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Brand names for this medication are Adcirca®, ALYQ® and Cialis®. CIALIS 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.

There are a few side effects that may experienced with tadalafil. Talk to your doctor, nurse, or pharmacist if you have concerns about these side effects. Do not take a higher dose of tadalafil than your provider orders for you.

The full study population was 87% White, 2% Black, 11% other races