Ketobemidone

Ketobemidone (Cliradon, Ketogan, Ketodur, Cymidon, Ketorax, &c.) is a powerful opioid analgesic. Its effectiveness against pain is in the same range as morphine, and it also has some NMDA-antagonist properties imparted by its metabolite norketobemidone. This makes it useful for some types of pain that don't respond well to other opioids. The most commonly cited equalisation ratio for analgesic doses is 25 mg of oral ketobemidone hydrobromide to 60 mg of morphine hydrochloride or sulphate and about 8 mg of ketobemidone by injection and 10 mg of morphine.