Erectile Dysfunction: Cialis, Viagra and Levitra to Treat ED

There are only three oral medications 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.

What Are the Differences Between Cialis, Levitra, and Viagra?

Cialis, Levitra, and Viagra work by a similar mechanism to cause erections. There are subtle differences in how long the medication 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. If One of These medications Isn’t Effective for Erectile Dysfunction, Can I Try Another?
Yes, but because these medications work the same way, it’s unlikely that you’ll have success with one if you’ve failed to achieve an adequate erection with another.

What Precautions Should I Take Before Taking One of These medications?

There are certain situations in which these medications may not be safe to take. Before taking them, tell your doctor:

If you are allergic to any medications, including Viagra or other ED medications. About any prescription or nonprescription medications you are currently taking, including herbal and dietary supplements. If you are scheduled for surgery, including dental surgery. If you take nitroglycerin or a long-acting nitrate to treat chest pain. The combination of Cialis, Levitra or Viagra with these medications can cause dangerously low blood pressure. If you take alpha-blockers for blood pressure or prostate problems. The combination of Cialis or Levitra with these medications can also cause dangerously low blood pressure. In addition, always follow the directions on your prescription label carefully and ask your doctor or pharmacist to explain any part that you do not understand. Take these medications exactly as directed. Do not take more or less or take it more often than prescribed by your doctor. Do not take these medications more than once a day.