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Your review page says that ejaculation is sympathetically controlled, while erection is parasympathetically controlled…if so, why does an alpha 1 antagonist like phenoxybenzamine cause impotence (inability to maintain an erection)?

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Your review page says that ejaculation is sympathetically controlled, while erection is parasympathetically controlled…if so, why does an alpha 1 antagonist like phenoxybenzamine cause impotence (inability to maintain an erection)?

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You are correct alpha1-agonists can stimulate ejectulation, whereas alhpa1-antangonists such phenoxybenzamine can inhibit it. This is a peripheral action. The effect on impotence is a centrally mediated action.

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