Main Page | See live article | Alphabetical index Hydromorphone is a drug used to relieve moderate to severe pain. It belongs to a category of drugs known as opioid analgesics. It is commonly given to patents who have recently undergone surgery or who have suffered serious injury, and it is given intravenously, intramuscularly, or orally. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.