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formulation were discovered by accident during testing on finding cure for hypertension and ischemic heart disease. During laboratory tests it turned out that even though sildenafil does not cure cardiovascular diseases, helps to cause an erection of the penis. The material was patented in 1996, and two years later introduced to the market under the name (Skt. Wjaghra ), which in writing Sanskrit means "tiger". - action Erection problems often are associated with the overproduction of an enzyme called phosphodiesterase type 5. It degrades the substances responsible for the blood flow to the penis. If there is too much phosphodiesterases, member falls prematurely, even if a man is excited. Contained in sildenafil inhibits the harmful enzyme and maintain a blood vessel in the expanded state. This enables the strengthening and extension of an erection. works for approx. 4 hours. This does not mean that for such a long time member will continue in erection. 4 hours is the time in which a result of sexual .