PT - JOURNAL ARTICLE ED - , TI - Personal medical information cards AID - 10.1136/dtb.9.5.18 DP - 1971 Feb 26 TA - Drug and Therapeutics Bulletin PG - 18--20 VI - 9 IP - 5 4099 - http://dtb.bmj.com/content/9/5/18.short 4100 - http://dtb.bmj.com/content/9/5/18.full SO - Drug Ther Bull1971 Feb 26; 9 AB - Continuity of medical care was once relatively simple and mattered less when therapies were not so specific and incisive. Today a patient on prolonged therapy could be exposed to a considerable number of potentially dangerous interactions should any physician, surgeon or anaesthetist alter the treatment when ignorant of the previous therapy. This is a particular hazard during holidays, dental treatment and accident surgery. The differential diagnosis of an unconscious patient in the hospital accident department is made more difficult by a lack of knowledge about his previous history and therapy. In the absence of authentic information mistakes are difficult to avoid.