CIALIS 40mg contains the active substance tadalafil which belongs to a group of medicines called phosphodiesterase type 5 inhibitors. Following sexual stimulation CIALIS works by helping the blood vessels in your penis to relax, allowing the flow of blood into your penis. The result of this is improved erectile function. 

Tadalafil Uses
Tadalafil is used for erectile dysfunction.

How Tadalafil works
An inhibitor of phosphodiesterase (PDE-5) is tadalafil. It treats erectile dysfunction by relaxing the muscles in the penile blood arteries, which increases blood flow to the penis. It aids in reducing urinary symptoms in patients with benign prostatic hyperplasia (BPH) by relaxing the muscles in the bladder and prostate gland. 

Common side effects of Tadalafil
Flushing (sense of warmth in the face, ears, neck, and trunk), Headache, Blurred vision, Muscle pain, Upset stomach, Rash

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