The primary outcome was the proportion of weekly urine samples negative for illicit opioids during pregnancy. The study not only met the margin for noninferiority but also demonstrated statistical superiority for the injectable formulation.
Abstinence rates from illicit opioids during pregnancy were 82.5% in the extended-release group compared to 72.6% in the sublingual group (mean difference, 9.84 percentage points; 95% CI, 1.72 to 17.95; P = 0.009). During the 12-month postpartum period, abstinence rates declined in both arms and were similar, at 60.2% and 59.5%, respectively (mean difference, 0.65 percentage points; 98% CI, −12.72 to 14.02; P = 0.45).
"Pregnant and postpartum individuals with opioid use disorder face enormous challenges," said John Winhusen, PhD, principal investigator, lead author, and professor at the University of Cincinnati College of Medicine, in a news release. "The trial results support the use of weekly extended-release buprenorphine for treating pregnant individuals with opioid use disorder."²
Maternal and neonatal safety profiles
Maternal safety findings indicated that those receiving the weekly injection experienced fewer serious adverse events.1,2 During pregnancy, serious adverse event rates were 8.7% for the extended-release group versus 26.8% for the sublingual group (P = 0.007). In the postpartum period, these rates were 6.0% and 18.6%, respectively (P = 0.04). While the overall rate of nonserious adverse events did not differ, medication-related nonserious events were more frequent in the extended-release group during pregnancy (26.1% vs 7.0%; P = 0.003).
Infant outcomes showed no significant differences regarding neonatal opioid withdrawal syndrome (NOWS). Opioid treatment for NOWS was required by 30.2% of infants exposed to extended-release buprenorphine compared to 26.5% of those exposed to the sublingual version (relative risk, 1.14; 98% CI, 0.54 to 1.99; P = 0.64).¹ The mean (SE) number of treatment days for NOWS was 10.9 (2.2) days in the extended-release group and 14.8 (3.0) days in the sublingual group (relative risk, 0.73; 98% CI, 0.36 to 1.51; P = 0.28). At birth, neonates in the extended-release group had a larger mean (SE) head circumference (34.0 [0.2] vs 33.4 [0.2] cm; mean difference, 0.63 cm; P = 0.049).
References:
- Extended-release vs sublingual buprenorphine in pregnancy through 12 months post partum. JAMA Intern Med. Published March 16, 2026. Accessed March 17, 2026. https://jamanetwork.com/journals/jamainternalmedicine/fullarticle/2846277
- NIH-funded randomized clinical trial evaluating weekly BRIXADI for opioid use disorder in pregnancy and 12-months postpartum published in JAMA Internal Medicine. Braeburn. Press release. Published March 17, 2026. Accessed March 17, 2026. https://prnmedia.prnewswire.com/news-releases/nih-funded-randomized-clinical-trial-evaluating-weekly-brixadi-for-opioid-use-disorder-in-pregnancy-and-12-months-postpartum-published-in-jama-internal-medicine
- Medication treatment for opioid use disorder in expectant mothers (MOMs). ClinicalTrials.gov. Updated June 27, 2025. Accessed March 17, 2026. https://clinicaltrials.gov/study/NCT03918850