Morphine binds strongly to opiate receptors in the brain to produce analgesia.In vitro studies on opiate receptors show that the quaternary salt of morphine also binds strongly.

• 吗啡通过与大脑中的阿片受体紧密粘合产生止痛作用,在体外研究中，阿片受体与吗啡的季盐也有强力的粘合作用。