Nausea, vomiting, stomach ache, diarrhea, metallic taste in the mouth, fever, headache, runny nose, sneezing, 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.Tell your doctor immediately if any of these unlikely but serious side effects occur: burning mouth/throat, sore teeth/gums, swelling inside the mouth, increased saliva, eye irritation/swollen eyelids, severe headache, swelling of the front of the neck/throat (goiter), signs of decreased thyroid gland function (e.g., weight gain, cold intolerance, slow/irregular heartbeat, constipation, unusual tiredness), confusion, numbness/tingling/pain/weakness of the hands/feet.Seek immediate medical attention if any of these rare but very serious side effects occur: chest pain, black stools, vomit that looks like coffee grounds, bloody diarrhea.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, fever with joint pain.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.