There are several prescription erection pills are available, including Viagra, Cialis and Levitra. Viagra was the first impotence pill and is still by far the best known. It is a powerful potency pill that should be taken before sex. Cialis was below the market. The main advantage of Cialis is the long duration of action, the effect lasts up to 36 hours. The variant Cialis Once a Day swallowed daily and ensures that you do not have to plan sexual intercourse. It makes a spontaneous sex life possible. Levitra has the advantage of fast operation. Within 15 minutes the erection occurs, allowing you to experience sexual intercourse without problems. Below you will find information about the various erection pills.