The anti-impotence drug.

[gefttrummor]

The anti-impotence drug <b>viagra</b> actually reduces men's fertility by decreasing the ability of their sperm to fertilize an egg, according to a study conducted by researchers at Queen's University Belfast and published in the journal Fertility and Sterility.
Researchers carried out two different experiments to determine what effect the popular drug might have on sperm cells. In the first study, human sperm samples were bathed in weak <b>viagra</b> solutions, intended to approximate the blood concentration acquired from taking a single 100-milligram <b>viagra</b> pill. They found that while the <b>viagra</b>-bathed sperm became more active, they also suffered damage to the structure at their heads known as the acrosome. This portion of the cell contains enzymes that help break down the membrane around an egg so that the sperm can penetrate it.

[Jkahsd]

Hi,About five per cent of trial patients taking Cialis reported side effects including headaches and heartburn. Viagra is not recommended for men with heart conditions who are taking drugs that lower blood pressure or who are recommended not to have sex because of their heart condition, and Cialis will carry similar warnings. But other men with heart disease can safely take the drugs, says Lilly.