Latisse is the first and only FDA-approved prescription treatment for hypotrichosis (inadequate or not enough lashes). It is a topical solution that is applied to the base of the upper eyelashes once daily to promote the growth of longer, fuller, and darker lashes. The active ingredient in Latisse is bimatoprost, which has been shown to increase the growth phase of eyelashes, resulting in more noticeable and dramatic lashes.