Pharmacological Viagra effects appear because of blood flow increasing to penis of a man. Viagra effect is provoked by main active substance Sildenafil by name. This drug is included in group of selective inhibitors 5type phosphodiesterase. Drugs represented by this group, basically are used for treatment of erectile dysfunction, because their pharmacological action is directed on quick increasing of the blood flow to penis, as a result appears required erection for making love.
Viagra effect appears only in case having natural sexual arousal. According to the appearance of sexual arousal, special mechanisms and chemical reaction appear in organism, which increase blood flow and increase erection. Because of erectile dysfunction penis doesn’t get enough amount of blood, that’s why basic Viagra effect is flowing blood to penis.
Pharmacological Viagra effect continues till 4 hours. During these 4 hours you can manage not one sexual intercourse. Drug will realize process of erection appearance with each sexual stimulation, and after ending of sex, penis will return in return in relaxed condition in natural way. Pharmacological Viagra effect doesn’t have treating effect, but it helps to manage sexual intercourses without limit and worries about quality of your erection. Effect Viagra is supervised in 99% of cases in case of drug use.

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