Common side effects are black, tarry stools, bloody urine, body aches or pain, chest pain, cough, decreased frequency or amount of urine, dizziness, ear congestion, fever or chills, headache, increased thirst, loss of appetite, loss of voice, lower back or side pain, nasal congestion, nausea, painful or difficult urination, pale skin, runny nose, sneezing, sore throat, swelling of the face, fingers, or lower legs, tightness in the chest, troubled breathing, ulcers, sores, or white spots in the mouth, unusual bleeding or bruising, unusual tiredness or weakness, vomiting, weight gain.