

Children: Refer to specific product guidelines or consult the manufacturer's information for recommended dosage, as emulsifying agents are often used as excipients rather than active pharmacological agents.

Adults: Refer to specific product guidelines or consult the manufacturer's information for recommended dosage, as emulsifying agents are often used as excipients rather than active pharmacological agents.

Mechanism of action

Emulsifying agents function by accumulating at the interface of the dispersed and continuous phases of an emulsion. They possess both hydrophilic (water-attracting) and hydrophobic (water-repelling) properties, which allows them to stabilize the emulsion by forming a protective barrier around the droplets of one liquid phase, preventing coalescence. This mechanism is crucial for maintaining the stability and homogeneity of the emulsified mixture.

Pharmacodynamics

The pharmacodynamic properties of emulsifying agents are largely related to their ability to stabilize emulsions and enhance the delivery of active pharmaceutical ingredients. By improving the solubility of hydrophobic compounds in aqueous environments, emulsifiers can enhance the bioavailability of certain drugs. Their action can also modify the release profiles of drugs from emulsified formulations.

Pharmacokinetics

The pharmacokinetics of emulsifying agents depend on their chemical structure, molecular weight, and the formulation in which they are used. Generally, emulsifiers are not absorbed systemically when used in pharmaceutical preparations; rather, they act locally at the site of application or in the gastrointestinal tract. The metabolism and excretion of emulsifying agents can vary, but many are excreted unchanged in the feces.

Adverse effects

• Gastrointestinal discomfort
• Nausea
• Diarrhea

Precautions

• Use with caution in patients with known allergies to emulsifiers or similar compounds
• Monitor for gastrointestinal symptoms in patients with pre-existing gastrointestinal disorders

Pregnancy

Emulsifiers are generally considered safe for use during pregnancy, but caution is advised. Consult healthcare professionals for individual assessment.

Breast-feeding

Emulsifiers are typically regarded as safe during breastfeeding, yet it is recommended to consult healthcare professionals for personalized advice.

Storage

Store in a cool, dry place away from direct sunlight. Ensure the container is tightly closed to prevent moisture absorption.

Formulations

• Liquid emulsions
• Creams and lotions
• Powdered emulsifiers