Cialis is a brand name for Tadalafil, a medication used to treat erectile dysfunction (ED), benign prostatic hyperplasia (BPH), and sometimes pulmonary arterial hypertension. Cialis 20 mg is commonly prescribed for ED. Tadalafil is a phosphodiesterase type 5 (PDE5) inhibitor. It works by relaxing blood vessels, increasing blood flow to the penis during sexual stimulation, which helps achieve and maintain an erection.

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