Abstract
Background
Increasing numbers of reproductive-aged women are using attention-deficit/hyperactivity disorder (ADHD) medications. Findings from studies exploring the safety of these medications during pregnancy are mixed, and it is unclear whether associations reflect causal effects or could be partially or fully explained by other factors that differ between exposed and unexposed offspring.
Objectives
The aim of this systematic review was to evaluate the adverse pregnancy-related and offspring outcomes associated with exposure to prescribed ADHD medication during pregnancy with a focus on how studies to date have handled the influence of confounding.
Methods
We searched PubMed, Embase, PsycINFO, and Web of Science up to 1 July 2019 without any restrictions on language or date of publication. We included all observational studies (e.g., cohort studies, case–control studies, case–crossover studies, cross-sectional studies, and registry-based studies) with pregnant women of any age or from any setting who were prescribed ADHD medications and evaluated any outcome, including both short- and long-term maternal and offspring outcomes. Two independent authors then used the Newcastle–Ottawa Scale to rate the quality of the included studies.
Results
Eight cohort studies that estimated adverse pregnancy-related and offspring outcomes associated with exposure to ADHD medication during pregnancy were included in the qualitative review. The included studies had substantial methodological differences in data sources, type of medications examined, definitions of studied pregnancy-related and offspring outcomes, types of control groups, and confounding adjustment. There was no convincing evidence for teratogenic effects according to the relative risk of pregnancy-related and offspring outcomes, and the observed differences in absolute risks were overall small in magnitude. Adjustment for confounding was inadequate in most studies, and none of the included studies adjusted for ADHD severity in the mothers.
Conclusion
The current evidence does not suggest that the use of ADHD medication during pregnancy results in significant adverse consequences for mother or offspring. However, the data are too limited to make an unequivocal recommendation. Therefore, physicians should consider whether the advantages of using ADHD medication outweigh the potential risks for the developing fetus according to each woman’s specific circumstances. Future research should attempt to triangulate research findings based on a combination of different designs that differ in their underlying strengths and limitations and should investigate specific confounding factors, the potential impact of timing of exposure, and potential long-term outcomes in the offspring.
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Research reported in this publication was supported by the Swedish Research Council (no. 2018-02599 to Larsson and no. 2018-02679 to D’Onofrio), the Swedish Brain Foundation (Viktorin and no. FO2018-0273 to Larsson) and the National Institute on Drug Abuse of the National Institutes of Health under award number R00DA040727 (Quinn) and R01DA048042 (D’Onofrio, Quinn, Oberg). The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health.
Conflict of interest
HL has served as a speaker for Evolan Pharma and Shire and has received research grants from Shire, all outside the submitted work. SC has received honoraria and reimbursement of travel and accommodation expenses for lectures from the nonprofit associations Association for Child and Adolescent Central Health, Canadian ADHD Alliance Resource (CADDRA), and BAP and from Healthcare Convention for educational activity on ADHD. BD has received reimbursement of travel and accommodation expenses for CADDRA and Children and Adults with Attention-Deficit/Hyperactivity Disorder. LL, ACS, AB, ZC, PQ, AV, and ASÖ have no conflicts of interest that are directly relevant to the content of this article.
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Li, L., Sujan, A.C., Butwicka, A. et al. Associations of Prescribed ADHD Medication in Pregnancy with Pregnancy-Related and Offspring Outcomes: A Systematic Review. CNS Drugs 34, 731–747 (2020). https://doi.org/10.1007/s40263-020-00728-2
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DOI: https://doi.org/10.1007/s40263-020-00728-2