Acitretin is a retinoid, which is a form of vitamin A. It is used to treat severe psoriasis in adults. It is not a cure for psoriasis, and you may relapse after you stop taking this medication. Acitretin (http://www.guidechem.com/cas-550/55079-83-9.html) can harm an unborn baby or cause birth defects. Do not use acitretin if you are pregnant or plan to become pregnant within 3 years after you stop taking acitretin. Women taking acitretin must not drink alcohol during treatment and for at least 2 months after treatment ends.