Bifonazole is a topical antifungal first developed in the late 1970s. It treats skin infections like athlete’s foot, ringworm, and jock itch by disrupting the fungal cell membrane, which inhibits growth and kills the fungus. Widely available over the counter, it is often applied as a cream or lotion to clear mild fungal infections.
BRAND NAMES
Canespor – widely used for fungal skin infections
Bifon – topical antifungal cream
Mycofene – available in some countries for athlete’s foot and ringworm
MECHANISM OF ACTION
Bifonazole is an antifungal that works by blocking the production of ergosterol, a key component of the fungal cell membrane. This weakens the membrane, disrupts cell function, and ultimately kills the fungus, making it effective against skin infections like athlete’s foot and ringworm.
PHARMACOKINETICS
Absorption
Bifonazole is poorly absorbed through intact skin, which makes it primarily act locally at the site of application. Only a small amount may penetrate deeper layers, so systemic effects are rare, and it is mainly used as a topical treatment for skin fungal infections.
Distribution
After topical use, only about 0.6–0.8% of bifonazole is absorbed into the bloodstream, with most staying in the skin to fight infection.
Metabolism
Bifonazole is metabolized in the liver by the cytochrome P450 system into inactive compounds. Since it is mainly used topically and poorly absorbed, systemic metabolism is minimal.
Excretion
Bifonazole is primarily excreted in the urine and feces as inactive metabolites. Because systemic absorption is low after topical use, only small amounts reach the bloodstream and are eliminated.
PHARMACODYNAMICS
Bifonazole is a topical antifungal that disrupts fungal cell membranes by blocking ergosterol synthesis, inhibiting growth and killing the fungus. It acts locally on the skin with minimal systemic effects.
ADMINISTRATION
Bifonazole is applied topically as a cream, lotion, or solution directly to the affected skin once or twice daily, usually for 2–4 weeks, depending on the type and severity of the fungal infection.
DOSAGE AND STRENGTH
Bifonazole is commonly available as a 1% cream or lotion. The usual dosageis once or twice daily applied to the affected area for 2–4 weeks, depending on the infection type and severity.
FOOD INTERACTIONS
Since bifonazole is used topically and poorly absorbed systemically, it has no significant food interactions. Its effectiveness is not affected by meals or diet.
DRUG INTERACTIONS
Bifonazole has minimal drug interactions due to low systemic absorption, but caution is advised with CYP450-metabolized drugs if applied over large areas or under occlusion.
CONTRAINDICATIONS
Bifonazole is contraindicated in individuals with a known hypersensitivity to bifonazole or any component of the formulation. It should not be applied to open wounds or mucous membranes unless specifically directed by a doctor.
SIDE EFFECTS
Common side effects of bifonazole are usually mild and localized, including burning, itching, redness, or irritation at the application site. Rarely, allergic reactions like rash or swelling may occur.
TOXICITY
Bifonazole has low systemic toxicity due to minimal absorption through intact skin. Overuse or application on large areas may rarely cause mild skin irritation, but serious toxic effects are uncommon.
