Impact of In-utero Exposure to Selective Serotonin Reuptake Inhibitors and Opioids on Neonatal Opioid Withdrawal Syndrome.

Objective: The objective of this study was to compare short-term outcomes of neonatal opioid withdrawal syndrome (NOWS) treatment in infants exposed in-utero to opioids and selective serotonin reuptake inhibitors (SSRIs) or opioids alone.

Methods: This was a retrospective cohort study of mother-infant dyads, 34 weeks or greater gestation, receiving opioids and/or SSRIs during pregnancy. Intravenous or oral methadone was administered according to a pre-existing protocol for NOWS treatment guided by withdrawal scores. Primary outcome was length of treatment (LOT). Secondary outcomes included length of stay (LOS), total methadone exposure, time to symptom control, need for a second agent, and NOWS medications at discharge.

Results: Fifty-five mother-infant dyads were included in the study. LOT was longer in the infants in the SSRI plus opioid group but not significantly different [24 ± 23 days (SSRI plus opioid) vs 20 ± 14 days (opioid alone); P = 0.78]. There was a trend towards shorter LOS (30 ± 22 day vs 27 ± 15 days; P = 0.86), lower total methadone exposure (3.2 ± 4.3 mg/kg vs 2.7 ± 5.1 mg/kg; P = 0.66), less time to control symptoms (1 ± 1.7 days vs 0.5 ± 0.36 days; P = 0.31) and less need for a second agent (OR 2.65, 95% CI 0.69-10.5) in the opioid only group, although these observations also did not reach statistical significance.

Conclusions: This study could not demonstrate a statistically significant difference in short-term NOWS outcome of LOT between the 2 groups. However, there was a trend towards longer LOT and LOS in the SSRI plus opioid group which could be clinically significant. A larger cohort may detect a true significant difference in these short-term outcomes.