LATISSE solution is a prescription treatment for hypotrichosis used to grow eyelashes, making them longer, thicker and darker. Eyelash hypotrichosis is another name for having inadequate or not enough eyelashes. The onset of effect is gradual. In the clinical trial, the majority of LATISSE users saw significant improvement by 2 months. If you stop using LATISSE, your eyelashes are expected to return to their previous appearance over several weeks to months. Only LATISSE has been approved by the FDA as a prescription treatment for hypotrichosis used to grow eyelashes.