Answer: In short, the drug in Viagra, Sildenafil, dilates blood vessels at the entrance to the penis. By stopping this enzyme, the drug allows better blood flow into the penis, meaning better erections. Erectile dysfunction medications require a prescription from a licensed provider. They have the same benefits and risks as their brand-name counterparts. People taking nitrates like nitroglycerin Nitrostat or isosorbide mononitrate Imdur should not take PDE5 inhibitors, as doing so could result in a dangerous drop in blood pressure. At the same time, the brain tells other vessels near the penis to tighten up, to keep blood in this sponge tissue — and this is what makes an erection last.Compare prices and print coupons for Viagra (Sildenafil) and other drugs at CVS, Walgreens, and other pharmacies. Prices start at $ CHOOSE BRAND-NAME VIAGRA. The original little blue pill prescribed by doctors for over 20 years. Clinically proven to treat men with erectile dysfunction (ED) Ongoing . Consumer Reports Best Buy Drugs shares how you might be able to get generic Viagra, known as sildenafil, at a much lower price.

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