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Millions of men in the United States suffer from erectile dysfunction, or ED, at some point in their lives. In fact, one in 10 men will experience some level of ED. It's no longer a hush-hush subject; there are many prescription options to help attain the results that you'd like to have. With so many commercials and ads for ED drugs, you may be wondering what differences there are between the different medications and how they work.

When you are going to buy Cialis, Viagra, or Levitra at your local pharmacy, know that all these drugs work in basically the same way. To understand this, it's important to understand the physiology behind male arousal. When a man is stimulated, blood begins to pump into the penile tissue, which is made of muscles and spongy materials. The blood will fill this tissue. The blood vessels become wide open, allowing blood to pour into the spongy material, causing swelling, or an erection. A chemical called phosphodiesterase type 5, or PDE5, is responsible for causing an erection to go down, or reverse. Cialis, Levitra, and Viagra work to inhibit PDE5, which gives the user the ability to maintain his erection. A man must be stimulated for any of these medications to work.

The differences between each drug lies in the amount of time that passes before the user sees results and how long each medication stays in effect. Levitra and Viagra will be best absorbed if taken on an empty stomach. These will normally take half an hour to 45 minutes to produce results and will continue to be effective for up to six hours. Cialis isn't hampered by food in the stomach, and it only takes about 15 minutes for the user to see results. However, it will last up to 36 hours once ingested. Knowing the differences can make choosing an ED medication much easier.