Cialis works by enhancing the effects of one of the chemicals the body normally releases into the penis during sexual arousal. The main active ingredient in Cialis is Tadalafil which inhibit the PDE-5 enzyme. This allows an increase of blood flow into the penis and it acts faster than Viagra.



FDA has approved Cialis for the treatment of men who experience difficulty having and maintaining an erection (impotence). Although there are some other drugs also on the market for this indication, this drug is different because it may work up to 36 hours after dosing. Due to its long lasting effects Cialis is most popular in whole world.

Approximately 5% of trial patients taking Cialis reported side effects including headaches and heartburn which are very less in compare to other Erectile Dysfunction drugs. Viagra is not recommended for men with heart conditions who are taking drugs that lower blood pressure or who are recommended not to have sex because of their heart condition, and Cialis will carry similar warnings. But other men with heart disease can safely take the drugs, says Lilly.

Cialis works exactly like Viagra with only one difference. Cialis has the ability to target the PDE5 receptors better. PDE5 enzymes control different actions of cells in the body including the brain, heart and eyes. If these receptors are not targeted effectively, certain side effects of cialis can occur such as blurred vision, headaches, nausea, and/or heart complications. Don't worry, if you notice these side effects suddenly but if these side effects continue for long time then immediately consult with your doctor.

It also works for more people. In clinical trials Viagra, was found to work for 75% of people that tried it. Under the same test conditions Cialis was found to work for 88% of men that tried it. Researchers claim it works twice as fast as Viagra with fewer side effects.