The purpose of the study is to determine the safety and efficacy of 1% and 5% AN2690 solutions in the treatment of distal, subungual onychomycosis of the great toenail.

The first group of 30 protocol-qualified subjects will be assigned to Treatment Group 1 and given 1% AN2690 Solution. The second group of 30 protocol-qualified subjects will be assigned to Treatment Group 2 and given 5% AN2690 Solution.

Inclusion Criteria:

• Witnessed, signed informed consent approved by Institutional Review Board/Ethics Committee
• A signed Health Insurance Portability and Accountability Act (HIPAA) authorization form which permits the use and disclosure of subject's individually identifiable health information for those enrolled in the United States of America
• Male or female subjects of any race 18 -65 years of age
• Subjects with a diagnosis of onychomycosis of at least one great toenail and with a positive KOH wet mount and a positive fungal culture for dermatophyte species
• Onychomycosis involving 20-60% of the affected great toenail as determined at baseline (Day1) by visual inspection after the nail has been trimmed
• The combined thickness of the distal nail plate and the associated hyperkeratotic nail bed <3 mm
• Affected great toenail to be treated is capable of re-growth as documented by history or recent observation of at least 2 mm of growth

Exclusion Criteria:

• Females of childbearing potential not using a highly effective method of birth control (e.g. implants, injectables, combined oral contraceptives, some intrauterine contraceptive devices) during the study

• Subjects unwilling to refrain from the use of nail cosmetics such as clear and or colored nail lacquers from the screening visit until the end of the study

• Subjects with chronic moccasin type of T. pedis

• Subjects with a history of having failed any previous topical antifungal therapy for their onychomycosis

• Diabetes mellitus requiring treatment other than diet and exercise

• Subjects that have not undergone the specified washout period(s) for the following topical preparations or subjects who require the concurrent use of any of the following topical medications:

  1. Topical antifungal applied to toenails (does not include antifungals for treatment of T. pedis): 12 weeks
  2. Anti-inflammatories, corticosteroids, topical immunomodulators (in the treatment area): 2 weeks

• Subjects that have not undergone the specified washout period(s) for the following systemic medications or subjects who require the concurrent use of any of the following systemic medications:

  1. Corticosteroids (including intramuscular injections): 2 weeks
  2. Antifungals for treatment of onychomycosis or any systemic antifungal with known activity against dermatophyte species: 24 weeks
  3. Systemic immunomodulators: 4 weeks

• Treatment of any type for cancer within the last 6 months

• History of any significant internal disease

• Subjects with a medical history of current or past psoriasis of the skin and/or nails

• Concurrent lichen planus

• Subjects who are known to be allergic to any of the test product(s) or any components in the test product(s) or history of hypersensitivity or allergic reactions to any of the study preparations as described in the Investigator's Brochure

• Nail or anatomic abnormalities of the toe, e.g., genetic nail disorders, primentary disorders, onychogryphosis, trauma to the nail(s) to be treated

• AIDS or AIDS related complex

• History of street drug or alcohol abuse

• Any subject not able to meet the study attendance requirements

• Subjects who have participated in any other trial of an investigational drug or device within 60 days prior to enrollment or participation in a research study concurrent with this study