Personality traits predict which ADHD patients fail to improve on medication
A study of 246 adults found that personality pathology undermines ADHD drug treatment effectiveness, even when medications reduce symptoms. The finding matters for employers and insurers: medication alone won't solve workplace functioning problems for a substantial portion of ADHD patients, signaling a need for supplementary interventions and realistic outcome expectations.
Originaltitel: Personality Pathology and Functional Outcomes During Pharmacological Treatment of Adult ADHD
Adults with ADHD show substantial variability in response to pharmacological treatment, and comorbid personality pathology may help explain why symptom improvement often fails to translate into meaningful functional improvement. This naturalistic longitudinal study examined whether dimensional personality pathology predicts symptomatic and functional outcomes during routine stimulant treatment. A total of 246 adults with ADHD (66% women; mean age = 33.5) contributed repeated assessments over irregular follow-up intervals, with substantial attrition across waves. Linear mixed-effects models were used to accommodate unbalanced repeated measures. Linear mixed-effects models indicated that higher personality dysfunction was strongly associated with less improvement in functioning (β = 0.44, p < 0.001) and more persistent ADHD symptoms (β = 0.20, p < 0.001), independent of stimulant dose and time in treatment. Negative affectivity, detachment, psychoticism, and disinhibition were the maladaptive trait domains most consistently linked to poorer functional outcomes, whereas disinhibition showed the strongest association with residual ADHD symptom burden. Medication-related effects were modest in comparison. These findings identify personality pathology as a clinically relevant source of heterogeneity in adult ADHD treatment response and support routine assessment of personality functioning to inform clinical decision-making.