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Also tell them if you smoke, drink alcohol, or use illegal drugs. Once aroused, a natural chemical is released, which the PDE5 inhibitors rely on to work with. Once this natural chemical is released, a chain reaction begins, relaxing the smooth muscle inside the penis. There is then an increase in blood flow into the penis allowing the penis to can become erect. It belongs to the group of drugs known as phosphodiesterase type 5 inhibitors, or PDE5 inhibitors.

Antihypertensive medications themselves have also been implicated in ED (20). In this study, men taking concomitant antihypertensive medications had greater improvements in erectile function with tadalafil at 20 mg than those not taking antihypertensives. These results may indicate that men with more severe endothelial dysfunction derive a greater benefit from the NO-potentiating effect of tadalafil at 20 mg.

The full study population was 87% White, 2% Black, 11% other races