Terbinafine hydrochloride cream for gray nails is generally ineffective and is not usually used as a drug of choice for the treatment of gray nails. Gray nails are infections of the nail plate and subnail tissue of the finger or toenail caused by fungi. It manifests as discoloration, turbidity, thickening, atrophy, separation, buckling, uneven surface, shedding, hooked nails, and onychomycosis of the fingernails or toenails. Terbinafine Hydrochloride Cream belongs to a kind of antifungal medication, which is used to treat ringworm, tinea cruris, tinea pedis, tinea corporis, tinea pedis, tinea cruris, and skin candidiasis. Terbinafine cream is not effective in the treatment of gray nails, usually the treatment of gray nails can be used topical amorolfine application, cyclopiazone application, etc., if necessary, oral terbinafine or itraconazole capsule treatment. Adverse effects of terbinafine hydrochloride cream can be seen in skin flaking, itching, skin lesions, scabs, etc. The drug is contraindicated for those who are allergic to the product, and for breastfeeding women. The drug should be used reasonably under the guidance of a doctor.