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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.
Phosphodiesterase 5 is widely expressed in several tissues in the body for example brain, lung, kidney, urinary bladder, smooth muscle and platelets. [1] It is possible to prevent cGMP hydrolysis by inhibiting PDE5 and therefore treat diseases associated with low cGMP levels, because of this, PDE5 is an ideal target for the development of ...
Cyclic guanosine monophosphate-specific phosphodiesterase type 5 is an enzyme (EC 3.1.4.17) from the phosphodiesterase class. It is found in various tissues, most prominently the corpus cavernosum of the clitoris and of the penis as well as the retina. [5] It has also been recently discovered to play a vital role in the cardiovascular system.
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).
Phosphodiesterase-5. A phosphodiesterase inhibitor is a drug that blocks one or more of the five subtypes of the enzyme phosphodiesterase (PDE), thereby preventing the inactivation of the intracellular second messengers, cyclic adenosine monophosphate (cAMP) and cyclic guanosine monophosphate (cGMP) by the respective PDE subtype(s).
These all belong to a class of medications referred to as PDE5 inhibitors. They work by increasing blood flow to your privates, making it easier to get and stay hard when you feel aroused.
BUT be careful — like tadalafil, vardenafil, and other phosphodiesterase type 5 inhibitors, Viagra should be prescribed and taken under the medical advice of a healthcare professional.
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.
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