The present invention relates to plasters for prophylaxis and/or treatment of a dysfunction or disorder of nails, especially onychomycosis, onychocryptosis, nail psoriasis, melanonychia striata, and onychodystrophy, the use of said plasters and methods for prophylaxis and/or treatment of a dysfunction or disorder of nails using said plasters. Said dysfunction or disorder of nails may be induced or caused by drugs, systemic diseases, chemical compounds, physical influences, fungal, yeast, or bacterial infection of the nails and/or the nail beds, or in the context of skin diseases. The plasters show good therapeutically effects on said dysfunction or disorder of nails without the need of drilling a hole into the nail and/or daily scraping of the nail. Preferred embodiments of the plasters consist of an occlusive backing layer and a layer attached to said backing layer. The layer comes in close contact with the nail and optionally with the surrounding skin. The layer is made of a adhesive, a skin and/or nail permeation enhancer, a therapeutically effective amount of sertaconazole, and suitable additives, and/or further pharmaceutically active agents.