When the toxicology report came back several weeks later, however, Elvis' blood was found to contain very high levels of the opiates Dilaudid, Percodan, Demerol, and codeine — as well as Quaaludes. The other two pathologists Muirhead and Florredo eventually revealed they also had found evidence of severe and chronic constipation, diabetes, and glaucoma during their examination.
Elvis actually died a death that is quite common, albeit an embarrassing one. Elvis was sitting on the toilet, straining very hard to have a bowel movement — a maneuver that put a great amount of pressure on his heart and aorta. Thus, he likely died of a massive heart attack and keeled over onto the floor. But Elvis was not suffering from garden-variety constipation at the time of his death. Indeed, his medicine chest was filled with amber-colored, white-topped vials of medications, in doses no responsible doctor would have prescribed.
Presley was a long-time abuser of opiates, which not only kill pain but also cause savage constipation. He abused antihistamines, tranquilizers such as Valium, barbiturates, Quaaludes, sleeping pills, hormones — and laxatives, for the constipation.