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Lamisil (Terbinafine) is an antifungal agent.

Drug Name

Lamisil (Terbinafine)

Drug Uses

Tablets: Fungal infections of the toe, or fingernail, caused by the fungus, tinea unguium.Cream: Fungal infections of the skin, including tinea pedis ("athlete's foot"), tinea corporis, and tinea cruris ("jock itch").

How Taken

Tablets: The usual dose is 250 mg once daily for 6 weeks for the treatment of fingernails, and 12 weeks for the treatment of toenails. Alternatively, terbinafine may be given as two tablets (500 mg) once daily for 7 days during the first week of each month for 3 months for toenail infections. For children under 20kg (44 pounds), a dose of 62.5 mg/day, and for children between 20 and 40kg (44 and 88 pounds) a dose of 125 mg/day have been recommended. Lamisil may be taken with or without food.

Drug Class and Mechanism

Lamisil is an antifungal agent that is taken by mouth or applied to the skin. Lamisil acts by interfering with the ability of fungi to make chemicals, called sterols, that are an important part of the membrane that surrounds fungal cells and holds them together. This weakens the cell membrane. Oral Lamisil is more effective for treating fungal nail infections than griseofulvin (Fulvicin; Gris-Peg) and itraconazole (Sporanox), two other antifungal agents, used for treating fungal nail infections. Topical Lamisil was approved by the FDA in 1993. Lamisil oral tablets were approved in 1996.

Missed Dose

If you miss a dose, take it as soon as you remember. If it is near the time of the next dose, skip the missed dose and resume your usual dosing schedule. Do not double the dose to catch up.


Store at room temperature 77 degrees F (25 degrees C) away from light and moisture. Do not store in the bathroom. Keep all medicines away from children and pets.