Medication discrepancies during care transition were common. Many factors contribute to the risk of medication discrepancies. Despite medication reconciliation service being practiced in the hospital setting, there was limited knowledge on its effectiveness in the primary care setting. This study aims to evaluate the effectiveness of a pre-consultation medication reconciliation service in reducing medication discrepancies in patients who transit from hospital to primary care. Adult patients who made their first visit to the polyclinics following a recent hospital discharge and were prescribed with 5 or more chronic medications were randomised to 2 groups. Pre-consultation medication reconciliation by a pharmacist was carried out for the intervention group. Outcome was assessed by a different pharmacist who was blinded to the randomised allocation. The control group underwent usual care without a pre-consultation medication reconciliation.