Your Side Effects May IncludeLumigan side effects
bimatoprost
This side effect is printed on the FDA label for Lumigan. It was a question in our daily quiz, where you pick the real side effect from four choices.
Your eye color darkens, likely for good
Brown eyes can get browner. The label says the change is likely permanent.
From the FDA label
“Pigmentation of the iris, periorbital tissue (eyelid) and eyelashes can occur. Iris pigmentation is likely to be permanent.”
Lumigan label, updated Jun 22, 2024 ·
Read the full label on DailyMed
What to watch for
The color change can be permanent, so ask about it before you start.
99 reports to the FDA's adverse event system mention a darker iris. A report is not proof the drug caused it. See the query
From quiz No. 2 · September 26, 2026 · Play that quiz →
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Not medical advice. Don't stop or start a medication because of a quiz. Talk to your doctor or pharmacist. Label text and report counts from openFDA. Not affiliated with any drug maker.