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Viagra, the commercial name of sildenafil, is a potent inhibitor of type 5 phosphodiesterase specific to cyclic GMP, the enzyme that in turn degrades the cyclic monophosphate guanosine (cyclic GMP), the compound responsible for filling the penis with blood. In many cases of erectile dysfunction, the problem is that the activity of said enzyme does not allow sufficient cyclic GMP plasma levels to activate the erection, which is caused by the massive entry of blood. Viagra solves this problem temporarily and therefore promotes erections, let's call them, chemical. Online pharmacy offers you to purchase viagra from www.pillmerit.com over the counter with fast delivery.