April 22, 2026
Pediatric ADHD treatment with the stimulant medication methylphenidate may reduce future risk of adverse outcomes and provide a protective effect against adult psychiatric disorders, according to two new studies that should quell unfounded fears that stimulants may trigger psychosis and exacerbate post-traumatic stress disorder (PTSD) symptoms.1, 2
Patients with ADHD who are treated with stimulant medications experience fewer hospitalizations, emergency department visits, motor vehicle accidents, and subsequent prescriptions of antipsychotics and mood stabilizers than do similar patients treated with non-stimulants and antidepressants, a recent study published in the Journal of Attention Disorders found.3 The study also found that youth treated with stimulants had a significantly lower risk of an eventual PTSD diagnosis compared to youth treated with non-stimulants, though no causality was established.
Despite the evidence of positive outcomes, the researchers identified a shift away from prescribing methylphenidate to children with ADHD following a PTSD diagnosis. One possible explanation: Older studies have suggested a potential link between stimulant use and the onset or exacerbation of PTSD symptoms in adults with ADHD.4, 5
“These shifts may reflect clinician concerns that stimulants could exacerbate trauma-related symptoms, such as hyperarousal,” the researchers wrote, “although the evidence on this risk remains limited and mixed.”
The Journal of Attention Disorders study analyzed electronic health record data from the TriNetX Research Network of more than 714,000 children (aged 6 to 18 years) who were diagnosed with either ADHD or ADHD and PTSD between the years of 2010 and 2024.
Results from the study showed that stimulants were prescribed less often to adolescents (aged 12 to 18 years) in the ADHD-PTSD cohort compared to adolescents in the ADHD cohort, and stimulants were prescribed more frequently to males in both cohorts. Female adolescents in the ADHD-PTSD cohort were the least likely to receive stimulants. Overall, new prescriptions for methylphenidate decreased by 7% for children with ADHD following a PTSD diagnosis.
Non-Stimulants Used to Treat ADHD and PTSD
Youth with co-occurring ADHD and PTSD were more likely to be prescribed non-stimulant medications, including alpha-2 agonists and atomoxetine (a selective norepinephrine reuptake inhibitor), antidepressants, antipsychotics, mood stabilizers, and psychotherapy compared to children with ADHD alone. Guanfacine (brand name: Intuniv) was the most prescribed non-stimulant in both cohorts, though it was prescribed slightly more in the ADHD cohort (55%) compared to the ADHD-PTSD cohort (49%).
Clonidine (brand name: Catapres) prescriptions were significantly higher among youth in the ADHD-PTSD cohort (39%) than they were in the ADHD group (20%). Clonidine, a blood pressure medication, is also used to treat sleep disturbances in children.
“Its elevated use in youth with PTSD, even after adjusting for diagnosed sleep disorders, suggests clinicians select it for other reasons, possibly such as reducing hyperarousal, which is a core symptom of PTSD though such off-label prescribing warrants careful clinical oversight,” the researchers wrote about clonidine.
Atomoxetine (brand name: Strattera) made up about 20% of the non-stimulant prescriptions.
Antidepressants, Antipsychotics, & Other Treatments for ADHD and PTSD
Among non-ADHD medications in the study, antidepressants were prescribed the most often across both cohorts, with a 29% relative increase in the PTSD-ADHD cohort.
Antipsychotics and mood stabilizers are typically reserved for treatment-resistant or clinically complex cases, the researchers noted. However, “These medications were frequently initiated early in the treatment course despite a lack of evidence to support their selection as initial treatment options,” they wrote.
Stimulants and Psychotherapy
Not all patients use their prescribed medications. The longitudinal analysis of sequential treatment stages within the ADHD-PTSD cohort showed that stimulant medications and psychotherapy were the most frequently used, with psychotherapy use gradually increasing over time.
“While rates of antipsychotic and mood stabilizer prescriptions increased following a PTSD diagnosis, it is encouraging that stimulants and psychotherapy remained the most commonly used treatments,” the researchers wrote. Behavioral therapy along with use of ADHD stimulants, such as methylphenidate and amphetamine, are considered first-line treatments for ADHD in children ages six and older.
Protective Effect of Methylphenidate
The potential protective effect of methylphenidate was the focus of one of the most comprehensive investigations to date on the long-term mental health outcomes associated with ADHD treatment.
