How Viagra Works
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<strong>How</strong><br />
<strong>Viagra</strong><br />
<strong>Works</strong><br />
<strong>Viagra</strong> contains<br />
sildenafil citrate<br />
packaged as a pill.<br />
When a man takes a<br />
<strong>Viagra</strong> pill, the<br />
sildenafil citrate flows<br />
throughout his body,<br />
but it really only affects<br />
the PDE5 enzyme in<br />
the penis. The drug<br />
stays in the<br />
bloodstream for about<br />
four hours, and then<br />
it's washed out of the<br />
blood by the liver<br />
and kidneys.
And that's the end of the "how it works" part of the <strong>Viagra</strong><br />
story:<br />
A man takes a <strong>Viagra</strong> pill.<br />
The sildenafil citrate enters his bloodstream and flows<br />
throughout his body.<br />
The sildenafil citrate attaches to the PDE5 enzyme in his<br />
penis and disables most of it.<br />
When the man becomes sexually aroused,<br />
the brain sends the normal message to nerve cells in his<br />
penis, which produce nitric oxide as usual.<br />
The nitric oxide creates cGMP, which starts relaxing the<br />
arteries in his penis.<br />
Since the PDE5 has been disabled, the cGMP in the penis<br />
doesn't break down. Instead, it builds up and lets the<br />
arteries in the penis fully dilate.<br />
His penis inflates with blood, and the man gets a full<br />
erection.<br />
Article Source:<br />
https://science.howstuffworks.com/viagra7.htm<br />
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