The Physicians' Desk Reference (PDR), renamed Prescriber's Digital Reference after its physical publication was discontinued, is a compilation of manufacturers' prescribing information (package insert) on prescription drugs, updated regularly and published by ConnectiveRx.
While marketed as a means of providing physicians with the full legally mandated information relevant to writing prescriptions, it was widely available in libraries and bookstores, was widely used by other medical specialists, and was sometimes valuable to the layman.
[2] Medical Economics Inc. merged with Reinhold Publishing in 1966 to form Chapman-Reinhold.
[3] Litton Industries, which owned the American Book Company, acquired Chapman-Reinhold in 1968.
[4] Litton sold its publishing business to the International Thomson Organization (ITO) in 1981.