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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’s role as a PDE5 inhibitor might help prevent the thickening of heart muscles, a feature that makes it difficult to pump blood. Viagra has also shown real promise for increasing the ...
Sildenafil (Viagra), tadalafil (Cialis) and vardenafil (Levitra) typically start working within 30 to 60 minutes, while avanafil (Stendra) works within 15 to 30 minutes. As with most prescription ...
Sildenafil is the OG prescription medication for ED. It came onto the market in the late ’90s under the brand name Viagra. For several years, it was the only medication available for men with ED.
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.
However, it remains difficult for a patient to ascertain whether an online pharmacy is legitimate. Medicines obtained from rogue online pharmacies come with no guarantees concerning their identity, history, and source. A study in three cities in the Netherlands found that over 60% of the consumed sildenafil was obtained from illegal sources. [12]
When to Take Viagra: 30-60 Minutes Before Intimacy, Not Earlier. If you’re planning to have intimacy, it’s best to take your recommended dose of Viagra ahead of time.
Homosildenafil (also known as methyl-sildenafil) is a synthetic drug which acts as a phosphodiesterase inhibitor. [1] It is an analog of sildenafil and vardenafil . Homosildenafil was first identified as an adulterant in sex enhancement products in 2003 and was more recently detected in dietary supplements.