Clopidogrel and interaction with proton pump inhibitors: comparison between cohort and within person study designs.

There was limited evidence of a slight increase in the risk of myocardial infarction in the two week period before exposures of interest began (incident rate ratio 1.39 (0.71 to 2.70) for periods before exposure to proton pump inhibitors), although this failed to reach significance (table 7 ).

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