Flushing; dizziness, headache, insomnia, paresthesia; erythema, skin rash; diarrhea, dyspepsia, gastritis, nausea; UTI; increased liver enzymes; back pain, myalgia; visual disturbance including vision color change, blurred vision & photophobia; epistaxis, exacerbation of dyspnea, nasal congestion, rhinitis, sinusitis; fever. Abnormal hepatic function tests, absent reflexes, transient global amnesia, anemia, anorgasmia, anterior chamber eye hemorrhage, anterior ischemic optic neuropathy, arthritis, auditory impairment, basal cell carcinoma, breast hypertrophy, burning sensation of eyes, cardiac failure, cataract, cerebrovascular hemorrhage, colitis, cystitis, depression, diaphoresis, diplopia, dry eye syndrome, dysphagia, ECG abnormality, ejaculatory disorder, exfoliative dermatitis, falling, gastroenteritis, genital edema, gingivitis, glossitis, gout, herpes simplex infection, hyperglycemia, hypernatremia, hypersensitivity reaction, HTN, hypertonia, hypoglycemia, increased bronchial secretions, increased IOP, ischemic heart disease, laryngitis, leukopenia, malignant melanoma, migraine, myasthenia, mydriasis, MI, neuralgia, neuropathy, orthostatic hypotension, otalgia, peripheral edema, pharyngitis, photophobia, priapism, prolonged erection, pulmonary & rectal hemorrhage, retinal edema, hemorrhage & vascular disease, tendon rupture, seizure, severe sickle cell crisis (vaso-occlusive crisis in patients w/ pulmonary HTN associated w/ sickle cell disease), skin photosensitivity, stomatitis, syncope, synovitis, tachycardia, transient ischemic attacks, unstable diabetes, urinary incontinence, ventricular arrhythmia, vitreous detachment & traction.