The most common side effects of this drug are: Abdominal Pain, Abnormal Dreams, Alopecia, Anorexia, Arthralgia, Arthritis, Back Pain, Bronchitis, Chest Pain, Chills, Conjunctivitis, Constipation, Cough, Decreased Libido, Diaphoresis, Diarrhea, Dizziness, Drowsiness, Dysgeusia, Dyspepsia, Epistaxis, Fatigue, Fever, Flatulence, Flu-Like Symptoms, Flushing, Gastroenteritis, Hypertonia, Hypoesthesia, Hypotension, Impotence, Infection, Insomnia, Myalgia, Nausea, Neck Pain, Nervousness, Orthostatic Dizziness, Pain, Palpitations, Paresthesia, Peripheral Vascular Disease, Pruritus, Retinopathy, Rhinitis, Sinusitis, Skin Photosensitivity, Skin Rash, Syncope, Tachycardia, Tinnitus, Upper Respiratory Tract Infection, Urinary Frequency, Urinary Tract Infection, Vertigo, Visual Disturbance, Voice Disorder, Vomiting, Weakness, Xerostomia