Trimeperidine
Trimeperidine (trade name Promedol) is an opioid analgesic that is an analogue of prodine.It was developed in the early 1950s in the USSR during research into the related drug pethidine.[3][4] It is around half the potency of morphine as an analgesic,[5][6] and has been widely used for the treatment of pain.Trimeperidine is in Schedule I of the Controlled Substances Act 1970 of the United States as a Narcotic with ACSCN 9646 with an annual aggregate manufacturing quota of 2 grams as of 2014.The free base conversion ratio for salts includes 0.883 for the hydrochloride.