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Viasil is also one of the most expensive products we ve researched as well, at a whopping 75 for a one month supply, and offers a 100 day money back guarantee. Sildenafil is a potent and selective inhibitor of cGMP specific phosphodiesterase type 5 in the corpus cavernosum, where PDE5 is responsible for degradation of cGMP. It is also recommend that these medications not be consume if they are kept in an unsanitary environment.