sentences:  Hydroxypethidine has similar effects to other opioids, and produces analgesia, sedation and euphoria.Side effects can include itching, nausea and potentially serious respiratory depression which can be life-threatening.Hydroxypethidine is under international control under the Single Convention on Narcotic Drugs 1961 and therefore controlled like morphine in most countries; in the United States it is a Schedule I Narcotic controlled substance with an ACSCN of 9627 and a 2014 annual aggregate manufacturing quota of 2 grams.