Etoxeridine (Carbetidine, Atenos) is a 4-phenylpiperidine derivative that is related to the clinically used opioid analgesic drug pethidine (meperidine).

Etoxeridine was developed in the 1950s[2] and investigated for use in surgical anesthesia, however it was never commercialized and is not currently used in medicine.

[3][4][5] As with other opioids which were not in clinical use during the drafting of the Controlled Substances Act, it is categorized as a Schedule I narcotic.

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