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The drug known as anti-impotence drug Viagra actually minimizes men's fertility by minimizing the ability of their sperm to fertilize an egg, according to a study made by researchers at Queen's University Belfast and published in the journal Fertility and Sterility.

Researchers carried out two various experiments to distinguish what are the effects the popular drug might have on sperm cells. In the initial study, human sperm samples were bathed in weak Viagra solutions, intended to approximate the blood concentration achieved from taking a single 100-milligram Viagra pill. They found that while the Viagra-bathed sperm became increasingly active, they also suffered damage to the structure at their heads also known as the acrosome. This part of the cell contains enzymes that aids break down the membrane around an egg so that the sperm can penetrate it.

To find out if this cell damage actually affected fertility rates, the researchers compared the fertility of two groups of male mice, one of which had been given Viagra. They found out that mice in the Viagra group produced 40 percent less than fertilized embryos than mice that had not been given any drugs.

Researcher David Glenn stated that the many fertility clinics that prescribe Viagra in order to increase the number of sperm counts may actually be endangers the fertility of their clients.

I think it is much worrying that some in-vitro fertilization clinics are using Viagra to be able to boost fertility results, Glenn said. Couples that undergo for some treatment are, by definition, already having some problems getting pregnant. Giving male partners something that could make the problem even worse is scarcely the right approach.

Glenn also expressed concern over the long-term adverse effects that recreational Viagra use might have on patient’s fertility.

Viagra has become a popularly known and used recreational drug, Glenn said. It is mixed together with cocaine, for example, and is sold in clubs.