Cialis is a prescription medication that is used to treat erectile dysfunction (ED) and benign prostatic hyperplasia (BPH). It is a phosphodiesterase type 5 (PDE5) inhibitor, which means that it works by blocking the breakdown of cyclic guanosine monophosphate (cGMP). cGMP is a chemical that helps to relax the muscles in the penis, which allows for blood flow and an erection.
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