We found that among older patients treated with clopidogrelafter acute ischemic stroke or TIA, concomitant use of a PPIwas not associated with a significantly increased short-termrisk of readmission for stroke. To our knowledge, this is thefirst study to examine the potential effect of PPI therapy onrecurrent stroke risk in patients treated with clopidogrel forsecondary stroke prevention.Although in vitro studies suggest that some PPIs, inparticular omeprazole, can attenuate the antiplatelet activityof clopidogrel,6,25 our findings suggest that this potential druginteraction is of little clinical consequence in patients withcerebrovascular disease. This observation differs from previously published research by our group9 and others10,11 inpatients with acute coronary syndromes