Some minor side effects include, abnormal stools, back pain, bloating, swelling of hands, ankles and feet, diarrhea, dizziness, loss of balance, gas, headache, increased cough, indigestion, infection, muscle aches, nausea, runny nose, sore throat, stomach pain and swelling of the legs. More severe side effects may mean seeking emergency treatment for symptoms including severe allergic reactions, hives, difficulty breathing, chest tightness, swelling around the face, lips, mouth and tongue, black tarry stools, irregular heartbeat, unusual bruising or bleeding and vomiting up a substance that looks like coffee grounds.