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Chemical structure of sildenafil (Viagra), the prototypical PDE5 inhibitor. A phosphodiesterase type 5 inhibitor (PDE5 inhibitor) is a vasodilating drug that works by blocking the degradative action of cGMP-specific phosphodiesterase type 5 (PDE5) on cyclic GMP in the smooth muscle cells lining the blood vessels supplying various tissues.
The inhibitor is highly selective for the PDE5 family. [22] Sildenafil is a prototype of PDE5 inhibitors that Pfizer launched as Viagra. It was approved by the Food and Drug Administration (FDA) in 1998 as the first oral medicine for erectile dysfunction. Later, in the year 2005, it was approved for the treatment of pulmonary arterial ...
Sildenafil is a potent and selective inhibitor of cGMP-specific phosphodiesterase type 5 (PDE5), which is responsible for degradation of cGMP in the corpus cavernosum. The molecular structure of sildenafil is similar to that of cGMP and acts as a competitive binding agent of PDE5 in the corpus cavernosum, resulting in more cGMP and increased ...
This is thanks to an enzyme called phosphodiesterase type 5 (PDE5). Viagra inhibits PDE5 and acts as a vasodilator (something that dilates blood vessels and increases blood flow).
Viagra and Other PDE5 Inhibitors Viagra isn’t the only PDE5 inhibitor on the market. In fact, the FDA has approved three other PDE5 inhibitors to help treat the symptoms of ED:
Viagra could lead to more serious side effects, such as: Priapism (a painful, long-lasting arousal) ... and a healthcare professional will explain that phosphodiesterase type 5 inhibitors aren’t ...
Inhibitors of PDE can prolong or enhance the effects of physiological processes mediated by cAMP or cGMP by inhibition of their degradation by PDE. [13] Sildenafil (Viagra) is an inhibitor of cGMP-specific phosphodiesterase type 5, which enhances the vasodilatory effects of cGMP in the corpus cavernosum and is used to treat erectile dysfunction.
PDE5 inhibitors like sildenafil may not be safe for people who have existing heart problems. It's unclear if it is safe in among people who have had a heart attack, stroke or irregular heartbeat ...