Gray nails, i.e., onychomycosis, are generally ineffective with povidone-iodine (generic name povidone-iodine solution), and can be treated with medications such as terbicarbonate.
Povidone iodine solution is suitable for skin fungal infections, suppurative dermatitis, small area of mild burns cleanup, also used for small area of skin, mucous membrane wounds disinfection, but used for onychomycosis is generally ineffective. Note that the drug is contraindicated in people who are allergic to the product, pregnant and lactating women. During the use of the drug there may be a slight transient irritation of the localization of the wound mucosa, which usually disappears on its own after a few moments.
Nail fungus is caused by dermatophytes invading the nail plate and subnail tissues, oral drugs can choose Tebizafen, itraconazole, topical drugs can choose 5% amorolfine application. The specific use of drugs should be carried out under the guidance of a physician.