The studies that established benefit demonstrated improvements in success rates for sexual intercourse compared with placebo. Stop taking VIAGRA and call your healthcare provider right away if you have any sudden vision loss sudden hearing decrease or hearing loss. Resources and support See the Healthy Male site for more information about erectile dysfunction and its treatment. Many people have no side effects or only mild ones. If you are taking sildenafil for erectile dysfunction, your doctor will probably start you on an average dose of sildenafil and increase or decrease your dose depending on your response to the medication. · Description and Brand Names. Drug information provided by: Merative, Micromedex® US Brand Name. Revatio; Viagra; Descriptions. Sildenafil is used to treat men who have erectile dysfunction (also called sexual impotence). Sildenafil belongs to a group of medicines called phosphodiesterase 5 (PDE5) inhibitors. AdLearn the truth about male enhancement and how to achieve optimum results naturally. Male UltraCore is the #1 Rated premium male enhancement pill for maximum resultsIndustry Leaders · Watch Video · Fully Equipped · Custom Formulation. About sildenafil (Viagra) Sildenafil is a medicine used to treat erection problems (erectile dysfunction). Sildenafil is also sometimes used to treat pulmonary hypertension (high blood pressure in the blood vessels that supply the lungs). If you have erection problems sildenafil works by temporarily increasing blood flow to your penis when.