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Viagra is used to treat erectile dysfunction, more commonly known as impotence, in men. This is when a man cannot get, or keep, a hard erect penis suitable for sexual activity. Viagra belongs to a group of medicines called phosphodiesterase type 5 inhibitors. It works by relaxing the blood vessels in your penis when you are sexually excited. This allows blood to flow into your penis, allowing you to get an erection in the natural way. Viagra will work only if you are sexually excited. Viagra will not increase your sex drive. Viagra is not for use in women. This medicine is available only with a doctor's prescription but here you can buy it without a prescription!      
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Viagra usage

Viagra is one of the most preferred drug for ED as it is very much effective and safe. How does Viagra act on imparting good erection? Viagra acts on the vessels that bring blood to the penis. As Viagra is taken, the vessels relax, which means that blood continues to flow without any fail in the region. Once the penis gets good blood, it gets its hardness and this hardness remains for a long time.

How to take Viagra

Viagra is available in tablet form. This ED tablet can be used before meals or in empty stomach. Normally, a person can have the drug an hour earlier to engaging with his partner. The doctors only prescribe a single Viagra tablet for a day and they ask to have a gap o 24 hours between two doses. You should also see that you do not go beyond your prescribed doses.

VIAGRA enhances the effect of nitric oxide (NO) by inhibiting phosphodiesterase type 5 (PDE5), which is responsible for degradation of cyclic guanosine monophosphate (cGMP) in the corpus cavernosum. VIAGRA has no direct relaxant effect on isolated human corpus cavernosum and has no effect in the absence of sexual stimulation.

When sexual stimulation causes local release of NO, inhibition of PDE5 by VIAGRA causes increased levels of cGMP in the corpus cavernosum, resulting in smooth muscle relaxation and inflow of blood to the corpus cavernosum. 

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