The official coroner's report lists "cardiac arrhythmia" as the cause of Presley's death, but this was later admitted to be a ruse entered into by the Presley family along with autopsy physicians Dr. Jerry T. Francisco, Dr. Eric Muirhead and Dr. Noel Florredo to cover up the real cause of death, a cocktail of ten prescribed drugs, taken in doses no doctor would prescribe:
The painkillers Morphine and Demerol.
Chloropheniramine, an antihistamine.
The tranquilizers Placidyl and Valium.
Finally, four drugs were found in "significant" quantities: Codeine, an opiate, Ethinamate, largely prescribed at the time as a "sleeping pill," Quaaludes, and a barbituate, or depressant, that has never been identified.
It has also been rumored that Diazepam, Amytal, Nembutal, Carbrital, Sinutab, Elavil, Avental, and Valmid were found in his system at death.
The phrase "cardiac arrhythmia," in the context of the coroner's report, means little more than a stopped heart; the report initially tried to attribute the arrhythmia to cardiovascular disease, but Elvis' own personal physician has stated that Presley had no such chronic problems at the time. Most of Elvis' many health problems can and have been traced back to rampant abuse of prescription drugs.
Elvis had visited his dentist on August 15th to have a temporary crown put in; it has also been suggested that the codeine the dentist gave him that day resulted in an anaphylactic shock that assisted in his death. (He had suffered allergic reactions to the drug previously.)