In respiratory units without morphine-induced depression, 9 out of 86 were inhibited by tolazoline, and 1 out of 92 was excited by cyproheptadine.

• 全身应用吗啡前，在86个吸气性单位中，妥拉苏林引起阻遏的只有9个;在92个吸气性单位中，赛庚吮引起兴奋的只有1个。