Main Page | See live article | Alphabetical index An opioid analgesic (also known as a narcotic analgesic) is a drug used in the treatment of pain that acts on specific receptors within the CNS. Drugs in this classification include codeine (a moderately potent analgesic) and morphine (a potent one). natural opium alkaloids morphine opium hydromorphone nicomorphine oxycodone dihydrocodeine diamorphine papaveretum codeine phenylpiperidine derivatives ketobemidone pethidine fentanyl diphenylpropylamine derivatives dextromoramide piritramide dextropropoxyphene bezitramide dextropropoxyphene benzomorphan derivatives pentazocine phenazocine oripvaine derivatives buprenorphine morphinan derivatives butorphanol nalbufine other opioids tilidine tramadol dezocine See also pharmacology This article is a stub. You can help Wikipedia by fixing it. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.