Your Side Effects May IncludeJantoven side effects
warfarin
This side effect is printed on the FDA label for Jantoven. It was a question in our daily quiz, where you pick the real side effect from four choices.
Toes that turn purple
It's rare enough to get its own name on the label: purple toes syndrome.
From the FDA label
“Call your healthcare provider right away if you have pain in your toes and they look purple in color or dark in color.”
Jantoven label, updated Jul 8, 2025 ·
Read the full label on DailyMed
What to watch for
Call your doctor right away if your toes hurt and look purple or dark.
58 reports to the FDA's adverse event system mention purple or blue toes. 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.