A topical antiseptic-antifungal combination used for the treatment of superficial fungal infections with secondary bacterial contamination or prophylaxis. Cetrimide is a quaternary ammonium cationic surfactant with potent antiseptic, detergent, and keratolytic properties. Ketoconazole is a broad-spectrum imidazole antifungal agent that inhibits ergosterol synthesis in fungal cell membranes. The combination provides synergistic action against dermatophytes, yeasts (especially Malassezia spp.), and bacteria commonly involved in skin and scalp infections prevalent in the hot, humid Indian climate.
Adult: Apply a thin layer to cover the affected and immediate surrounding area once or twice daily. For scalp: Apply as shampoo, lather, leave for 3-5 minutes, then rinse. Frequency depends on severity.
Note: 1. Wash and dry the affected area thoroughly. 2. Apply a thin layer and rub gently. 3. Do not cover with occlusive dressings unless directed by a physician. 4. For scalp use, use as a shampoo 2-3 times a week initially. 5. Wash hands after application unless hands are being treated.
The combination exerts a dual mechanism: 1) Ketoconazole inhibits the fungal cytochrome P450 enzyme lanosterol 14-α-demethylase, blocking the conversion of lanosterol to ergosterol. This disrupts fungal cell membrane integrity, increases permeability, and inhibits growth. 2) Cetrimide, a cationic surfactant, disrupts bacterial cell membranes (gram-positive more than gram-negative) and fungal hyphae by interacting with phospholipids. It also emulsifies and removes debris, scales, and exudate (detergent action), allowing better penetration of ketoconazole.
Pregnancy: Category C (US FDA). No adequate and well-controlled studies in pregnant women. Use only if the potential benefit justifies the potential risk to the fetus. Systemic absorption is minimal with topical use.
Driving: No effect on ability to drive or operate machinery.
| Topical Corticosteroids (e.g., Clobetasol, Mometasone) | May mask signs of infection or potentially alter skin barrier. Sequential use (ketoconazole first, wait, then steroid) is often recommended for conditions like seborrheic dermatitis. | Moderate |
| Other Topical Antiseptics (e.g., Chlorhexidine, Povidone-Iodine) | Physical/Chemical incompatibility. Cetrimide is anionic and can be inactivated by anionic detergents or soaps. Wash off previous applications before use. | Moderate |
Same composition (Cetrimide (0.5% w/w) + Ketoconazole (2% w/w)), different brands: