Spironol is the trade name, its scientific name is Itraconazole capsule, in the treatment of gray nail is also known as nail fungus, can be used as follows: First, shock therapy, oral 0.2g / time, 2 times / day, continuous use of 1 week for 1 shock course. For fingernail infections, you can usually choose 3 courses of shock therapy, with 3 weeks between each course of shock therapy, that is, 1 week of oral administration and 3 weeks of discontinuation. For toenail infections, 3-4 courses of shock therapy are usually used, again with a process of taking 1 week and stopping for 3 weeks. Secondly, continuous treatment can be applied by taking 0.2g/time orally, 1 time/day, for 3 months. Since this drug has certain side effects, blood tests, liver and kidney function, and monitoring of side effects are required during clinical treatment.