With Latisse, you can have longer, fuller, darker lashes in approximately four weeks. Latisse is the first FDA-approved prescription for the growth of fuller lashes. The active ingredient is bimatoprost opthalmic solution, which is applied to the base of the eyelashes with a provided applicator nightly. Latisse works in two ways: first, it increases the length of this phase; and second, it increases the number of hairs in this growth phase. The exact way it works is unknown. Latisse is not a replacement for mascara. In fact, mascara can be used to enhance the Latisse’s effects on your lashes. Talk with your doctor to find out more about Latisse for your lashes.