https://medixway.com/pain-relief/dilaudid/Hydromorphone is an opioid medication that treats severe pain by blocking pain signals in your brain. The brand name of this medication is Dilaudid®. This medication comes in a tablet form that you can take by mouth with a glass of water as directed.It is prescribed when other pain medications have not worked or cannot be tolerated. It works by blocking pain signals in the brain. It belongs to a group of medications called opioids.This medicine may be used for other purposes; ask your health care provider or pharmacist if you have questions.