【答】当用肾上腺素α受体阻断药(如酚妥拉明)后,对抗了肾上腺素的血管收缩作用,使它只能发挥β-受体兴奋作用,单独地表现血管扩张作用,使血压下降。这样,原来产生升压作用的肾上腺素剂量转为产生降压作用的现象称为“肾上腺素作用的翻转”(Adrenaline reversal)。所以,氯丙嗪由于 [Answer] When using adrenergic alpha-receptor blockers (eg, phentolamine) counteract the vasoconstrictor effect of epinephrine, allowing it to exert a beta -receptor agonistic effect alone as a vasodilator, Lower blood pressure. In this way, the original dose of epinephrine to produce a depressor effect is called “Adrenaline reversal”. So, chlorpromazine due