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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]
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 hypertension. [2] Vardenafil and tadalafil were discovered in 1990.
Sildenafil Drug Interactions A word on sildenafil drug interactions: Mixing antihypertensive prescription drugs (hypertension meds) with Viagra may cause low blood pressure.
The PDUFA date thus serves as a 'best estimate' of when a decision on a New Drug Application or a Biologics License Application would be forthcoming. This response may be a decision to approve the application or a Complete Response Letter (CRL). The PDUFA date may be extended by the Food and Drug Administration in certain circumstances. [6]
Viagra’s main ingredient sildenafil is part of a class of drugs referred to as PDE5 inhibitors, which (unlike non-prescription supplements) are approved by the FDA for the treatment of ED.
Vardenafil (Levitra) Vardenafil is the active ingredient in Levitra, and the FDA approved it in 2003. It’s similar to sildenafil but lasts longer — research suggests it provides better blood ...
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.