BMJ mental health · 2026
ADHD medication discontinuation and non-adherence: a Norwegian population-based register study.
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Garcia-Argibay Miguel, Hofstad Tore, Bjelland Ingvar, Cortese Samuele, Mykletun Arnstein
Аннотация
BACKGROUND: Poor persistence and adherence to attention-deficit/hyperactivity disorder (ADHD) medication is a significant barrier to effective long-term care, particularly during adolescence, yet age-specific and sex-specific trajectories remain poorly characterised.
OBJECTIVE: To characterise medication initiation, discontinuation and long-term adherence patterns for children and adolescents diagnosed with ADHD in a real-world setting.
METHODS: A nationwide retrospective cohort study, including 8961 children and adolescents (aged <18 years) with a new ADHD diagnosis in child and adolescent mental health services between 1 January 2010 and 31 December 2012, with follow-up until 31 December 2021. Main outcomes were medication initiation rates; time to first medication discontinuation, analysed using Kaplan-Meier estimates and restricted mean survival time at 1 year and longitudinal adherence, measured by the proportion of days covered over 9 years.
FINDINGS: Of the 8961 individuals in the cohort (mean age at diagnosis, 12 years; 69% male), 6661 (74.3%) initiated medication, with a median time from diagnosis to initiation of 106 days (IQR 17-231); 55% initiated within 90 days. Discontinuation increased significantly with age; adolescents aged 15-17 years remained on treatment for 31.9 fewer days (95% CI -40.8 to -23.1; p<0.001) in the first year compared with children aged 5-11 years. Females also discontinued significantly earlier than males (difference -13.2 days; 95% CI -19.8 to -6.5; p<0.001). Longitudinal analysis confirmed that older age at initiation and female sex were associated with a significantly steeper decline in medication coverage over time.
CONCLUSIONS: Discontinuation and low adherence to ADHD medication were common and increased substantially through adolescence, with females at higher risk of early cessation.
CLINICAL IMPLICATIONS: Late adolescence warrants closer clinical monitoring and shared decision-making to support appropriate treatment continuation or well-informed discontinuation, particularly for older adolescents and females. Integrating structured transition planning and attention to sex-specific barriers may help reduce avoidable non-adherence during this high-risk period.
OBJECTIVE: To characterise medication initiation, discontinuation and long-term adherence patterns for children and adolescents diagnosed with ADHD in a real-world setting.
METHODS: A nationwide retrospective cohort study, including 8961 children and adolescents (aged <18 years) with a new ADHD diagnosis in child and adolescent mental health services between 1 January 2010 and 31 December 2012, with follow-up until 31 December 2021. Main outcomes were medication initiation rates; time to first medication discontinuation, analysed using Kaplan-Meier estimates and restricted mean survival time at 1 year and longitudinal adherence, measured by the proportion of days covered over 9 years.
FINDINGS: Of the 8961 individuals in the cohort (mean age at diagnosis, 12 years; 69% male), 6661 (74.3%) initiated medication, with a median time from diagnosis to initiation of 106 days (IQR 17-231); 55% initiated within 90 days. Discontinuation increased significantly with age; adolescents aged 15-17 years remained on treatment for 31.9 fewer days (95% CI -40.8 to -23.1; p<0.001) in the first year compared with children aged 5-11 years. Females also discontinued significantly earlier than males (difference -13.2 days; 95% CI -19.8 to -6.5; p<0.001). Longitudinal analysis confirmed that older age at initiation and female sex were associated with a significantly steeper decline in medication coverage over time.
CONCLUSIONS: Discontinuation and low adherence to ADHD medication were common and increased substantially through adolescence, with females at higher risk of early cessation.
CLINICAL IMPLICATIONS: Late adolescence warrants closer clinical monitoring and shared decision-making to support appropriate treatment continuation or well-informed discontinuation, particularly for older adolescents and females. Integrating structured transition planning and attention to sex-specific barriers may help reduce avoidable non-adherence during this high-risk period.