Taking terbinafine is usually appropriate for three months, and prolonged use of the drug is not recommended. Terbinafine is an antifungal drug for diseases caused by fungal infections, the length of treatment depends on the clinical response and the severity of the infection, it is generally recommended that a maximum of three months is appropriate, prolonged use of the drug may cause damage to the liver and kidneys, the patient, if the drug treatment is effective, but not yet completely and thoroughly recovered, you can moderately prolong the course of treatment, it is recommended that you go to the hospital to consult a doctor. Terbinafine need to pay attention to before taking, Terbinafine is prohibited for those who are allergic to the ingredients contained in Terbinafine, the process of taking the drug may cause nausea, lack of appetite, diarrhea, mild abdominal pain, headache and other adverse reactions. It is contraindicated for those who are allergic to any of the components of the drug. It is recommended to use it under medical supervision.