LATISSE® solution is a growth treatment for hypotrichosis (inadequate or not enough eyelashes). It is the only FDA-approved treatment clinically proven to grow lashes and the only growth product of its kind available by prescription, using the active ingredient bimatoprost. It is a once-nightly treatment you apply topically to the base of your upper eyelashes, as instructed by your doctor. Then, gradually, the results come in. You may start to see more length in as little as 4 weeks and you should achieve full growth in 16 weeks.