What is the treatment of choice for severe tinea pedis?

• A. Topical Clotrimazole
• B. Oral Terbinafine
• C. Topical Miconazole
• D. Oral Griseofulvin

Answer: (B)

The treatment of choice for severe tinea pedis, commonly known as athlete's foot, is oral terbinafine. This antifungal medication is particularly effective in addressing more extensive or resistant fungal infections that do not respond sufficiently to topical treatments.

In cases of severe tinea pedis, the infection can involve deeper layers of the skin or may have led to secondary bacterial infections, which are less effectively treated with topical antifungals alone. Oral terbinafine works by inhibiting a key enzyme in the ergosterol synthesis pathway, which is critical for the integrity of fungal cell membranes. This results in the effective disruption of fungal growth and ultimately eradication of the infection.

While topical agents like clotrimazole and miconazole can be effective for mild to moderate cases of tinea pedis, they might not reach adequate concentrations in the skin to clear more severe or widespread infections. Oral griseofulvin is less commonly used in practice for tinea pedis, especially in cases considered severe when compared to terbinafine, which has a more favorable efficacy profile and endurance against dermatophyte infections.