Viagra (also known as Sildenafil) and Levitra (also known as Vardenafil) are both used in the treatment of erectile dysfunction. These drugs work by blocking the actions of the enzyme called PDE5. This would likely make a person believe that all were equal and technically it is a matter of preference because there is no scientific evidence to substantiate that one is more effective than another.

It is known that there is a difference in dosing as the maximum recommended dosage for Viagra is 100mg the maximum dosage for Levitra is 20 mg. In terms of equivalency, taking 20mg of Levitra is comparable to taking 100mg of Viagra.

It is very common for men to report that they had a preference of one medication over another. While some loved Viagra, others loved Levitra even though they all work essentially the same way, there are enough differences to account for variations in how well the drugs work in particular individuals. Both Levitra and Viagra work in about an hour and both will produce an erection once stimulated for about four hours. Both drugs have essentially the same side effects. Both drugs are safe when used as directed for most men. Men taking nitrate drugs (such as Isordil, ISMO, or nitroglycerin) should not take either drug.

Both Levitra and Viagra work very well as these medications increase the satisfaction with the hardness of erections and maintain the erection throughout intercourse. Once intercourse is over, the erection goes away. Depending on why you are suffering from erectile dysfunction will depend largely on how well you respond to the medication. With disorders such as poorly controlled diabetes it is possible that the disorder might interfere with how well the medications will work.

When a man becomes sexually stimulated, his brain sends out nerve signals, which cause a release of a chemical called nitric oxide. This chemical relaxes muscles in the penis to allow more blood to flow in, causing a hard, erect penis. These drugs help enhance the effects of the nitric acid (Health A-Z). Both Viagra and Levitra are taken orally and should only be taken once daily.

Both of these medications should be dispensed at the discretion of a physician that has had an opportunity to look over your medical history so that he is able to determine if you are a good candidate for taking erectile dysfunction drugs that contain PDE5 inhibitors.