See also Warning section.Fever, chills, stomach upset, dry skin, muscle stiffness, diarrhea, mouth sores, dizziness, drowsiness, headache, weight gain, nausea, vomiting, and loss of appetite may occur. Nausea and vomiting can be severe. In some cases, your doctor may prescribe medication to prevent or relieve nausea and vomiting. Eating several small meals, not eating before treatment, or limiting activity may help lessen some of these effects. If these effects persist or worsen, tell your doctor or pharmacist promptly.Many people using this medication have serious side effects. However, your doctor has prescribed this drug because he or she has judged that the benefit to you is greater than the risk of side effects. Careful monitoring by your doctor may decrease your risk.Tell your doctor immediately if any of these unlikely but serious side effects occur: swollen belly, muscle pain/weakness, severe tiredness, confusion, difficulty speaking, trouble walking, vision changes (including temporary blindness), mental/mood changes (e.g., depression, agitation, hallucinations), unusual bleeding/bruising, swelling hands/feet, sudden weight gain, shortness of breath, thirst, flushing, rapid breathing.Tell your doctor immediately if any of these rare but very serious side effects occur: fast heartbeat, yellowing eyes/skin, dark urine, vomit that looks like coffee grounds.Seek immediate medical attention if any of these rare but very serious side effects occur: chest/jaw/left arm 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, 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.In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.