Morphine hydrochloride injection is a potent analgesic, a pure opioid agonist, with strong analgesic effects, also has a significant sedative effect, and has a certain coughing effect, has a certain inhibitory effect on the central system, can cause a decrease in the responsiveness to carbon dioxide tension, an overdose may lead to respiratory failure and death. In addition, it also has the effect of excitation of smooth muscle and enhancement of intestinal smooth muscle tone, which may also lead to constipation, and can cause peripheral vasodilation, and has a certain effect of pupil reduction and antiemetic, the mechanism of action is mainly through the combination with opioid receptors, so as to produce the corresponding effect, morphine injection in clinical is mainly as a strong analgesic, usually for other This drug is a controlled substance and must be used in accordance with the relevant regulations.