Long-term effect of ADHD medications on academic achievement

Attention-deficit/hyperactivity disorder (ADHD) is a highly prevalent childhood mental disorder. Medication is frequently prescribed to alleviate symptoms, often with the concurrent hope of improving academic performance; however, robust evidence regarding its long-term impact on complex educational outcomes remains sparse. Using a target trial emulation framework, Tomás Varnet Pérez, Guido Biele and colleagues estimated the intention-to-treat effect of ADHD medication on academic performance. The primary analysis linked national registries to evaluate grade eight national test scores of 8,548 children diagnosed with ADHD in Norway (born 2000–2007). To assess generalisability, they present cross-national replications utilising administrative data from a second country. Furthermore, they conducted a multiverse analysis to systematically investigate methodological discrepancies and elucidate why Keilow et al. (2018) reported substantially larger medication effects. In the Norwegian cohort, initiating ADHD medication yielded negligible average effects on standardised national test scores across three domains: English (SMD=0.037, 95% CI: -0.003 –0.076), numeracy (SMD=0.063, CI: 0.016–0.111), and reading (SMD=0.071, CI: 0.030–0.111). The replication and multiverse analyses show that the results hold for standardised tests and teacher-rated performance and that distinguishing effects of treatment initiation and discontinuation is crucial. The estimated long-term average effect of ADHD medication on standardised academic learning is not clinically relevant. These findings are based on real-world, ecologically valid data, cross-national replication, and robust modelling. The limited effect on learning outcomes does not invalidate the utility of ADHD medication to manage core ADHD symptoms; but it shows that medication is not an easy fix for functional problems at school.