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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.
