| Word | Definitions | Synonyms |
|---|---|---|
| nalorphine | (noun) a narcotic antagonist (trade name Nalline) that counteracts the effects of narcotics (especially the effects of poisoning by morphine) | Synonyms: Nalline |
| naloxone | (noun) a potent narcotic antagonist (trade name Narcan) especially effective with morphine | Synonyms: Narcan |
| naltrexone | (noun) an oral antagonist against the action of opiates | - |