This study also has several limitations that may explain why we did not find an effect ofmedication reconciliation at hospital admission on direct patient outcomes. First, the primarycomposite outcomewas assessed regardless of the causes that led to a hospital revisit within 30 daysfrom discharge. This choice could have masked the real proportion of hospital revisits that occurredbecause of medication-related harms. Although hospital revisits that occurred because ofmedication-related harms were likely rare, they could have reasonably happened within 30 daysfrom discharge, when patients were likely still using the medications they were using at discharge.Owing to the limited human resources available, medication discrepancies identified in theintervention group were not assessed for their clinical relevance in potentially causing an adversedrug event.