this medication is used to help relieve moderate to severe pain. Hydromorphone belongs to a class of drugs known as opioid (narcotic) analgesics.
Hydromorphone, also known as dihydromorphinone, and sold under the brand name Dilaudid among others, is an opioid used to treat moderate to severe pain. Long term use is typically only recommended for pain due to cancer. It may be used by mouth or by injection into a vein, muscle, or under the skin