The most common side effects after using Latisse are an itching sensation in the eyes and/or eye redness, skin darkening, eye irritation, dryness of the eyes, and redness of the eyelids. In the original FDA study, about 4% of patients had these side effects. In our experience, nearly all patients tolerate Latisse well. There often is a slight effect of skin darkening along the lash line which is tolerated because it gives the appearance of eyeliner. This slight skin pigmentation resolves once Latisse is discontinued. There has been information floating around about Latisse changing eye color. First, Latisse was developed from prescription drops used to treat Glaucoma called Lumigan©. Lumigan is an FDA approved eye drop prescription since 2001, meant to be placed directly on the eye daily. In the original Lumigan FDA clinical trials, there was a 1% incidence of hyperpigmentation (or darkening) of the eye color (the iris) in patients with hazel or light brown eyes. In the six years since the release of Latisse there has been NO REPORTED CASES of eye color change due to Latisse that I am aware of. With Latisse the product is applied along the lash line and studies have shown when properly placed, little if any gets on the eye itself. As such, the safety literature that accompanies Latisse mentions this rare risk of a reaction and permanent darkening of your eye color.