Savlon Antiseptic Liquid

Indications

• Topical antiseptic for wound care
• Disinfection of skin and mucous membranes
• Cleaning and preparation of the skin prior to surgery
• Management of minor cuts, abrasions, and burns

Dosage

Children: Refer to specific product guidelines for concentration and application frequency, as doses may vary based on formulation.

Adults: Refer to specific product guidelines for concentration and application frequency, as doses may vary based on formulation.

Mechanism of action

Cetrimide works by disrupting the cell membrane of microorganisms, leading to cell lysis and death. It is a surfactant that decreases surface tension and facilitates the penetration of the antiseptic into the microbial cell wall, ultimately causing cell disruption. This mechanism contributes to its broad-spectrum antimicrobial efficacy.

Pharmacodynamics

Cetrimide exhibits bactericidal and fungicidal activity. It is particularly effective against Gram-positive bacteria, with variable activity against Gram-negative organisms. Its surfactant properties enhance its ability to cleanse and disinfect wounds, reducing the risk of infection. Cetrimide's effectiveness is influenced by concentration, contact time, and the presence of organic matter.

Pharmacokinetics

When applied topically, cetrimide is minimally absorbed into systemic circulation, resulting in localized action at the site of application. Its distribution is primarily limited to the skin and mucous membranes. The metabolism and excretion pathways of cetrimide are not well characterized due to its low systemic absorption; however, it is predominantly eliminated through topical use without significant systemic effects.

Adverse effects

• Skin irritation
• Allergic reactions
• Contact dermatitis
• Systemic toxicity if absorbed in large amounts

Precautions

• Avoid contact with eyes
• Use with caution in individuals with sensitive skin
• Not for internal use

Pregnancy

Cetrimide should be used during pregnancy only if the potential benefit justifies the potential risk to the fetus, as there are limited studies on its safety in pregnant women.

Breast-feeding

Cetrimide is not known to be harmful when used topically during breastfeeding; however, it is advisable to avoid application on the breast area to prevent accidental ingestion by the infant.

Storage

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

Formulations

• Topical solution
• Cream
• Ointment
• Wipes

Indications

• Oral hygiene
• Skin antisepsis
• Bladder irrigation
• Urological surgery
• Management of infections associated with indwelling urinary catheters

Mechanism of action

Chlorhexidine's antimicrobial effects arise from its ability to disrupt microbial cell membranes. The positively charged chlorhexidine molecule interacts with negatively charged phosphate groups on microbial surfaces, compromising cell integrity and causing leakage of intracellular materials. This interaction allows chlorhexidine to enter the cell, precipitate cytoplasmic components, and ultimately induce cell death. At lower concentrations, chlorhexidine acts as a bacteriostatic agent, causing leakage of substances like potassium and phosphorus, while at higher concentrations, it exerts bactericidal effects.

Pharmacodynamics

Chlorhexidine exhibits broad-spectrum antimicrobial activity, effective against a variety of bacteria, yeasts, and viruses. Its action is dose-dependent, with lower concentrations (0.02%-0.06%) providing bacteriostatic effects, while higher concentrations (>0.12%) are bactericidal. Pharmacokinetic studies indicate that about 30% of chlorhexidine remains in the mouth after rinsing, allowing for slow release into oral fluids. This property, known as 'substantivity', helps prevent microbial colonization on surfaces like dentine, although prolonged use can lead to staining of oral surfaces.

Pharmacokinetics

Chlorhexidine is retained in the oral cavity at approximately 30% following rinsing, with a slow release into saliva. The pharmacokinetics of chlorhexidine indicate a high affinity for binding to tissues, which prolongs its antimicrobial action. The systemic absorption of chlorhexidine is minimal when used topically or as a rinse, making it safe for localized use. The elimination half-life and metabolism details are not well documented due to its primarily topical application.

Adverse effects

• Mucosal irritation
• Burning sensation
• Staining of teeth and oral surfaces
• Allergic reactions

Precautions

• Use with caution in patients with a history of hypersensitivity to chlorhexidine
• May cause irritation; discontinue if severe irritation occurs
• Staining may occur with prolonged use, particularly with oral formulations

Pregnancy

Chlorhexidine is generally considered safe for use during pregnancy; however, caution is advised and pregnant individuals should consult healthcare providers.

Breast-feeding

Chlorhexidine is considered safe during breastfeeding, but it is advisable to consult a healthcare provider.

Storage

Store at room temperature, away from light and moisture. Keep out of reach of children.

Formulations

• Irrigation solution (0.02% and 0.05%)
• Capsules (various strengths)
• Catheter maintenance solution (1:5000)
• Topical solutions for oral hygiene

Mechanism of action

Chlorhexidine’s broad-spectrum antimicrobial effects are due to its ability to disrupt microbial cell membranes. The positively charged chlorhexidine molecule reacts with negatively charged phosphate groups on microbial cell surfaces - this reaction both destroys the integrity of the cell, allowing leakage of intracellular material, and allows chlorhexidine to enter the cell, causing precipitation of cytoplasmic components and ultimately cell death. The specific means of cell death is dependent on the concentration of chlorhexidine - lower concentrations are bacteriostatic and result in leakage of intracellular substances such as potassium and phosphorous, whereas higher concentrations are bactericidal and cause cytoplasmic precipitation.

Pharmacodynamics

Chlorhexidine is a broad-spectrum antimicrobial with demonstrated activity against both gram-positive and gram-negative bacteria, yeasts, and viruses. Antimicrobial activity is dose-dependent - chlorhexidine is bacteriostatic at lower concentrations (0.02%-0.06%) and bactericidal at higher concentrations (>0.12%). Pharmacokinetic studies of oral chlorhexidine rinses indicate that approximately 30% of the active ingredient is retained in the mouth following rinsing, which is subsequently slowly released into oral fluids. This ability to adsorb to dentine, shared with tetracycline antibiotics such as [doxycycline], is known as "substantivity" and is the result of chlorhexidine's positive charge - it is likely that this substantivity plays at least some role in chlorhexidine's antimicrobial activity, as its persistence on surfaces such as dentine prevent microbial colonization. Dental chlorhexidine rinses may result in staining of oral surfaces, such as teeth. This effect is not ubiquitous and appears to be more significant with extended therapy (i.e. up to 6 months) - nevertheless, patients for whom oral staining is unacceptable should use chlorhexidine rinse with caution and for the shortest effective interval. Allergic reactions to chlorhexidine have been associated with the development of anaphylaxis.