Erectile dysfunction: Cialis, Viagra and Levitra to treat ED
Vardenafil increases the body's ability to achieve and maintain an erection during sexual stimulation.
Levitra pill helps increase blood flow to the penis
 
The three leading oral drugs that are FDA approved for treating erectile dysfunction are Viagra, Cialis and Levitra. They all work by inhibiting the enzyme that attacks the cyclic GMP in your body which allows the increase of blood flow in the penis and trap them. So when a man is stimulated sexually, he can get erection.

They all work similarly, the only difference is how quickly it works and how long will it last.

 

Viagra, Cialis, Levitra

 
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Levitra and Viagra both take effect about 30 minutes of intake while Cialis takes effect within 15 minutes of intake. Also Cialis wins hands down in the lasting game; it can last up to 36 hours while Viagra can only last up to 4 hours and Levitra 5 hours.

If one of these drugs does not work for you, chances are the other two will not either. They all work the same way so it would be unlikely that you will have adequate erection in one drug when you failed in the two.