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Almost one-fifth of medications supplied to medical and surgical wards and emergency departments (EDs) in Melbourne public hospitals were not administered to patients, according to research published by the .

An analysis of electronic pharmacy drug management system and medication administration data for 20 frequently used medications in each of four public hospitals in Melbourne during 2019 found that almost one-fifth (19.2%) of units were not administered to patients, with the greatest amount of the unaccounted for drugs useful for self-medication.

Professor David Taylor, Director of Emergency Medicine Research at in Melbourne, and colleagues investigated the nature, extent and cost of discrepancies between the quantities of medications supplied to medical departments and those administered to patients in public hospitals in Melbourne.

鈥淐onsiderable quantities of medications are not accounted for in public hospitals,鈥� Taylor and colleagues wrote.

鈥淏efore the adoption of electronic medication records, assessing the extent of the problem required labour-intensive audits.

鈥淒ifferences for medications useful for self-treatment or for treatment of friends or family, such as oral antibiotics, were relatively high,鈥� Taylor and colleagues reported.

鈥淥ur findings were also consistent with other reports that discrepancies were higher for oral than equivalent parenteral (non-oral) medications, whereby those for parenteral preparations were probably attributed to wastage.鈥�

Although they did not specifically investigate the reasons for the discrepancies, Taylor and colleagues wrote that their findings and others worldwide suggested that 鈥渕edication discrepancies are partially explained by theft, typically for self-treatment鈥�.

鈥淒iversion of controlled medications by hospital staff has been described, particularly in peri-operative areas of hospital practice.

鈥淭he generally low discrepancy rates for controlled substances in our survey were encouraging, but the high rates for oxycodone and temazepam at individual hospitals are concerning and require elucidation.

鈥淭he large discrepancies for ED medications we found probably have several causes,鈥� they wrote.

鈥淢edication is often transferred from EDs to other wards or services, bypassing supply and administration systems, particularly outside normal working hours, when a medication may not be immediately available on a particular ward.

鈥淧atients discharged to hospital in the home may be given parenteral medications to ensure continuity of treatment before a definitive source is secured, and doctors may provide discharged patients with starter packs or complete courses of medication instead of prescriptions.

鈥淔urther, prescription medications are occasionally supplied from the ED medication imprest instead of the after-hours medication facility for discharged patients.

鈥淭he relatively hectic environment and larger staff numbers in EDs may also contribute to discrepancies.鈥�

Other possible explanations for discrepancies include failure to document medication administration, failure to document verbal orders, temporary unavailability of the medication record system, undocumented preparation and administration errors, changes in imprest medication levels, stock recalls, spillage, waste and medication expiry.

鈥淲e recommend that the integrity of electronic medication supply and administration data be validated, comparing electronic with manual audit data,鈥� Taylor and colleagues concluded.

鈥淩easons for medication discrepancies should be examined to facilitate development of appropriate targeted interventions, including staff education, strict administration sign-off procedures and audit, and improved tracking of medication transferred to wards, given to patients or other services, or not used for other reasons.

鈥淐ameras in medication rooms could be considered, and procedures for averting diversion and harmonising supply and use reviewed.

鈥淥ur findings highlight the importance of monitoring discrepancies between electronic medication supply and administration data to improve the detection and prevention of medication loss.鈥�

Image credit:聽漏stock.adobe.com/au/fizkes