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Cialis belongs to a group of medications called phosphodiesterase 5 (PDE5) inhibitors. And when you have more cyclic GMP, the blood vessels and muscles in your penis relax. Cyclic guanosine monophosphate (GMP) is a chemical in your body that relaxes the muscles in the penis and increases blood flow into the penis. With ED, this activity isn’t working properly, so you can’t have or maintain an erection. Cialis is approved to treat erectile dysfunction (ED), symptoms of benign prostatic hyperplasia (BPH), or both of these conditions.
The full study population was 87% White, 2% Black, 11% other races