LATISSE® is the first FDA-approved prescription treatment for inadequate or not enough eyelashes, growing them longer, fuller and darker. LATISSE® makes lash growth possible because of its active ingredient: bimatoprost. LATISSE® is proven to affect the growth (anagen) phase of the eyelash hair cycle in two ways: first, it increases the length of this phase, and second, it increases the number of hairs in this growth phase.