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Viagra is the current best-selling drug for the treatment of male impotence, and is generally a very safe drug for the treatment of erectile dysfunction. Made by Pfizer.
1. A man takes a pill of Viagra.
2. The active ingredient, sildenafil citrate, enters the bloodstream and circulates in the body.
3. Sildenafil citrate attached to PDE5 enzyme in the penis and blocks its action.
4. When the man becomes sexually stimulated, the brain sends a message to the NANC cells in his penis, which produce nitric oxide.
5. Nitric oxide creates cGMP, which begins to relax the arteries in the penis.
6. When PDE5 is disabled, the cGMP in the penis is not broken. Rather, it accumulates and allows the penile arteries be dilated;
7. The penis inflates with blood and the man has a full erection.
In summary, Viagra works by dilating the arteries of the penis allowing blood flow to achieve full erection.
Although researches showed that some patients had side effects this does not mean that side effects can always occur.
The side effects of Viagra are:
If you do not know the dose that works for you, it is recommended starting treatment with the lowest dose of Viagra, 25mg, and if you do not achieve the desired result increase the dose. The doctor will recommend you the correct dose.
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