Itraconazole is useful in the treatment of gray nails, and the cure rate can reach 80%. Itraconazole is a synthetic broad-spectrum antifungal drug, a triazole antifungal drug, effective against dermatophytes, yeasts, furfur spores, Candida spp, Aspergillus spp, stain fungi, dermatophytes, and other yeasts. The treatment of gray nail is taken as 0.2g once, 2 times a day, take a week and stop three weeks for a course of treatment. For the best absorption effect, the medicine should be taken immediately after meals, and the whole capsule should be swallowed.