Erectile dysfunction can occur for a number of reasons, either physical, psychological or a combination of the two. Physical causes are related to a breakdown in the process of erection, and can occur anywhere along the pathway from the brain to the spine, nerves, muscles, tissues or veins and arteries of the penis.

The normal process of erection begins in the brain, when the imagination or one or more senses are stimulated and arousal occurs. The central nervous system sends nerve impulses that increase blood flow to the penis. There are four requirements for a normal erection:

1) properly functioning nervous system that sends the necessary signals to the penis;

2) an intact system of blood vessels to allow blood to flow into and out of the penis;

3) normal smooth muscle in the penis (this must relax so the penis can fill with blood and enlarge) and;

4) the ability to trap the blood in the penis so that it stays firm.

The pharmaceutical industry has developed a number of effective medications - Viagra, Cialis and Levitra, aimed at helping impotent men achieve erection. They may have dangerous side effects, and men with certain medical conditions or taking other medications should not use these drugs.

Cialis is now with you even if you are living a very fast life. There are a lot of pharmacies which offer you an easy way to get the Cialis Online and keep your privacy, if you are too much worried about your private life.