Viagra works by blocking PDE-5 from working. This way, blood flow to the penis can occur and not be stopped by PDE-5. This also widens your blood vessels to allow more blood to flow into your penis.

Viagra works by inhibiting an enzyme in the body known as PDE5, short for phosphodiesterase type 5. This enzyme breaks down ...

Viagra (sildenafil) Cialis (tadalafil) Type: PDE5 inhibitor : PDE5 inhibitor : Dosage: 25-100 milligrams (mg), but only once every 24 hours : 2.5-5 mg daily, or 5-20 mg taken as needed ...

Most men and women know at least vaguely what Viagra does, but not everyone knows how it does it. Things You Probably Don't Know About Viagra (Like What It Was Originally Used For) Skip to main ...

Sniff to get stiff! The spray-to-play product works to make men hard in as little as five minutes. Getty Images/iStockphoto. Viagra is one of the most popularly prescribed medications for erectile ...

Dosage. The amount of Viagra you take affects how long it stays in your system. The smallest available dose, 25 milligrams (mg), won’t last as long as the largest available dose, 100 mg.

Viagra, Cialis and their generic equivalents are what are known as phosphodiesterase type 5 (PDE5) inhibitors. They open up your blood vessels and can be used in a variety of ways, including the ...

The team was able to find a novel, potent PDE-5 inhibitor, UK-92,480, and they rapidly advanced this compound to the clinic. The initial trials in volunteers were disappointing.

Viagra Could Be Good for Your Brain. Artificial intelligence is allowing scientists to discover new uses for old medications. By . Allysia Finley. Share. Resize. Listen (2 min) ...