Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat. Stop taking this medication and call your doctor at once if you have a serious side effect such as: •nausea, pain in your upper stomach, low fever, loss of appetite; •dark urine, clay-colored stools; •jaundice (yellowing of the skin or eyes); •sudden numbness or weakness, especially on one side of the body; •sudden severe headache, confusion, problems with vision, speech, or balance; •chest pain, sudden cough, wheezing, rapid breathing, coughing up blood; •pain, swelling, warmth, or redness in one or both legs; •easy bruising, unusual bleeding (nose, mouth, vagina, or rectum), purple or red pinpoint spots under your skin; or •blurred vision, eye pain, or seeing halos around lights. Less serious side effects may include: •mild nausea, vomiting, upset stomach; •muscle pain; •numbness or tingly feeling; •redness of the eyes; or •heavy vaginal bleeding. This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.