Cialis is a medicine taken by mouth for the treatment of erectile dysfunction (ED) in men. ED is a condition where the penis does not harden and expand when a man is sexually excited, or when he cannot keep an erection. Cialis may help a man with ED get and keep an erection when he is sexually excited.

Erectile dysfunction is a complex health condition and Cialis is one of many treatments (medically speaking) that may help treat it. Cialis should be taken when you wish to have sex and may help you achieve and maintain an erection with sexual stimulation such as visual or physical sexual stimulation. Whether infrequent or regular impotence is symptomatic of a patient Cialis may be beneficial, however as mentioned earlier it has not been approved as a treatment for women.

Cialis tablets contain the active ingredient tadalafil. Tadalafil is called a phosphodiesterase type 5 inhibitor, and works by preventing the action of a chemical in the body called phosphodiesterase type 5. An erection is produced via a complex chain of events, involving signals from the nervous system and the release of chemical messengers within the tissues of the penis. One of these chemical messengers is called cyclic GMP. Cyclic GMP causes the blood vessels in the penis to widen by relaxing a thin layer of muscle found in the blood vessel walls. This allows more blood to enter the penis, which ultimately results in the penis becoming rigid and erect.

Cyclic GMP is normally broken down by another chemical in the body called phosphodiesterase type 5. Tadalafil works by preventing the action of phosphodiesterase type 5, thus stopping the breakdown of cyclic GMP. This means that the blood vessels are kept dilated for longer, improving blood flow to the penis and maintaining an erection.

As tadalafil enhances the actions of the chemical messengers responsible for producing an erection, it will only work once these messengers are present. This means that sexual stimulation is required for it to produce and maintain an erection.