Flushing, hypersensitivity reactions, rash; indigestion, nausea, dyspepsia, abdominal pain, vomiting, gastro-esophageal reflux; backache, myalgia; headache, dizziness; nasopharyngitis, resp tract infection, nasal congestion, dyspnea, epistaxis. Angina, chest pain, heart failure, MI, tachycardia, palpitations, flushing, hypotension, HTN, peripheral edema, fatigue; SJS; cerebral hemorrhage, CVA, seizure; anterior ischemic optic neuropathy, non-arteritic retinal artery occlusion, thrombosis of retinal vein, blurred vision, eye pain; sudden onset of decreased hearing, sudden hearing loss, tinnitus; hematuria; prolonged erections.