Nausea, heartburn, headache, dizziness, menstrual period changes, trouble sleeping, increased sweating, or acne may occur. If any of these effects persist or worsen, tell your doctor or pharmacist promptly. 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. Because this drug works by weakening the immune system, it 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. Tell your doctor immediately if you have any signs of infection (such as cough, sore throat, fever, chills). Use of this medication for prolonged or repeated periods may result in oral thrush or a yeast infection. Contact your doctor if you notice white patches in your mouth or a change in vaginal discharge. This medication may infrequently make your blood sugar level rise, which can cause or worsen diabetes. Tell your doctor immediately if you develop symptoms of high blood sugar such as increased thirst and urination. If you already have diabetes, be sure to check your blood sugars regularly. Your doctor may need to adjust your diabetes medication, exercise program, or diet. Tell your doctor immediately if any of these unlikely but serious side effects occur: unusual tiredness, swelling ankles/feet, unusual weight gain, vision problems, easy bruising/bleeding, puffy face, unusual hair growth, mental/mood changes (such as depression, mood swings, agitation), muscle weakness/pain, thinning skin, slow wound healing. This drug may infrequently cause serious (rarely fatal) bleeding from the stomach or intestines. If you notice any of the following unlikely but serious side effects, consult your doctor immediately: black/bloody stools, vomit that looks like coffee grounds, persistent stomach/abdominal pain. Seek immediate medical attention if any of these rare but serious side effects occur: chest pain, seizures. A very serious allergic reaction to this drug is rare. However, seek immediate medical attention if you notice any symptoms of a serious allergic reaction: 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. In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.