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In many of these studies, the researchers found more than 10 percent of men having intimacy with men used sildenafil citrate — and that its use is associated with higher risks of unprotected ...
Sildenafil, sold under the brand name Viagra among others, is a medication used to treat erectile dysfunction and pulmonary arterial hypertension. [ 4 ] [ 8 ] It is also sometimes used off-label for the treatment of certain symptoms in secondary Raynaud's phenomenon . [ 9 ]
After further trials, sildenafil citrate was approved by the Food and Drug Administration (FDA) in 1998 as the active ingredient in brand name Viagra, now a very well-known drug for ED.
The study found that about 80 percent of these pills were counterfeit, and while the fake Viagra pills contained the active ingredient, sildenafil citrate, the amount was only 30 percent to 50 ...
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.
On March 27, 1998, sildenafil citrate was approved by the Food and Drug Administration (FDA) for the treatment of ED. The approval of Sildenafil transformed the way America talked about a topic that was once very private before. [2]
Generic sildenafil (and brand-name Viagra) is a medication for the treatment of ED, Raynaud’s phenomenon, and pulmonary arterial hypertension. To understand how Viagra works, we need to look at ...
The difference between the vardenafil molecule and sildenafil citrate is a nitrogen atom's position and the change of sildenafil's piperazine ring methyl group to an ethyl group. Tadalafil is structurally different from both sildenafil and vardenafil. Vardenafil's relatively short effective time is comparable to but somewhat longer than ...