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Sildenafil Citrate(Viagra )Cas139755-83-2

Sildenafil Citrate(Viagra )Cas139755-83-2

Product Name:Sildenafill citrate
Synonyms: Sildenafill; 171599-83-0; Powder
CAS: 171599-83-0
MF: C28H38N6O11S
MW: 666.7
Package: 1KG/bag
Assay: 99%

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Product Details

Let's first look at what is sildenafil and vardenafil?

They are all phosphodiesterase type 5 (PDE5) inhibitors, sildenafil and vardenafil referred to as "PDE5 inhibitors".

Sildenafil Citrate(Viagra )Cas139755-83-2 (the original research drug) is a drug produced by Pfizer. It was quickly approved by the US FDA for listing in 1998 and was launched in my country in July 2000.

Vardenafil was jointly developed by Bayer of Germany and GlaxoSmithKline. It was approved by the U.S. FDA in August 2003. It was launched in the U.S. as a drug for the treatment of erectile dysfunction. It was approved to enter the Chinese market on December 30, 2005. In 2015, it was approved to enter my country's pharmaceutical retail market.

Vardenafil is 5 years later than Sildenafil Citrate(Viagra )Cas139755-83-2.Vardenafil is called the second generation PDE5 inhibitor. The first generation is sildenafil. The third generation is tadalafil. However, the market share of vardenafil is much less than that of the other two. However, from my communication with some patients, I found that those who have used vardenafil felt that the effect was very good.

Do you know which is better from sildenafil or vardenafil? I will do some analysis from the following 4 aspects

1. From the perspective of pharmacokinetics, vardenafil is faster than sildenafil:

2.drug pharmacokinetics of Sildenafil tabs :

Sildenafil Citrate(Viagra )Cas139755-83-2 can take effect as fast as 30 minutes after administration, and the time to reach its peak is about 60 minutes; the efficacy window is about 4 hours.

Vardenafil is quickly absorbed after oral administration. Some men can reach the maximum blood concentration within 15 minutes after taking the drug. For 90% of men, the maximum blood concentration can be reached 30-120 minutes after taking the drug on an empty stomach (median time: 60 min). Concentration of the drug; the effective window period is about 6-12 hours.

Vardenafil is indeed better than sildenafil, and it is absorbed very quickly after oral administration, which greatly reduces the waiting time. In addition, the effect lasts longer than sildenafil tabs.


2. From the perspective of absolute bioavailability, sildenafil is better:

The absolute bioavailability of sildenafil is about 40% and vardenafil is 15%. The low bioavailability may cause the effective concentration of the drug to be difficult to predict, unstable, and at the same time after the drug is absorbed into the blood. Increase the risk of interaction with other drugs.


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