Rejuvenail is an innovative water-soluble formulation containing the active ingredient ciclopirox. It has been developed for the treatment of onychomycosis (also known as fungal nail infection) of toenails and fingernails. Fungal nail infections are hard to treat and a full cure depends on several factors, including how badly damaged the nail is. While Rejuvenail can cure the fungal nail infection it cannot repair the damage, therefore a full cure can be expected in up to 30% of people.