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The similarities of Viagra, Levitra and Cialis are numerous. They all function as phosphodiesterase-5 (or PDE-5 for short) inhibitors and the medical names of these drugs are sildenafil for Viagra, vardenafil for Levitra and tadalafil for Cialis. In fact all three drugs work in the same way namely by preventing the breakdown of the all important nitric oxide in the blood vessels. Nitric oxide is a compound that allows the blood vessels to relax and open in the penis so that blood can flow and an erection can be created. If the nitric oxide is plentiful enough the blood vessels stay open and the erection will be sustained for a long time.

A common myth is that is you take these drugs (PDE-5 inhibitors) you will automatically get an erection. This is not the case as unless sexual stimuli are present the mechanism of blood flowing to the penis can start. The erectile dysfunction drugs just enable the whole process to work better and faster and the great thing about them is that they boost erections irrespective of the reason for the impotence in the first place. Viagra, Levitra and Cialis in clinical tests have been shown to produce a bigger amount of erections and sexual experiences for a longer period in all men with erectile dysfunction from many different causes such as diabetes, spinal cord damage, depression and even those having prostate cancer.

While the drugs are basically the same their manufacturers are keen to differentiate them and argue for the efficacy of their own drugs. Some people prefer Viagra for example for being the original product and others might prefer Cialis for the length of time of works for. The manufacturers in fact deliberately have added different chemical compounds to the active agents so that they react differently and over a different length of time. However so far no serious study has been conducted to actually compare the efficacy of the three PDE-5 inhibitors directly.

Cialis is fast becoming referred to as The Weekend Pill as it can last for 36 hours and is also the only erectile dysfunction drug that can be taken with food. Viagra is often preferred as it the most researched and best selling impotence drug in the world and Bayer, the manufacturers of Levitra say that it is lighter on the stomach than other the other erectile dysfunction drugs.

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