Penile erection is caused by the engorgement of the penis with blood. this engorgement occurs when the blood vessels delivering blood to the penis increase in size and increase the delivery of blood to the penis. at the same time, the blood vessels carrying blood away from the penis decrease in size and decrease the removal of blood from the penis. sexual stimulation that leads to the engorgement and erection causes the production and release of nitric oxide in the penis. nitric oxide then activates the enzyme, guanylate cyclase to produce cyclic guanosine monophosphate (cgmp). the cgmp is primarily

The breakdown and elimination of tadalafil from the body may be decreased by erythromycin, ketoconazole (nizoral), itraconazole (sporanox), indinavir (crixivan) and ritonavir (norvir). therefore, these drugs may increase the concentration of tadalafil (tadalafil) in the blood. if these drugs are being used at the same time as tadalafil (tadalafil), the dose of tadalafil should be reduced in order to avoid side effects from high levels of tadalafil.

Tadalafil increases the heart

The breakdown and elimination of tadalafil from the body may be decreased by erythromycin, ketoconazole (nizoral), itraconazole (sporanox), indinavir (crixivan) and ritonavir (norvir). therefore, these drugs may increase the concentration of tadalafil (tadalafil) in the blood. if these drugs are being used at the same time as tadalafil (tadalafil), the dose of tadalafil should be reduced in order to avoid side effects from high levels of tadalafil.

Tadalafil increases the heart

tadalafil is not approved for use in pregnant women. cialis has not been evaluated in women who are breastfeeding.

The most common tadalafil side effects are facial flushing (reddening), headaches, stomach upset, diarrhea, flu-like symptoms and nausea.

tadalafil also may cause chest pain, low blood pressure, blurred vision and changes in color vision, abnormal ejaculation and priapism (prolonged and painful erection).