It is generally used for headache, dizziness, nausea, vomiting, chest tightness and other symptoms caused by heat stroke or summer dampness cold. The most important thing is that you can get a good idea of what you are looking for. The treatment of grey nails is to use some antifungal drugs, including oral itraconazole or fluconazole, and topical terbinafine cream. It usually takes longer to use the medication and even surgical nail extraction if the nail is severe. It usually takes about 100 days for finger nails and 300 days for toe nails to heal. So you have to be patient and persistent with your medication and improve your resistance to cure your gray nails and prevent recurrence.