LATISSE® works from the inside out. It is believed to affect the growth of eyelashes in two ways: first it increases the length of the growth phase; and second it increases the number of hairs that grow in this phase. LATISSE® (bimatoprost ophthalmic solution) 0.03% works gradually and remarkably to give your eyelashes the length you want— with full results after 12 to 16 weeks. As the treatment progresses, you'll begin to see changes in length, thickness and darkness gradually. After week 16, you'll see the full effect of LATISSE® — and so will others. Once you begin treatment, you must continue applying the topical solution each night and follow the directions in order to receive the best results.