How long does Alitretinoin stay in your system?
Last updated September 7, 2026.
Alitretinoin leaves your body quickly, with a blood half-life of roughly 2 to 10 hours, so most of a dose is gone within about a day or two after your last capsule. Because the half-life is short, the drug does not build up in your body over weeks of daily dosing, and side effects such as headache, dry lips, or flushing usually settle within days of stopping. What lasts longer is the safety window around pregnancy: if you can become pregnant, contraception and pregnancy testing requirements continue for at least one month after your final dose, and you should not donate blood during that same period. Liver enzyme and cholesterol changes can also take a few weeks of monitoring to return to your baseline. Keep in mind that in the US the oral capsule form is not FDA approved, so most people here encounter alitretinoin as a topical gel applied to the skin, which produces very low blood levels. Write down the date of your last dose so you and your clinician can count the follow-up window accurately.
What to do
- Log your last dose: Note the exact date you stopped so pregnancy testing and follow-up blood work are timed correctly.
- Keep contraception going: If you can become pregnant, continue two reliable methods for a full month after your final capsule.
- Hold off on blood donation: Do not donate blood while taking alitretinoin or for one month after your last dose.
- Recheck your labs: Ask about repeat cholesterol, triglyceride, and liver tests a few weeks after stopping if yours were elevated.
- Skip extra vitamin A: Avoid vitamin A supplements and other retinoids while the drug is still in your system to limit overlapping effects.
- Call your clinician: Get prompt advice for severe headache with vision changes, yellowing skin, or a possible pregnancy.
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