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Structural formula of benzethidine
Ball-and-stick model of the benzethidine molecule
Clinical data
ATC code none
Legal status
Legal status
CAS Number 3691-78-9
PubChem (CID) 62516
DrugBank DB01518 YesY
ChemSpider 56290 YesY
Chemical and physical data
Formula C23H29NO3
Molar mass 367.481 g/mol
3D model (Jmol) Interactive image

Benzethidine is a 4-phenylpiperidine derivative that is related to the opioid analgesic drug pethidine (meperidine, or Demerol).[1]

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.[2] In the United States, the drug us a Schedule I Narcotic Controlled Substance with a DEA ACSCN of 9606 and 2014 annual aggregate manufacturing quota of nil.[3] The most common salt in use is the hydrochloride, free base conversion ratio of 0.910


  1. ^ Maul C, Buschmann H, Sundermann B. Opioids: 3.3 Synthetic Opioids. Analgesics 2005; 159-169. ISBN 978-3-527-30403-5
  2. ^ Cahal DA, Dare JG, Keith D. A Sequential Trial of Analgesics in Labour. International Journal of Obstetrics and Gynaecology 1961; 68(1): 88–93.
  3. ^