Cialis more drug side effects
Posted by John
July 2, 2005, 9:12 pm
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[MAP]
NIKI: January 26, 2005, 5:30 am
Maria: January 28, 2005, 5:42 am
is or how much is present. You might be paying for a 20 mg dose but only
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__________________
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Otec: May 19, 2005, 4:48 pm
larry: May 24, 2005, 5:18 pm
John: June 12, 2005, 7:12 pm
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Paul: June 22, 2005, 8:12 pm
Doctor Steave: July 2, 2005, 9:12 pm
getting 7mg or 8mg. Or you might be getting a dangerously high dose
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.
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.
