Opioid prescription fill rates after emergency department discharge.

PURPOSE: Opioid prescription fill rates and the time to fill after emergency department (ED) discharge were studied.

METHODS: Data were evaluated for all patients discharged from the ED between September 1, 2011, who were February 1, 2012, who were diagnosed with one of the following: dental pain, jaw pain, flank pain, abdominal pain, pelvic pain, back pain, neck pain, knee pain, headache, fracture, or sprain. Clinical information was abstracted via computer algorithm, and prescription filling within 100 days of prescription writing was determined by cross-referencing patient demographics with the state prescription drug monitoring program. Logistic regression analysis and a Cox proportional hazards model were used to determine if any clinical and demographic characteristics were associated with fill rates or the time to fill, respectively.

RESULTS: Of the 2243 patients who received an opioid prescription at ED discharge, 1775 (79%) filled it, with a median time to fill of 0 days. On adjusted analysis, characteristics associated with filling the opioid prescriptions included Caucasian race, being insured by the federal government or through a state indigent assistance program, a chief complaint of back pain, and a history of filling an opioid prescription within the past year. No characteristics were predictive of a prolonged time to filling.

CONCLUSION: One in five patients who received an opioid prescription at discharge from an urban academic ED did not fill it. Several factors may be associated with a greater likelihood of filling, such as insurance status and history of filling an opioid prescription within the past year.