How long does it take for ringworm to go away after you begin using Lamisil?

The amount of time necessary for ringworm to go away after taking Lamisil depends on the severity and location of the infection, as stated by RxList. Patients must take Lamisil as prescribed by their doctor to completely eliminate ringworm. Most prescriptions are between six and 12 weeks long.

Ringworm is a fungal infection that appears as round patches on skin, according to LamisilAT. Most cases of ringworm can be treated using topical, over-the-counter anti-fungal treatments. LamisilAT offers topical products that use the same active ingredient as Lamisil pills, called terbinafine, although at a lower dose. LamisilAT should be taken as directed by the product label, which is usually once a day for a week.