Erectile Dysfunction is defined as the consistent inability to attain and maintain an erection sufficient for sexual intercourse. ED affects an estimated 189 million men worldwide. Experts believe that 80 percent to 90 percent of ED cases are related to a physical or medical condition, such as diabetes, cardiovascular diseases, and prostate cancer treatment, while 10 percent to 20 percent are due to psychological causes. In many cases, however, both psychological and physical factors contribute to the condition.

Lilly ICOS LLC, a joint venture between ICOS Corporation and Eli Lilly and Company, developed Cialis for the treatment of erectile dysfunction. ICOS Corporation, a biotechnology company headquartered in Bothell, Washington, is dedicated to bringing innovative therapeutics to patients. ICOS is working to develop treatments for serious unmet medical conditions such as benign prostatic hyperplasia, pulmonary arterial hypertension, cancer and inflammatory diseases.

When an erection goes limp, you have PDE5 to thank . Specialized penis tissue produces a substance called cyclic guanosine monophosphate (cGMP) in response to sexual stimulation. The more cGMP available, the more durable the erection. Cialis inhibits the PDE5 enzyme, preserving cGMP levels, therefore aiding erection viability and durability. Cialis (tadalafil), an oral treatment for erectile dysfunction, is a selective inhibitor of cyclic guanosine monophosphate (cGMP)-specific phosphodiesterase type 5 (PDE5). Tadalafil has the empirical formula C 22 H 19 N 3 O 4 representing a molecular weight of 389.41.

We all know that Cialis isn't the first oral treatment medicine for erectile dysfunction. It came after Viagra and Levitra. However both Viagra and Levitra works for up to 5-6 hours, while Cialis gives you 36 hours to enjoy sex. All three drugs should take about 30-40 minutes to take action. No longer does an erection or sexual activity have to be rushed. If you Expect to go to a Bar and meet a girl, you probably wouldn't want to take Viagra or Levitra and get a really hard erection after 40 minutes, because you don't know how things would go, Instead you can take Cialis before you go out, and you should be on the safe side of the erection, even if you decide to spend the night.

To conclude, Viagra and Levitra would probably be better to one certain sexual encounter with your wife, while Cialis is a better choice for a whole weekend of sex, or for a night at some pick-up bars, seeking random sex partners, without the certainty of Sex. For a comprehensive overview and comparison of all 3 drugs, as well as prices at selected pharmacies, you should visit http://www.compare-medicine.com>Compare-Medicine.com


About the Author
John M. Davidson is the founder of http://www.compare-medicine.com>Compare-Medicine.com. In the age of 39, after he first discovered that he had Erectile Dysfunction, and began seeking for treatment, he decided to make it easier for other men like himself to find the best solution.