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Terbinafine comes as a tablet to take by mouth. It is usually taken once a day for 6 weeks for fingernail fungus and once a day for 12 weeks for toenail fungus. Follow the directions on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand. Take terbinafine exactly as directed. Do not take more or less of it or take it more often than prescribed by your doctor. Your fungus may not be completely cured until a few months after you finish taking terbinafine. This is because it takes time for a healthy nail to grow in.

Terbinafine may cause side effects. Tell your doctor if any of these symptoms are severe or do not go away: * diarrhea * upset stomach * stomach pain * rash * itching * hives * changes in taste or loss of taste Some side effects can be serious. The following symptoms are uncommon, but if you experience any of them, call your doctor immediately: * upset stomach that does not go away * loss of appetite * extreme tiredness * vomiting * pain in the right upper part of the stomach * dark urine * pale stools * severe skin rash that keeps getting worse * fever, sore throat, and other signs of infection Terbinafine may cause other side effects. Call your doctor if you have any unusual problems while taking this medication.