Gray nails are known as onychomycosis. The medicines for treating onychomycosis are divided into topical and oral medicines, such as amorolfine application, terbinafine tablets and so on. 1. Amorphophallus application: the main ingredient of amorphophallus application is amorphophallus, which is mainly used for the treatment of fungal diseases caused by skin fungi, such as tinea pedis, tinea corporis, tinea pedis, tinea cruris and so on, it is a derivative of morpholine, which can inhibit fungi by interfering with the biosynthesis of ergosterol in the cell membranes of fungi. Adverse reactions may include mild skin irritation such as erythema, itching, or a mild burning sensation. It should not be used by patients who are allergic to this drug and should not be used by women during pregnancy. 2. Terbinafine tablets: Terbinafine tablets is an oral drug, the main ingredient is terbinafine hydrochloride, mainly also inhibit the fungus, gray nails simple use of topical medication, can not be very good penetration, so the therapeutic effect is limited, you need to cooperate with the oral medication together with the treatment. Adverse reactions are rash, itching, etc., may also appear gastrointestinal symptoms, such as loss of appetite, nausea, abdominal pain and so on. Nail fungus should be based on the severity of the disease, under the guidance of the doctor to choose the appropriate drug treatment, the above drugs should be used in accordance with the doctor’s instructions, can not be used blindly.