Like it or not, the ability to produce a firm erection on demand is a pretty important component of men’s identity—both to us and to our sexual partners.
So when that ability wanes (as is the case for more than 30 million American men who suffer from erectile dysfunction–ED), many guys make a mad dash to the nearest doctor to get medical help. That help often comes in a bottle containing one of three prescription drugs: Viagra (sildenafil), Levitra (vardenafil), or Cialis (tadalafil).
These drugs, when taken as directed, usually produce the desired effect, which is great. But it’s possible to have too much of a good thing: Taking excessive amounts of these drugs or mixing them with other medications could kill you.
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