Inclusion Criteria:

• Age of at least 18 years;
• Positive clinical findings of onychomycosis according to the judgement of the investigator (e.g. thickening, discoloration, structural changes, misshaped nails);
• Positive mycological findings (positive microscopy and positive culture with identification of pathogen) in material taken from affected nail sites before the start of treatment;
• Nail mycosis with an affected nail area between 20% and 50% in the target nail,
• Nail mycosis in not more than 3 nails (each nail not more than 50% infected area);
• Willingness and ability to understand and adhere to the trial procedures;
• Provide a personally signed and dated informed consent indicating that the subject has been informed of all pertinent aspects of the trial;
• Subjects of childbearing potential must use an acceptable method of contraception. Hormonal or oral contraceptive drugs, intra-uterine devices (IUD) and abstinence are considered acceptable methods of contraception.

Exclusion Criteria:

• Doubtful or negative mycological findings;
• Proximal subungual onychomycosis (PSO);
• Topical antimycotic treatment of feet or hands within 4 weeks prior to screening, topical treatment of onychomycosis of feet or hands within 12 weeks prior to screening;
• Systemic antimycotic treatment within 12 weeks prior to screening;
• Failure to treat tinea pedis/manus (diagnosed at screening) successfully with topical treatment between screening visit and visit 1 (baseline);
• Tinea pedis/manus at visit 1 (baseline);
• Uncontrolled diabetes mellitus assessed by HbA1c-level (>8.5);
• Psoriasis;
• Arterial circulatory disorders;
• Chronic venous insufficiency;
• Diabetic neuropathy;
• History of hypersensitivity to bifonazole, or any other similar pharmacological agents or components of the products;
• Known sensitivity to plasters.