In the drop-down in the inventory option, offer a 'how many vials' option, rather than just the individual units of insulin, as the use of penfill reservoirs of insulin makes counting individual units in a vial difficult, plus the added un-counted units purged to release air bubbles makes this measurement system liable to fault. Furthermore, this buildup of more insulin lost than recorded could cause those who rely on the inventory system to run out of medication early than predicted and put pressure on pharmacies to provide emergency prescriptions.