What science gives, it sometimes takes away. And if you take three or more medications daily, you may have to add Viagra or Cialis to the list, as well. A Kaiser Permanente study published in the British Journal of Urology International reveals a direct relationship between the number of medications taken by a man and his risk of erectile dysfunction. The first conclusion you might draw from such a study would be that the other health issues for which the medications were prescribed are to blame. But researchers say they've already accounted for the impact of conditions like hypertension, obesity, high cholesterol, diabetes, smoking and depression on wood growth and it's still worse among those taking three or more medications a day. In fact, old age was demonstrated to have a lesser effect on erectile function than med count. So before you contemplate an ED treatment like Viagra, consider lightening the fistful of existing meds you're already taking first.