Introduction Dilaudid is a derivative of morphine. The active ingredient present in Dilaudid is Hydromorphone Hydrochloride. Despite both of them belonging to the opioid analgesic drugs, Dilaudid is two to eight times stronger than the morphine. Dilaudid and morphine both of them are used for the treatment of moderate to severe pain. Both of them can be used for the treatment of the cough reflex, But people mostly buy Dilaudid online as a prescribed medicine to effectively cure chronic body pain and muscle spasms. Working of Dilaudid and Morphine : Working principle of Dilaudid is quite simple: The hydromorphone hydrochloride drug present in Dilaudid can manipulate the brain and nervous system's response to pain. Dilaudid tends to stimulate receptors on nerves present in the brain to increase the pain-bearing threshold, therefore reducing the perception of pain. Morphine also works similar to Dilaudid.