Fifteen years' experience with methylphenidate for attention-deficit disorder during pregnancy: Effects on birth weight, Apgar score and congenital malformation rates

Methylphenidate and Atomoxetine in Pregnancy and Possible Adverse Fetal Outcomes: A Systematic Review and Meta-Analysis

Importance

Attention-deficit/hyperactivity disorder (ADHD) is one of the most common neurobehavioral disorders, and it afflicts about 7% of young people. As a consequence, many young women might be pregnant while taking medication for ADHD, but data about safety have not yet been strictly examined.

Objective

To examine adverse effects in offspring of mothers receiving treatment with atomoxetine and methylphenidate during pregnancy.

Data Sources

Electronic databases (PubMed, Embase, and PsycINFO) were searched for articles published through December 31, 2023, with the following search terms: (atomoxetine OR methylphenidate) AND (pregnancy).

Study Selection

Observational studies (eg, cohort studies, case-control studies, case-crossover studies, cross-sectional studies, and registry-based studies) that reported offspring outcomes in pregnancy with atomoxetine and/or methylphenidate and in mothers with ADHD but unexposed to ADHD treatment during pregnancy or from the general population were included. Ten studies of 656 records satisfied criteria.

Data Extraction and Synthesis

Two independent reviewers performed data extraction according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines. Meta-analyses were conducted based on reported odds ratios (ORs) and corresponding 95% CIs using a linear random effects model. Each study was inversely weighted by the reported variance of the estimators. Risk of publication bias and analysis of heterogeneity through univariate and multivariate metaregressions were also rated. Data were analyzed from January to March 2024.

Main Outcomes and Measures

Study outcomes included miscarriages and congenital anomalies.

Results

Ten studies involving 16 621 481 pregnant women, 30 830 of them affected by ADHD, were included. Congenital anomalies or miscarriages were not more frequent in offspring of mothers receiving treatment with methylphenidate or atomoxetine during pregnancy compared with unexposed offspring (OR, 1.14; 95% CI, 0.83-1.55; P = .41; I2 = 8% for congenital anomalies; OR, 1.01; 95% CI, 0.70-1.47; P = .96; I2 = 0% for miscarriages) or compared with the general population (OR, 1.19; 95% CI, 0.93-1.53; P = .16; I2 = 74% for congenital anomalies; OR, 1.05, 95% CI, 0.81-1.37; P = .70; I2 = 0% for miscarriage).

Conclusions and Relevance

Evidence from this meta-analysis, which involves a substantial sample of pregnant women with and without ADHD, suggests the maintenance of methylphenidate or atomoxetine during pregnancy is safe, given that congenital anomalies and miscarriages did not appear to significantly increase. Further studies are recommended to support and confirm these findings.

Investigating maternal and neonatal health outcomes associated with continuing or ceasing dexamphetamine treatment for women with attention-deficit hyperactivity disorder during pregnancy: a retrospective cohort study

PURPOSE

Attention-deficit hyperactivity disorder (ADHD) is becoming more commonly diagnosed in women, consequently, more women of reproductive age are taking ADHD medication, such as dexamphetamine. However, the safety associated with continuing or ceasing dexamphetamine during pregnancy is unclear. This study investigates outcomes associated with the continuation of dexamphetamine during pregnancy compared to those who ceased or were unexposed.

METHODS

A population-based retrospective cohort of women from Western Australia who had been dispensed dexamphetamine during pregnancy and gave birth between 2003 and 2018. Women had either continued to take dexamphetamine throughout pregnancy (continuers, n = 547) or ceased dexamphetamine before the end of the second trimester (ceasers, n = 297). Additionally, a matched (1:1) comparison group of women who were dispensed an ADHD medication prior to pregnancy but not during pregnancy (unexposed) was included in the study (n = 844). Multivariable generalised linear models were used to compare maternal and neonatal health outcomes.

RESULTS

Compared to continuers, ceasers had greater odds of threatened abortion (OR: 2.28; 95%CI: 1.00, 5.15; p = 0.049). The unexposed had some benefits compared to the continuers, which included lower risk of preeclampsia (OR: 0.58; 95%CI: 0.35, 0.97; p = 0.037), hypertension (OR: 0.32; 95%CI: 0.11, 0.93; p = 0.036), postpartum haemorrhage (OR: 0.57; 95%CI: 0.41, 0.80; p = 0.001), neonatal special care unit admittance (OR: 0.16; 95%CI: 0.12, 0.20; p < 0.001) and fetal distress (OR: 0.73; 95%CI: 0.54, 0.99; p = 0.042).

CONCLUSION

Continuing dexamphetamine throughout pregnancy was not associated with an increase in adverse neonatal and maternal health outcomes compared to ceasing. Ceasing dexamphetamine during pregnancy was associated with increased odds of threatened abortion compared with continuing dexamphetamine. However, this is something that requires further investigation due to the small sample size, difficulties examining timing, and the inability to examine spontaneous abortions. The unexposed showed some benefits compared to the continuers, suggesting that where possible the cessation of dexamphetamine prior to pregnancy may be advisable.

