Li Ka Shing Knowledge Institute, St. Michael's Hospital, Toronto, Canada; Institute for Clinical Evaluative Sciences, Toronto, Canada; Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, Canada. Electronic address: [Email]
Rising use of prescription opioids is a major public health concern associated with increased risk of mortality worldwide. Fentanyl, a synthetic opioid available in patch form, is particularly concerning given its high potency. To curb the misuse and diversion of fentanyl patches, a Patch-for-Patch (P4P) program was implemented in some counties in Ontario between 2012 and 2015. The program requires that patients prescribed fentanyl must return used patches to the pharmacy before receiving more patches.