Which condition is treated with oral terbinafine?

• A. Scalp ringworm
• B. Psoriasis
• C. Atopic dermatitis
• D. Fungal nail infection

Answer: (A)

Oral terbinafine is an antifungal medication that is commonly used to treat various fungal infections, particularly those caused by dermatophytes. One significant condition effectively treated with oral terbinafine is a fungal nail infection, known as onychomycosis. This medication works by inhibiting the synthesis of ergosterol, an essential component of fungal cell membranes, leading to the death of the fungus.

In the context of facial and skin conditions, while scalp ringworm, or tinea capitis, is also caused by a dermatophyte, it is treated primarily with oral antifungals like terbinafine, especially in cases that are extensive or unresponsive to topical treatments. Terbinafine can penetrate hair follicles and is effective against the fungi that cause scalp infections.

The other conditions listed, such as psoriasis and atopic dermatitis, are not fungal infections and require different treatments, typically involving corticosteroids, immunomodulators, or other anti-inflammatory agents. Therefore, the use of oral terbinafine is specific to fungal infections, including those of the scalp and nails.