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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.
These phosphodiesterase inhibitors are used primarily as remedies for erectile dysfunction, as well as having some other medical applications such as treatment of pulmonary hypertension. Dipyridamole also inhibits PDE5. This results in added benefit when given together with nitric oxide or statins.
PDE5 inhibitor drugs are effective in men regardless of why they have erectile dysfunction — including vascular disease, nerve problems, and even psychological causes. [citation needed] PDE5-inhibiting drugs can cause a number of side-effects, including headache, lightheadedness, dizziness, flushing, nasal congestion, and changes in vision.
Drugs that inhibit PDE5, sildenafil, tadalafil and vardenafil, have been used as treatment for erectile dysfunction. [16] These inhibitors increase the cGMP, smooth muscle relaxation and consequently cause penis erection [9] during sexual stimulation. [17]
All four of the oral medications listed above belong to a class of drugs called PDE5 inhibitors, which work by inhibiting the effects of the enzyme phosphodiesterase type 5 (PDE5).
This page was last edited on 9 February 2024, at 00:17 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.
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