• All medicines may cause side effects, but many people have no, or minor, side effects. Check with your doctor if any of these most COMMON side effects persist or become bothersome: • Change in sense of taste; diarrhea; gas; indigestion; itching; nausea; rash. • Seek medical attention right away if any of these SEVERE side effects occur: • Severe allergic reactions (rash; hives; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); dark urine; fever; infection; loss of appetite; pale stools; peeling skin; severe skin rash; sore throat; stomach pain; tiredness; unexplained, persistent nausea; vision changes; vomiting; yellowing of skin or eyes.