It is allylamine oral antifungal. It has excellent activity against dermatophytes. Like griseofulvin, it is a keratophilic medication, but unlike griseofulvin it is fungicidal. It is well delivered to the nail plate and persist for 6-9 months after treatment is ended.

INDICATIONS: Onychomycosis of nails, ringworm.

CONTRINDICATIONS: Patients with marked azotemia, hepatic failure.

SAFETY PROFILE: In renal impairment and hepatic failure. The dosages should be adjusted as there may be increases in plasma concentration of drug.

ADVERS EFFECTS: Most adverse effects are minor like diarrhea, dyspepsia, headache or rash, taste disturbances. Rarely, hepatotoxicity, severe neutropenia, Stevens-Johnson syndrome or toxic epidermal necorlysis may occur.

DRUG INTERACTIONS: Rifampicin decrease and cimetidine increase plasma terbinafine concentration.

DOSAGE: One tablet of 250 mg, daily for 12 weeks in toe nail infection and for 6 weeks in finger nail infection.