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Hemic and Lymphatic: vaso-occlusive crisis: In a small, prematurely terminated study of REVATIO (sildenafil) in patients with pulmonary arterial hypertension (PAH) secondary to sickle cell disease, vaso-occlusive crises requiring hospitalization were more commonly reported in patients who received sildenafil than in those randomized to placebo. The clinical relevance of this finding to men treated with Viagra for ED is not known. viagra soft tabs terazosin (Hytrin)Similar to nitrates, alpha-blockers improve blood flow. This class of drug helps to keep blood vessels relaxed and open. Alpha-blockers can be used to treat high blood pressure. Because they help relax other parts of the body, they can also be used to help urine flow in men with prostate cancer. All three ED medications can further lower blood pressure if used with alpha-blockers. The National Institutes of Health (NIH) urges caution if using PDE-5 inhibitors along with alpha-blockers.Viagra contains sildenafil, which is the same medicine found in another drug called REVATIO. REVATIO is used to treat a rare disease called pulmonary arterial hypertension (PAH). Viagra should not be used with REVATIO or with other PAH treatments containing sildenafil or any other PDE5 inhibitors (such as Adcirca [tadalafil]).

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