The disclosed system identifies an unused medication and a current location of the unused medication, and determines that a new medication order can be prepared using the unused medication. Responsive to determining that the new medication order can be prepared using the unused medication, the system provides a preparation instruction to prepare the new medication order using the unused medication, determines a current geolocation of a global positioning system (GPS) receiver of a mobile device associated with a delivery person, the mobile device being remote from the one or more computing devices, determines based on the current geolocation of the GPS receiver of the mobile device and the unused medication, that the unused medication should be retrieved by the delivery person before or instead of a second medication, and provides, to the mobile device, an indication to retrieve the unused medication.