Trimeperidine (promedol) is the earliest and mostly studied opioid analgesic. Trimeperidine stimulates opioid receptors in the central nervous system. Compared with morphine, it has a weaker and shorter analgesic effect, less affects the respiratory, vomiting and vagal centers, does not cause smooth muscle spasm (except for the myometrium), and has a moderate antispasmodic and hypnotic effect. It is used to treat severe pain syndrome, acute left ventricular failure, pulmonary edema, cardiogenic shock, preparation for surgery, childbirth, high fever, post-transfusion complications, poisoning with atropine, barbiturates, barium, gasoline, boric acid, strong acids, carbon monoxide, turpentine, formalin, formalin. It has several side effects. Administration of this substance is associated with the development of life-threatening conditions accompanied by the suppression of respiration center. Analgesic trimeperidine (promedol) was included into the health care kits by various Ministries of the Russian Federation at different times.

Trimeperidine:
https://drugs.ncats.io/drug/1M2IB31DTS