When sildenafil (Viagra) was introduced fifteen years ago, it revolutionized the treatment of male sexual dysfunction. For one thing, this important but intensely personal issue came out from under the covers. Men began to approach sexual woes as medical problems, not personal failings. For another, the problem got a new and more accurate name: Erectile dysfunction (ED) replaced impotence, a term that comes from the Latin for “loss of power.” Above all, sildenafil and its rivals, vardenafil (Levitra, Staxyn), tadalafil (Cialis) and avanafil (Stendra), provide effective and safe treatment for about 70% of men with ED…

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