Viagra and Erectile Response

erectiel responseNumerous clinical trials and studies of Viagra medicine have shown that the main ingredient Sildenafil works effectively to improve organic or psychogenic impotence in men. Improved erections were estimated with the special gadget RigiScan which helps to measure the hardness (rigidity) of the penis. The results produced by Viagra were compared with placebo results.
Approximately 45 minutes-1 hour after oral use of Viagra, a man with the help of sexual stimulation gets an erection. The quality of erection was proven to be great with the increase in size of the penis and the duration of the erection.
The period during which Viagra is effective is 4 hours.

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