Latisse is used to improve eye lash growth in humans. It is the first treatment of its kind to be approved by the Food and Drug Administration for sparse and/or thinning eyelashes. Visible results can be seen within eight weeks. At the end of sixteen weeks, maximum results will be obtained. This includes eyelash darkening, thickening, and lengthening of the upper and lower eyelashes. New growth of human eyelashes occurs in cycles, making Latisse an ongoing treatment. As eyelashes fall out, new eyelashes need to be treated. One bottle of Latisse will last approximately sixteen weeks.