Viagra is part of the PDE5 Inhibitors class and treats Erectile Dysfunction. PDE5 inhibitors are used to treat erectile dysfunction, pulmonary hypertension, and benign prostatic hyperplasia. They work by relaxing blood vessels, allowing more blood flow to certain parts of the body including the heart. Viagra is only available as a brand name drug. Compare with other PDE5 Inhibitors. [Learn more]
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