Therefore, if you suspect that you may have become pregnant, stop taking this medicine immediately and check with your doctor. Leflunomide may cause birth defects in the children of the men taking it during the time of conception. Therefore, men taking leflunomide should use condoms as a form of birth control during sexual intercourse. A man intending to father a child should stop taking this medicine and check with his doctors. Do not drink alcohol while using this medicine .
Alcohol can increase the chance of liver problems.
Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention. Other side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. If you notice any other effects, check with your doctor.