SIDE EFFECTS: Diarrhea, nausea, or tingling/burning/numbness/prickling feelings in your skin may occur. If any of these effects persist or worsen, tell your doctor or pharmacist promptly. Temporary hair loss may occur. Normal hair growth should return after treatment has ended. Remember that your doctor has prescribed this medication because he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects. Tell your doctor right away if you have any serious side effects, including: easy bruising/bleeding, new/worsening shortness of breath, new/worsening numbness/tingling of hands/feet, pain in your side (flank pain), symptoms of high potassium blood levels (such as muscle weakness, slow/irregular heartbeat), unusual tiredness. This medication may raise your blood pressure. Check your blood pressure regularly and tell your doctor if the results are high. This medication may lower your ability to fight infections. This may make you more likely to get a serious (rarely fatal) infection or make any infection you have worse. Get medical help right away if you have any signs of infection (such as sore throat that doesn't go away, fever, chills, cough, swollen lymph nodes). Teriflunomide can cause a mild rash that is usually not serious. However, you may not be able to tell it apart from a rare rash that could be a sign of a severe allergic reaction. Therefore, get medical help right away if you develop any rash. A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing. This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist. In the US - Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088 or at www.fda.gov/medwatch. In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.

PRECAUTIONS: Before taking teriflunomide, tell your doctor or pharmacist if you are allergic to it; or to leflunomide; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details. Before using this medication, tell your doctor or pharmacist your medical history, especially of: bone marrow/blood disorder, immune system disorder (such as due to cancer, HIV infection), current/recent infection (such as tuberculosis), high blood pressure, liver problems, lung disease. Teriflunomide can make you more likely to get infections or may worsen any current infections. Therefore, wash your hands well to prevent the spread of infection. Avoid contact with people who have infections that may spread to others (such as chickenpox, measles, flu). Consult your doctor if you have been exposed to an infection or for more details. Do not have immunizations/vaccinations without the consent of your doctor. Avoid contact with people who have recently received live vaccines (such as flu vaccine inhaled through the nose). To lower the chance of getting cut, bruised, or injured, use caution with sharp objects like razors and nail cutters, and avoid activities such as contact sports. Before having surgery, tell your doctor or dentist about all the products you use (including prescription drugs, nonprescription drugs, and herbal products). Teriflunomide may pass into the semen of men treated with this medication and the effects on sperm are unknown. Men not wishing to father a child with their female partners should use reliable birth control (such as condoms). After stopping this medication, men wishing to father a child should take a different drug as prescribed by the doctor to speed up removal of teriflunomide from the body. (See also How to Use section.) This medication must not be used during pregnancy. It may harm an unborn baby. Before starting this medication, women of childbearing age must have a negative pregnancy test. Discuss the use of reliable forms of birth control (such as birth control pills, intrauterine device-IUD) with your doctor. If you become pregnant or think you may be pregnant, tell your doctor right away. See also Warning section. This drug may pass into breast milk and could have undesirable effects on a nursing infant. Therefore, breast-feeding while using this drug is not recommended. Consult your doctor before breast-feeding.

DRUG INTERACTIONS: Drug interactions may change how your medications work or increase your risk for serious side effects. This document does not contain all possible drug interactions. Keep a list of all the products you use (including prescription/nonprescription drugs and herbal products) and share it with your doctor and pharmacist. Do not start, stop, or change the dosage of any medicines without your doctor's approval. Because leflunomide (used to treat rheumatoid arthritis) is very similar to this medication, do not take it while you are taking teriflunomide.

OVERDOSE: If someone has overdosed and has serious symptoms such as passing out or trouble breathing, call 911. Otherwise, call a poison control center right away. US residents can call their local poison control center at 1-800-222-1222. Canada residents can call a provincial poison control center.