According to Wikipedia:George Nichopoulos, also known as "Dr. Nick," was Elvis Presley's personal physician. He began treating Elvis in 1967, and took it on as a full time job in 1970 until Elvis' death in 1977.
In 1977 alone, Dr. Nick had prescribed 10,000 doses of amphetamines, barbiturates, narcotics, tranquilizers, sleeping pills, and laxatives for Presley. He says he did it because he 'cared'
Blood tests showed traces of 14 different drugs in Elvis's body at the time of his death.
In 1995 Nichopoulos had his license permanently suspended by the Tennessee Board of Medical Examiners, after it was revealed that he had been over prescribing to numerous patients for years.
After he was stripped of his credentials in 1995, Dr Nick took a job evaluating medical insurance claims by FedEx employees, where he still works today, paying off his many legal bills.
References:
Doctor Feelgood. The Observer, Sunday, August 11, 2002.
Rock Idol Elvis Presley Dies at 42. Washington Post, Thursday, August 17, 1977.
Image source: Dr.Nick - ο έλληνας γιατρός του Ελβις.