Buy Dilaudid Online. Dilaudid is a derivative of morphine. This is actually Hydromorphone(dihydromorphinone) sold under the brand name Dilaudid among others. It is a centrally acting pain medication of the opioid class. Hydromorphone is to morphine as hydrocodone is to codeine. Dilaudid is a narcotic. Hydromorphone(Dilaudid) is bitter and hydrophilic like most opiates, not lipophilic, so it is absorbed poorly and slowly through mouth membranes. It is more soluble in water than morphine.