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*** [[Sildenafil]] (Viagra) ...(physiology)|Flushing]] may be a physiological response to vasodilators. [[Viagra]], a [[phosphodiesterase]] inhibitor, works to increase blood flow in the p

...inhibitors (PDE-i) have been employed with excellent results. Sildenafil (Viagra) increases intracellular cGMP by inhibiting PDE-type 5, which is abundant i

...07784}}</ref> In the Netherlands two chemical analogs of [[Sildenafil]] ([[Viagra]]) were found in adulterated marijuana.<ref name="pmid18945564">{{cite jour