benzethidine benzethidine benzethidine is a 4-phenylpiperidine derivative that is related to the clinically used opioid analgesic drug pethidine (meperidine, or demerol). benzethidineclinical dataatc codenonelegal statuslegal status au: s9 (prohibited substance) ca: schedule i de: anlage i (authorized scientific use only) uk: class a us: schedule i identifiers iupac name ethyl 1-- 4-phenylpiperidine- 4-carboxylate cas number3691-78-9 ypubchem cid62516drugbankdb01518 ychemspider56290 yuniix0i74bar02chemblchembl2104234 ncomptox dashboard (epa)dtxsid50190389 chemical and physical dataformulac23h29no3molar mass367.489 g·mol−13d model (jsmol)interactive image smiles o=c(occ)c3(c1ccccc1)ccn(ccocc2ccccc2)cc3 inchi inchi=1s/c23h29no3/c1-2-27-22(25)23(21-11-7-4-8-12-21)13-15-24(16-14-23)17-18-26-19-20-9-5-3-6-10-20/h3-12h,2,13-19h2,1h3 ykey:uvtbzawtrvbtmk-uhfffaoysa-n y ny (what is this?) (verify) benzethidine is not currently used in medicine and is a class a/schedule i drug which is controlled under un drug conventions. it has similar effects to other opioid derivatives, such as analgesia, sedation, nausea and respiratory depression. in the united states, the drug is a schedule i narcotic controlled substance with a dea acscn of 9606 and 2014 annual aggregate manufacturing quota of nil. the most common salt in use is the hydrochloride, free base conversion ratio of 0.910 legal status australia benzethidine is considered a schedule 9 prohibited substance in australia under the poisons standard (february 2017). a schedule 9 substance is a substance which may be abused or misused, the manufacture, possession, sale or use of which should be prohibited by law except when required for medical or scientific research, or for analytical, teaching or training purposes with approval of commonwealth and/or state or territory health authorities.