Common side effects include itching of the eyes, eye irritation, dry eyes, eye redness, eye lash darkening and reversible darkening of skin around the eyes. Bimatoprost may also cause permanent brown pigmentation in the colored part of the eye and hair growth in other areas of the body that it comes in contact with.
Bimatoprost should be administered at least five minutes before or after other eye medications. Use of bimatoprost for eyelash growth may increase or decrease the effect of prostaglandin-like drugs used for treating elevated IOP. Bimatoprost solution contains benzalkonium chloride, which may be absorbed by soft contact lenses. Contact lenses should be removed prior to application of bimatoprost. Contact lenses may be reinserted 15 minutes following administration of bimatoprost.