<unk>  (trade name Meptid) is an opioid analgesic developed by Wyeth in the 1970s. Indications for use in moderate to severe pain, most commonly used to treat pain in obstetrics (childbirth). A partial µ-opioid receptor agonist, its mixed agonist/antagonist activity affords it a lower risk of dependence and abuse than full µ agonists like morphine.<unk>  exhibits not only a short onset of action, but also a shorter duration of action relative to other opioids such as morphine, pentazocine, or buprenorphine.
It does not appear in the US Controlled Substances Act 1970; it may or may not be regulated as an analogue of controlled relatives such as proheptazine (ACSCN 9643)
Meptazinol
Viminol
Drotebanol
Nifurtoinol
Gedocarnil
Cinnarizine
Dexpanthenol
Undecylenic acid