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Cialis, also known by its generic name tadalafil, is a prescription medication used to treat erectile dysfunction (ED) and the symptoms of benign prostatic hyperplasia (BPH). ED is a condition where a man is unable to achieve or maintain an erection firm enough for sexual intercourse, while BPH is a condition where the prostate gland enlarges, causing difficulty with urination.
Cialis belongs to a class of drugs called phosphodiesterase-5 (PDE5) inhibitors. PDE5 is an enzyme that breaks down cyclic guanosine monophosphate (cGMP), a molecule that relaxes smooth muscles. By inhibiting PDE5, Cialis increases the levels of cGMP in the smooth muscles of the blood vessels in the penis, causing them to relax and allowing more blood to flow into the penis. This increased blood flow results in an erection.