The most common side effects of bimatoprost eyelash growth serum are itching and redness, reported in approximately 4% of clinical trial patients. If you have light-colored eyes, there's a small chance (less than 4%) that bimatoprost may permanently darken the colored part of your eye (iris).
There's also a small chance that bimatoprost will darken your eyelids, which may be reversible. You can reduce this risk by using the medication as directed. Avoid getting this medication in your eye or on your lower eyelash line.
There's also a small chance that bimatoprost will darken your eyelids, which may be reversible. You can reduce this risk by using the medication as directed. Avoid getting this medication in your eye or on your lower eyelash line.