<p>Common side effects include dizziness, drowsiness, tired feeling, flushing (warmth, redness, or tingly feeling), back pain, nausea, diarrhea, stomach pain. Other adverse events include allergy, fever, leg pain, chest pain, insomnia, somnolence, and dry mouth, elevations of liver enzymes or serum bilirubin, leg cramps, myalgia, dermatitis. Other adverse events that have been reported includes weakness, gastric irritation, photosensitivity, urticaria, muscle spasm, restlessness.</p>