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Sildenafil (Viagra) treats erectile dysfunction, but a small study published in May suggests that the drug might impair male fertility. Semen samples from 57 men were exposed to the same concentrations of sildenafil present in the blood 30 minutes after taking a 100-milligram pill. They found that the drug made sperm more active and caused premature activation of an enzyme needed for the penetration of an egg, potentially thwarting fertilization. The researchers note that their findings conflict with those of some previous ...