Dilaudid (hydromorphone) is an opioid medication for pain. It is a hydrogenated ketone of morphine contains dihydromorphine, and helps treat moderate to severe pain. It is under the recommendation for long-term use only in pain caused by cancer. Dilaudid is a crystalline powder of white color that is freely soluble in water.Buy Dilaudid online from a trusted online pharmacy without hassle. Compare the rate at which the medicine is available at different sites. Before buying the drug.