This study is designed to assess the efficacy, safety and tolerability of a topical formulation of terbinafine solution applied daily in patients with toenail fungus. This trial will study patients with mild to moderate toenail fungus disease of the big toenail and their responses to two treatment durations, 24 or 48 weeks.

Inclusion Criteria:

• Male and females 12 - 75 years of age
• Fungal toenail infection of one or both of the large (great) toenails
• The nail infection must be due to a dermatophyte, (mixed infections dermatophyte and non-dermatophyte] are not allowed)

Exclusion Criteria:

• Target foot must not have severe plantar (moccasin) tinea pedis that would require systemic therapy. Mild to moderate tinea pedis (athlete's foot) infection should be treated with terbinafine prior to baseline or at any time during the trial. Other topical treatments for athlete's foot may be recommended at the discretion of the investigator.
• Subjects must not have abnormalities of the nail that could prevent a normal appearing nail if clearing of infection is achieved
• No administration of systemic antifungal medications within 6 months prior to screening visit
• No application of prescription topical antifungal medications for toenail fungus within 3 months or other commercially available topical medications for toenail fungus applied directly to the toenails within 1 month prior to screening visit
• No professional pedicures or application of any nail polish product or nail cosmetic to the toenails after the screening visit
• Known pregnancy or lactation at time of enrollment

Other protocol-defined inclusion/exclusion criteria may apply