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OBJECTIVE: To investigate the risk of incident myocardial infarction, congestive heart failure, and all cause mortality associated with prescription of oral antidiabetes drugs. DESIGN: Retrospective cohort study. SETTING: UK general practice research database, 1990-2005. PARTICIPANTS: 91,521 people with diabetes. MAIN OUTCOME MEASURES: Incident myocardial infarction, congestive heart failure, and all cause mortality. Person time intervals for drug treatment were categorised by drug class, excluding non-drug intervals and intervals for insulin. RESULTS: 3588 incident cases of myocardial infarction, 6900 of congestive heart failure, and 18,548 deaths occurred. Compared with metformin, monotherapy with first or second generation sulphonylureas was associated with a significant 24% to 61% excess risk for all cause mortality (P |