• Home
• About us
• Contact

Cialis comparison levitra viagra

Posted by Maria

July 25, 2005, 11:30 pm

[TEXT-10-15] cialis comparison levitra viagra!-Online-Approved pharmacy:yesterday, today and tomorrow [MAP]

• Comments

Doctor Steave: June 13, 2005, 7:18 pm

Missi: July 1, 2005, 9:06 pm
To whom to sell the cialis comparison levitra viagra 2008 offer? Write on mine e-mail or call.

Maria: July 6, 2005, 9:36 pm

Doctor Steave: July 15, 2005, 10:30 pm
A: So-called generic cialis comparison levitra viagra pills you purchase on the internet may

Ketty: July 22, 2005, 11:12 pm
In whom it is possible to order the cialis comparison levitra viagra? Who can help?

Paul: July 25, 2005, 11:30 pm
It is possible to order the cialis comparison levitra viagra on mail?

The drug company Pfizer makes Viagra; Eli Lilly and Company makes Cialis. WebMD asked both companies for their comments on their drug's label change.

Title with a link - Example of heading 2

Erection of the penis is caused by the filling of the penis with blood. Filling occurs because the blood vessels that bring blood to the penis increase in size and deliver more blood to the penis, and, at the same time, the blood vessels that take blood away from the penis decrease in size and remove less blood from the penis. Sexual stimulation that leads to an erection causes the production and release of nitric oxide in the penis. The nitric oxide causes an enzyme, guanylate cyclase, to produce cyclic guanosine monophosphate (cGMP). It is the cGMP that is primarily responsible for increasing and decreasing the size of the blood vessels carrying blood to and from the penis, respectively, and causing the erection. When the cGMP is destroyed by another enzyme, phosphodiesterase-5, the blood vessels return to their normal size, blood leaves the penis, and the erection ends. Tadalafil prevents phosphodiesterase-5 from destroying cGMP so that cGMP stays around longer. The persistence of cGMP leads to a more prolonged engorgement of the penis with blood.