Importance Prescription opioids play an important role in the treatment of post-operative pain, yet unused opioids may be diverted for non-medical use and contribute to opioid-related injuries and deaths. Objective To quantify how commonly post-operative opioids are unused, why they remain unused, and practices regarding their storage and disposal after surgery. Evidence Review We searched PubMed, EMBASE, and Cochrane Central Register of Controlled Trials from inception to 18 October 2016 for studies describing opioid over-supply for adults after any surgery or procedure. We defined our primary outcome, opioid over-supply, as the number of patients with either filled prescriptions with unused opioids or unfilled opioid prescriptions. Two reviewers independently screened studies for inclusion, extracted data, and assessed study quality. Findings Six eligible studies reported on a total of 810 patients (range 30–250) undergoing seven different procedure types. Across the six studies, between two-thirds (67%) to nine-tenths (92%) of patients reported unused opioids. Among opioids obtained by surgical patients, 42% to 71% of all tablets went unused. A majority of patients stopped or used no opioids due to adequate pain control, while 16% to 29% of patients reported opioid-induced side effects. In two studies examining storage safety, 73% to 77% of patients reported that their prescription opioids were not stored in locked containers. All studies reported low rates of anticipated or actual disposal, while no study reported FDA-recommended disposal methods in more than 9% of patients. Conclusions & Relevance Post-operative prescription opioids often go unused, unlocked, and undisposed, suggesting an important reservoir of opioids contributing to non-medical use of these products.

ObjectiveTo quantify the effects of varying opioid prescribing patterns after surgery on dependence, overdose, or abuse in an opioid naive population.DesignRetrospective cohort study.SettingSurgical claims from a linked medical and pharmacy administrative database of 37 651 619 commercially insured patients between 2008 and 2016.Participants1 015 116 opioid naive patients undergoing surgery.Main outcome measuresUse of oral opioids after discharge as defined by refills and total dosage and duration of use. The primary outcome was a composite of misuse identified by a diagnostic code for opioid dependence, abuse, or overdose.Results568 612 (56.0%) patients received postoperative opioids, and a code for abuse was identified for 5906 patients (0.6%, 183 per 100 000 person years). Total duration of opioid use was the strongest predictor of misuse, with each refill and additional week of opioid use associated with an adjusted increase in the rate of misuse of 44.0% (95% confidence interval 40.8% to 47.2%, P<0.001), and 19.9% increase in hazard (18.5% to 21.4%, P<0.001), respectively.ConclusionsEach refill and week of opioid prescription is associated with a large increase in opioid misuse among opioid naive patients. The data from this study suggest that duration of the prescription rather than dosage is more strongly associated with ultimate misuse in the early postsurgical period. The analysis quantifies the association of prescribing choices on opioid misuse and identifies levers for possible impact.

Procedure-specific prescribing recommendations may help provide guidance to clinicians who are currently overprescribing opioids after surgery. Multidisciplinary, patient-centered consensus guidelines for more procedures are feasible and may serve as a tool in combating the opioid crisis.