Who Doesn't Know Viagra ?

Who doesn't know Viagra ? Viagra is very popular for men. What is it for ?

Viagra helps a man with erection disfunction. Viagra contains Sildenafil Citrate. How does it work ? Viagra will block phosphodiesterase-5 (PDE5) enzyme and cause the extension of blood-vessels then increases blood flow to penis, at the end Viagra makes a penis bigger. Then, the penis can erect. Viagra will not be effective if it's consumed without sexual stimulation. So, if someone consumed Viagra but he doesn't continue it with sexual activity, it will be useless. Sildenafil has been approved by FDA (Food and Drug Administration) since March 27 1998 and now become the market leader for erection disfunction treatment.

But, don't use Viagra as you want. However every medicines have side effects. The common side effects are headache, gastrointestinal track disturbance, vision disturbance, etc. Viagra must be used as doctor's recipe and patient with cardiovascular disturbance must be careful use this Viagra. 

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