11/7/08

Viagra: molecule of the week

Sildenafil, marketed as its citrate salt under the trade name Viagra, is the leading drug for treating erectile dysfunction. It was originally developed by Pfizer for treating pulmonary hypertension and angina pectoris. After scientists noticed that it produced penile erections, Pfizer patented it for this use in 1996 and received U.S. Food and Drug Administration approval for sale in 1998.
Chemical formula: C22 H30 N6 O4 S 
Name:1-[[3-(6,7-dihydro-1-methyl-7-oxo-3-propyl-1H-pyrazolo[4,3-d]pyrimidin-5-yl)-4-ethoxyphenyl]sulfonyl]-4-methylpiperazine citrate

9 comments:

Dr.Shirley said...

The penis shape and erection angle vary from man to man - there is no normal shape or size and the average erection is roughly horizontal from the body. Most men cannot reach orgasm more than once in about an hour and most have between one and four orgasms per week, depending on their age http://www.viagrathunder.com

viagra said...

The drug war between the anti-impotency medicines such as Viagra, Cialis and Levitra is continuously on the rise but instead of preferring the other two erectile dysfunction drugs Cialis and Levitra, impotency afflicted men are opting for viagra only, the Pfizer manufactured drug to treat erectile dysfunction. This is because Viagra if the first erectile dysfunction medication to provide men successful relief from impotency and to known more about tidbits on Viagra, please visit the website http://www.viagraforce.com

sandra said...

I decided to buy viagra as sexual dysfunction treatment last month. Now I can see the change. And now my wife wants a sweet moon again at the beach and Florida is not a bad idea.

SundayRose said...

Propecia the first and only pill to treat Androgenetic Alopecia, was developed to treat Male Pattern Hairloss in the vertex (top of head) and anterior mid-scalp area. Propecia is proven to maintain or increase hair count in most men.

mollyabraham said...

Levitra is a phosphodiesterase inhibitor. This medication is used to help men with erectile dysfunction to have an erection. The result is achieved by relaxing muscles and helping the blood flow into the penis. The medication is not a protection against sexually transmitted diseases.

mollyabraham said...

Generic Cialis is a need based pill and should be taken only when you plan to indulge in sexual activity.

johnnysmith said...

Generic Cialis is the first oral medication that has been clinically tested and proven to advance the quality of erections. Generic Levitra is an oral therapy for the treatment of erectile dysfunction.

Leo said...

Need a catalyst to reach the height of the sex life….Try out Viagra sample to check its effectiveness. Free Viagra sample generally available with the physician or in certain online/offline drug stores for trial.

generic vaigra 100mg said...


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