Itraconazole can be used for the treatment of ringworm, tinea pedis and onychomycosis, etc. The dosage is different for different diseases as well as the duration of the medication, and the best therapeutic effect can only be achieved by strictly following the instruction manual of the medicine. 1. Treatment of tinea corporis: 100 mg each time, once a day, the course of treatment for 2 weeks. 2. For the treatment of tinea cruris: 100 mg each time, once a day, the course of treatment is 4 weeks. 3. For the treatment of onychomycosis: (1)Ringworm of finger nails: 200 mg each time, twice a day, one week for a course of treatment, and another course of treatment after three weeks interval. (2) toenail ringworm: 200 mg each time, twice a day, for one week as a course of treatment, after an interval of three weeks and then take a second course of treatment, and then take a third course of treatment after an interval of three weeks. 4. Treatment of candida vaginitis: 200 mg each time, twice a day, the treatment time is one day; or 200 mg once a day, once a day, for three days. Adverse effects of itraconazole mainly include nausea, anorexia, abdominal pain, abnormal liver function and headache, etc.. Contraindications to Itraconazole include allergy to the drug ingredients, severe liver dysfunction, pregnant and lactating women, etc. As different diseases will have a certain difference in the method of taking, the specific situation must strictly follow the doctor’s instructions to use the drug.