Attention-deficit/hyperactivity disorder in pregnancy and the postpartum period

Attention-deficit/hyperactivity disorder is a childhood-onset neurodevelopmental disorder that frequently persists into adulthood with 3% of adult women having a diagnosis of attention-deficit/hyperactivity disorder. Many women are diagnosed and treated during their reproductive years, which leads to management implications during pregnancy and the postpartum period. We know from clinical practice that attention-deficit/hyperactivity disorder symptoms frequently become challenging to manage during the perinatal period and require additional support and attention. There is often uncertainty among healthcare providers about the management of attention-deficit/hyperactivity disorder in the perinatal period, particularly the safety of pharmacotherapy for the developing fetus. This guideline is focused on best practices in managing attention-deficit/hyperactivity disorder in the perinatal period. We recommend (1) mitigating the risks associated with attention-deficit/hyperactivity disorder that worsen during the perinatal period via individualized treatment planning; (2) providing psychoeducation, self-management strategies or coaching, and psychotherapies; and, for those with moderate or severe attention-deficit/hyperactivity disorder, (3) considering pharmacotherapy for attention-deficit/hyperactivity disorder, which largely has reassuring safety data. Specifically, providers should work collaboratively with patients and their support networks to balance the risks of perinatal attention-deficit/hyperactivity disorder medication with the risks of inadequately treated attention-deficit/hyperactivity disorder during pregnancy. The risks and impacts of attention-deficit/hyperactivity disorder in pregnancy can be successfully managed through preconception counselling and appropriate perinatal planning, management, and support.

In utero exposure to ADHD medication and long-term offspring outcomes

Attention Deficit Hyperactivity Disorder (ADHD) medication is increasingly being used during pregnancy. Concerns have been raised as to whether ADHD medication has long-term adverse effects on the offspring. The authors investigated whether in utero exposure to ADHD medication was associated with adverse long-term neurodevelopmental and growth outcomes in offspring. The population-based cohort study in the Danish national registers included 1,068,073 liveborn singletons from 1998 to 2015 followed until any developmental diagnosis, death, emigration, or December 31, 2018. Children of mothers who continued ADHD medication (methylphenidate, amphetamine, dexamphetamine, lisdexamphetamine, modafinil, atomoxetine, clonidine) during pregnancy and children of mothers who discontinued ADHD medication before pregnancy were compared using Cox regression. Main outcomes were neurodevelopmental psychiatric disorders, impairments in vision or hearing, epilepsy, seizures, or growth impairment during childhood or adolescence. In total, 898 children were exposed to ADHD medication during pregnancy compared to 1270 children whose mothers discontinued ADHD medication before pregnancy. After adjustment for demographic and psychiatric characteristics of the mother, no increased risk of any offspring developmental disorders was found combined (aHR 0.97, 95% CI 0.81 to 1.17) or for separate subcategories. Similarly, no increased risk was found for any sub-categories of outcomes in the negative control or sibling controlled analyses. Neurodevelopment and growth in offspring do not differ based on antenatal exposure to ADHD medication. These findings provide reassurance for women with ADHD who depend on ADHD medication for daily functioning and who consider continuing medication in pregnancy.

The association between psychostimulant use in pregnancy and adverse maternal and neonatal outcomes: results from a distributed analysis in two similar jurisdictions

BACKGROUND

Conflicting evidence suggests a possible association between use of prescribed psychostimulants during pregnancy and adverse perinatal outcomes.

METHODS

We conducted population-based cohort studies including pregnancies conceived between April 2002 and March 2017 (Ontario, Canada; N = 554 272) and January 2003 to April 2011 [New South Wales (NSW), Australia; N = 139 229]. We evaluated the association between exposure to prescription amphetamine, methylphenidate, dextroamphetamine or lisdexamfetamine during pregnancy and pre-eclampsia, placental abruption, preterm birth, low birthweight, small for gestational age and neonatal intensive care unit admission. We used inverse probability of treatment weighting based on propensity scores to balance measured confounders between exposed and unexposed pregnancies. Additionally, we restricted the Ontario cohort to social security beneficiaries where supplementary confounder information was available.

RESULTS

In Ontario and NSW respectively, 1360 (0.25%) and 146 (0.10%) pregnancies were exposed to psychostimulants. Crude analyses indicated associations between exposure and nearly all outcomes [OR range 1.15-2.16 (Ontario); 0.97-2.20 (NSW)]. Nearly all associations were attenuated after weighting. Pre-eclampsia was the exception: odds remained elevated in the weighted analysis of the Ontario cohort (OR 2.02, 95% CI 1.42-2.88), although some attenuation occurred in NSW (weighted OR 1.50, 95% CI 0.77-2.94) and upon restriction to social security beneficiaries (weighted OR 1.24, 95% CI 0.64-2.40), and confidence intervals were wide.

CONCLUSIONS

We observed higher rates of outcomes among exposed pregnancies, but the attenuation of associations after adjustment and likelihood of residual confounding suggests psychostimulant exposure is not a major causal factor for most measured outcomes. Our findings for pre-eclampsia were inconclusive; exposed pregnancies may benefit from closer monitoring.