Sildenafil CAS:139755-83-2

Usage: Viagra (Sildenafil citrate) is a drug used to treat erectile dysfunction (impotence) in males and pulmonary arterial hypertension (PAH).

Sildenafil citrate, sold as Viagra, Sildenafil is an oral drug for the treatment of ED, used in the treatment of erectile dysfunction and premature ejaculation, erectile function impairment and premature ejaculation has very significant improvements. There are over 1500 documents to prove the caused by different causes impotence premature ejaculation,knew the success rate is above 80%, and show its reliable curative effect, through the use of more than 20 million people worldwide, proved its long-term stability, the safety of 25 to 60 minutes of work function to coincide with a time needed for foreplay, knew the time adjustment in the highest drug concentration time, help both husband and wife a satisfactory sex life.

The primary indication of sildenafil is treatment of erectile dysfunction (inability to sustain a satisfactory erection to complete intercourse). Its use is now standard treatment for erectile dysfunction in all settings, including diabetes.It acts by inhibiting cGMP-specific phosphodiesterase type 5 (PDE5), an enzyme that promotes degradation of cGMP, which regulates blood flow in the penis.

As well as erectile dysfunction, sildenafil citrate is also effective in the rare disease pulmonary arterial hypertension. It relaxes the arterial wall, leading to decreased pulmonary arterial resistance and pressure. This, in turn, reduces the workload of the right ventricle of the heart and improves symptoms of right-sided heart failure. Because PDE5 is primarily distributed within the arterial wall smooth muscle of the lungs and penis, sildenafil acts selectively in both these areas without inducing vasodilation in other areas of the body. Pfizer submitted an additional registration for sildenafil to the United States Food and Drug Administration (FDA), and sildenafil was approved for this indication in June 2005. The preparation is named Revatio, to avoid confusion with Viagra, and the 20-mg tablets are white and round. Sildenafil joins bosentan and prostacyclin-based therapies for this condition.