Choosing erectile dysfunction drugs

There are four main FDA-approved erectile dysfunction (ED) drugs: sildenafil (Viagra), tadalafil (Cialis), vardenafil, and avanafil (Stendra). While all ED drugs work the same way, they differ in how quickly they act (from 15 to 45 minutes) and how long the effect lasts (from six to 36 hours). Which one is the best choice for a man depends on his lifestyle and whether he takes medication that ED drugs may interfere with.