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Original Investigation
August 2018

Comparison of Safety and Efficacy of Methadone vs Morphine for Treatment of Neonatal Abstinence Syndrome: A Randomized Clinical Trial

Author Affiliations
  • 1Department of Pediatrics, The Floating Hospital for Children at Tufts Medical Center, Boston, Massachusetts
  • 2Tufts Clinical and Translational Science Institute, Tufts University, Boston, Massachusetts
  • 3The Institute for Clinical Research and Health Policy Studies, Tufts Medical Center, Boston, Massachusetts
  • 4Department of Pediatrics, Baystate Medical Center, Springfield, Massachusetts
  • 5Department of Pediatrics, Jacksonville–University of Florida Health, Jacksonville
  • 6Department of Pediatrics, Boston Medical Center, Boston, Massachusetts
  • 7Department of Pediatrics, Maine Medical Center, Portland
  • 8Department of Pediatrics, Women and Infant’s Hospital, Providence, Rhode Island
  • 9Department of Pediatrics, Monroe Carell Jr Children's Hospital at Vanderbilt, Nashville, Tennessee
  • 10Vanderbilt University School of Nursing, Nashville, Tennessee
  • 11Department of Pediatrics, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania
JAMA Pediatr. 2018;172(8):741-748. doi:10.1001/jamapediatrics.2018.1307
Key Points

Question  Does methadone or morphine have better safety and efficacy for the treatment of neonatal abstinence syndrome?

Findings  In this randomized clinical trial, 117 infants were randomized to treatment with methadone or morphine using a weight- and sign-based treatment protocol. Methadone was associated with reductions in length of hospital stay, length of hospital stay attributable to neonatal abstinence syndrome, and length of treatment after adjusting for study site and type of maternal opioid.

Meaning  Methadone is more effective than morphine only in infants needing pharmacologic treatment for neonatal abstinence syndrome.

Abstract

Importance  Although opioids are used to treat neonatal abstinence syndrome (NAS), the best pharmacologic treatment has not been established.

Objective  To compare the safety and efficacy of methadone and morphine in NAS.

Design, Setting, and Participants  In this randomized, double-blind, intention-to-treat trial, term infants from 8 US newborn units whose mothers received buprenorphine, methadone, or opioids for pain control during pregnancy were eligible. A total of 117 infants were randomized to receive methadone or morphine from February 9, 2014, to March 6, 2017. Mothers who declined randomization could consent to data collection and standard institutional treatment.

Interventions  Infants were assessed with the Finnegan Neonatal Abstinence Scoring System every 4 hours and treated with methadone or placebo every 4 hours or morphine every 4 hours. Infants with persistently elevated Finnegan scores received dose increases. Infants who exceeded a predetermined opioid dose received phenobarbital. Dose reductions occurred every 12 to 48 hours when signs of NAS were controlled with therapy, stopping at 20% of the original dose.

Main Outcomes and Measures  The primary end point was length of hospital stay (LOS). The secondary end points were LOS attributable to NAS and length of drug treatment (LOT).

Results  A total of 183 mothers consented to have their infants in the study; 117 infants required treatment. Because 1 parent withdrew consent, data were analyzed on 116 infants (mean [SD] gestational age, 39.1 [1.1] weeks; mean [SD] birth weight, 3157 [486] g; 58 [50%] male). Demographic variables and risk factors were similar except for more prenatal cigarette exposure in infants who received methadone. Adjusting for study site and maternal opioid type, methadone was associated with decreased mean number of days for LOS by 14% (relative number of days, 0.86; 95% CI, 0.74-1.00; P = .046), corresponding to a difference of 2.9 days; 14% reduction in LOS attributable to NAS (relative number of days, 0.86; 95% CI, 0.77-0.96; P = .01), corresponding to a difference of 2.7 days; and 16% reduction in LOT (relative number of days, 0.84; 95% CI, 0.73-0.97; P = .02), corresponding to a difference of 2.3 days. Methadone was also associated with reduced median LOS (16 vs 20 days, P = .005), LOS attributable to NAS (16 vs 19 days, P = .005), and LOT (11.5 vs 15 days, P = .009). Study infants had better short-term outcomes than 170 nonrandomized infants treated with morphine per standard institutional protocols.

Conclusions and Relevance  With use of weight- and sign-based treatment for NAS, short-term outcomes were better in infants receiving methadone compared with morphine. Assessment of longer-term outcomes is ongoing.

Trial Registration  ClinicalTrials.gov Identifier: NCT01958476

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