Jeremy is diagnosed with erectile dysfunction, and his doctor prescribes tadalafil to treat his condition. How is tadalafil likely to help Jeremy?
A. Tadalafil will increase the blood pressure in the penis by acting as a vasoconstrictor.
B. Tadalafil will alter psychomotor activity and increase nerve excitability so that an erection is established and maintained.
C. Tadalafil will increase the blood flow to the penis by acting as a vasodilator.
D. Tadalafil will selectively block PDE5 in the penis so that cGMP accumulates and a full erection is maintained.
Answer: D
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