Pain
"My husband had surgery to remove his prostate gland, bladder, and 12 inches of colon six months ago. He was hospitalized for nine days. His lower-back pain was excruciating, and morphine (controlling it himself) and various types of mattresses did nothing to make him comfortable. He was getting no sleep at all until the surgeon offered Dilaudid. It lasted for about 5 hours or so, and he could have it every 6 hours. It brought quick relief to the back pain and relaxed him enough to get decent amount of sleep after several days of terrible discomfort. No side effects for him either."