Consumer Reports (October 2007) discusses a small study that suggests Viagra might impair male fertility.
"Semen samples from 57 men were exposed tot he same concentrations of sildenafil (Viagra) 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 findings conflict with those of some previous studies, so it’s uncertain how definitive the results of this small study are. What I found interesting about the article is that the use of erectile drugs among men ages 18 to 45 has soared. Most of the ads you see on TV portray older gentlemen, but apparently, younger men are frequently using the drug "recreationally."
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