Erectile dysfunction (ED) occurs when a man can't get or maintain an erection firm enough for sex. There are several prescription medications on the market now that treat this condition: sildenafil (Viagra), verdenafil (Levitra, Staxyn), tadalafil (Cialis), and avanafil (Stendra). These prescription medications for ED are almost the same price and Viagra is one of the more popular choices.
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