There are only three oral drugs approved by the FDA to treat erectile dysfunction: Cialis, Levitra, and
Viagra. All work by increasing the flow of blood into the penis so that when a man is sexually stimulated, he can get an erection. Cialis, Levitra, and Viagra work by a similar mechanism to cause erections. There are subtle differences in how long the drug works and how quickly it works. Levitra works a little longer than Viagra. They both take effect in about 30 minutes. With Levitra, the effects last for about 5 hours. With Viagra, the effects last approximately 4 hours. Cialis works a bit faster (within about 15 minutes), and the effects last much longer - up to 36 hours in some cases.

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