LATISSE® is an FDA-approved treatment to grow eyelashes for people with inadequate or sparse lashes. Latisse contains a lipid compound called bimatoprost. When used to treat glaucoma it works by lowering pressure within the eye. For cosmetic benefits, Latisseworks by lengthening the period by which hair grows, along with the number of hairs that are produced. It's a prescription-only lash growth serum that works to increase your length, and according to the brand, can make your lashes fuller and darker.