The cohort study published in JAMA Psychiatry found that children with ADHD who were treated with methylphenidate before age 13, and who sustained treatment for at least 3 to 4 years, experienced significantly lower risk of psychosis and psychotic disorders, such as schizophrenia, in adulthood, compared to their unmedicated ADHD peers. In addition, children with ADHD who used methylphenidate were no more likely to be diagnosed with psychosis than were unmedicated patients with ADHD.6
“The observation that treating ADHD with methylphenidate specifically in childhood was associated with a reduced risk of nonaffective psychosis may point toward a sensitive developmental window in which methylphenidate could affect the trajectory of brain development,” the researchers wrote.
The researchers used advanced statistical modeling to analyze health data from 678,546 people born in Finland, from 1987 to 1997, who were diagnosed with ADHD before age 18 and after January 1, 2003.
How Stimulants Impact Developing Brains
Findings from the JAMA Psychiatry study build on the results from a 2025 longitudinal magnetic resonance imaging (MRI) study published in Progress in Neuro-Psychopharmacology & Biological Psychiatry, which showed that early and consistent use of methylphenidate influences frontal lobe development in the brains of children with ADHD.7
The study divided the participants into three groups: early-exposure (methylphenidate exposure before age 12), late-exposure (methylphenidate exposure after age 12), and control. When the researchers compared baseline MRI scans with scans taken five years later, they found brain growth in the early-exposure group but no change in brain volume in the late-exposure group.
“The findings suggest that initiating methylphenidate treatment earlier, particularly before the age of 12, may be more effective in driving structural brain changes and potentially normalizing the atypical brain development associated with ADHD,” the authors wrote.
During the ADDitude webinar “ADHD Medication Options and Benefits for Children,”
Walt Karniski, M.D., explained that three regions of the ADHD brain differ from neurotypical brains.
“If a child is not treated with ADHD medication, these brain differences persist into adulthood,” he said. “Adults with ADHD who were treated with stimulant medication as children no longer exhibit these brain differences.”
In other words, early and long-term ADHD medication use changes the brain, resulting in positive outcomes.
“There is now data out there… that treatment isn’t just about the symptoms now; it’s about preventing damage in the brain so you don’t develop secondary issues like anxiety, depression, emotional dysregulation, and insomnia,” said Greg Mattingly, M.D., during his April 2026 ADDitude webinar titled, “The Brain Chemistry of ADHD.”
While the JAMA Psychiatry study provides new insights for psychosis prediction and prevention in children with ADHD, it did not rule out the possibility of an increased risk of psychotic disorders in individuals diagnosed with ADHD in adolescence or older. More studies are needed to evaluate the effects of treatment in those populations.
Sources
1Mosholder, A.D., Gelperin, K., Hammad, T.A., Phelan, K., Johann-Liang, R. (2009). Hallucinations and other psychotic symptoms associated with the use of attention-deficit/hyperactivity disorder drugs in children. Pediatrics. https://doi.org/10.1542/peds.2008-0185
2Moran, L.V., Ongur, D., Hsu, J., Castro, V.M., Perlis, R.H., Schneeweiss, S. (2019). Psychosis with methylphenidate or amphetamine in patients with ADHD. N Engl J Med. https://doi.org/10.1056/NEJMoa1813751
3Baweja, R., Lopes, F., Padilla, F.M., Baweja, R., Amaya-Jackson, L., Waschbusch, D.A., & Waxmonsky, J.G. (2026). Treatment patterns and clinical outcomes in youth with comorbid ADHD and PTSD: insights from real-world data. Journal of Attention Disorders. https://doi.org/ 10.1177/10870547261416173
4Crum-Cianflone, N.F., Frasco, M.A., Armenta, R.F., Phillips, C.J., Horton, J., Ryan, M.A., Russell, D.W., Leard Mann, C. (2015). Prescription stimulants and PTSD among US military service members. Journal of Traumatic Stress. https://doi.org/10.1002/jts.22052
5Houlihan D.J. (2011). Psychostimulant treatment of combat-related posttraumatic stress disorder. Journal of Psychopharmacology. https://doi.org/10.1177/0269881110385600
6Healy, C., O’Hare, K., Lång, U., et al. (2026). Methylphenidate treatment and risk of psychotic disorder. JAMA Psychiatry. https://doi.org/10.1001/jamapsychiatry.2026.0152
7Chang, J., Lin, H., & Gau, S.S.F. (2025). Age-dependent effects of cumulative methylphenidate exposure on brain structure and symptom amelioration in youth with ADHD: A longitudinal MRI study. Progress in Neuro-Psychopharmacology and Biological Psychiatry. https://doi.org/10.1016/j.pnpbp.2025.111429