Viagra helps men with ED get harder erections

Viagra is  a prescription medication to treat erectile dysfunction (ED) in men only. Viagra was the first oral medication (PDE5 inhibitor) approved by FDA. Viagra was clinically tested several times and demonstrated high efficacy in the improvement of ED symptoms in men. Viagra contains Sildenafil citrate, a selective inhibitor of cyclic guanosine monophosphate (cGMP)- specific phosphodiesterase type 5(PDE5). If you are allergic to Sildenafil or other components of the drug, do not take it. Viagra enables men even with severe ED to respond to sexual stimulation and have an erection. When a person is sexually aroused (it is a requirement for the drug to start working) Viagra helps to increase blood flow into the penis. The penis is filled with enough blood and this causes an erection which is hard and long enough for sex. After sex the erection goes away. Viagra can work for up to 4 hours. This means that you have time to be spontaneous with your sexual partner. Viagra is safe and generally causes no side effects, ask your doctor about possibility of side effects occurrence and what to do in case side effects appear.

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