Dilaudid 4 mg is a strong opioid medication that contains hydromorphone, primarily used to manage moderate to severe pain, particularly when other pain relievers just aren't cutting it. It works quickly by attaching to opioid receptors in the brain and spinal cord, which helps to significantly lessen the feeling of pain. Typically, Dilaudid 4 mg is prescribed for short-term use or as part of a carefully monitored long-term pain management strategy.