PT  - JOURNAL ARTICLE
AU  - Jonathan S. Zipursky
AU  - Karl Everett
AU  - Tara Gomes
AU  - J. Michael Paterson
AU  - Ping Li
AU  - Peter C. Austin
AU  - Muhammad Mamdani
AU  - Joel G. Ray
AU  - David N. Juurlink
TI  - Prescription of oxycodone versus codeine after childbirth and risk of persistent opioid use: a population-based cohort study
AID  - 10.1503/cmaj.221351
DP  - 2023 Jul 31
TA  - Canadian Medical Association Journal
PG  - E973--E983
VI  - 195
IP  - 29
4099  - http://www.cmaj.ca/content/195/29/E973.short
4100  - http://www.cmaj.ca/content/195/29/E973.full
SO  - CMAJ2023 Jul 31; 195
AB  - Background: Oxycodone is increasingly prescribed for postpartum analgesia in lieu of codeine owing to concerns regarding the neonatal safety of codeine during lactation. We examined whether initiation of oxycodone after delivery was associated with an increased risk of persistent opioid use relative to initiation of codeine.Methods: We conducted a population-based cohort study of people who filled a prescription for either codeine or oxycodone within 7 days of discharge from hospital after delivery between Sept. 1, 2012, and June 30, 2020. The primary outcome was persistent opioid use, defined as 1 or more additional prescriptions for an opioid within 90 days of the first postpartum prescription and 1 or more additional prescriptions in the 91 to 365 days thereafter. We used inverse probability of treatment weighting to assess the risk of persistent postpartum opioid use, comparing people who initiated oxycodone with those who initiated codeine.Results: Over the 8-year study period, we identified 70 607 people who filled an opioid prescription within 7 days of discharge from hospital: 21 308 (30.2%) received codeine and 49 299 (69.8%) oxycodone. Compared with people who filled a prescription for codeine, receipt of oxycodone was not associated with persistent opioid use (relative risk [RR] 1.04, 95% confidence interval [CI] 0.91–1.20). We found an association between a prescription for oxycodone and persistent use after vaginal delivery (RR 1.63, 95% CI 1.31–2.03), but not after cesarean delivery (RR 0.85, 95% CI 0.73–1.00).Interpretation: Initiation of oxycodone (v. codeine) was not associated with an increased risk of persistent opioid use, except after vaginal delivery.