When Oxybutynin Becomes a Decoy for Oxycodone: A Case Report of Diversion Through Substitution

This case report describes the novel use of oxybutynin and acetaminophen as a substitution for oxycodone for the express purpose of diverting oxycodone in a hospital-based post-anesthesia care unit (PACU). The report outlines how the physical properties and pharmacologic effects of non-controlled medications in the PACU, like oxybutynin, can be visually mistaken and even mimic the side effects of controlled substances like oxycodone. Substituting oxybutynin for controlled substances can circumvent diversion surveillance software. The authors describe how the diversion was identified and the process improvements that should be implemented for proactive identification moving forward.