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WebMar 22,  · How Does Viagra® Work? March 22, The little blue pill Viagra® is today universally recognized, but that wasn’t always so. Viagra was developed in the .Instead, it builds up and lets the arteries in the penis fully dilate. Teva sued to have the latter patent invalidated, but Pfizer prevailed in an August federal district court case. Viagra Side Effects Common side effects of Viagra include headache, flushing, indigestion, dizziness, and nausea. This does not mean that Viagra will work for 16 to 20 hours. Once it’s up, cheaper, generic versions of the drug are expected to flood the market. Other prescription medications in the PDE-5 inhibitor class besides Viagra include the following: Generic vardenafil is similar to Viagra and may last up to five hours.AdViagra pills delivered to your door. Get treatment for ED, no medical insurance needed. No hidden costs. Works for 80% of men. Get same day prescription from our US medical team.5* customer reviews · No insurance needed · Affordable prices · Discreet delivery/5 ( reviews)4 Tablets – $ · 8 Tablets – $ · 28 Tablets – $ · 64 Tablets – $ AdDon’t Waste Your Time With The Junk Pills And High Prices, We are Rated #1 For A Reason. Best Pills, Best Prices. No 2nd Rate Or Even Fake Pills From China Like The Other GuysShips in 24 Hours · Order Today · Fast, Private And Easy · Best Price on Best Pills. WebAnna Nelson 6 hrs. ago.When a man takes a Viagra pill, the sildenafil citrate flows throughout his body, but it really only affects the PDE5 enzyme in the penis. The nitric oxide creates cGMP, which starts relaxing the arteries in his penis. The sildenafil citrate enters his bloodstream and flows throughout his body. To better understand its function, consider that an enzyme is a specially folded protein that can speed up a chemical reaction. Other prescription medications in the PDE-5 inhibitor class besides Viagra include the following: Generic vardenafil is similar to Viagra and may last up to five hours.