Dimethylthiambutene is the synthetic narcotic analgesic agent. It has analgesic effect similar to those of meperidine. Dimethylthiambutene clinically compared with meperidine (pethidine), but maintains the dependence-producing capability of morphine. It has had illicit use in Japan in the past. Dimethylthiambutene is under international control according to the UN Single Convention 1961 and its amendments, Schedule I.

Dimethylthiambutene:
https://drugs.ncats.io/drug/915D88LM9O

Dimethylthiambutene was developed in the United Kingdom in the late 1940s. An opioid pain reliever most often used in veterinary medicine in Japan.