ADHD: Stimulant and non-stimulant drugs may improve cognitive function

Evan Walker
Evan Walker TheMediTary.Com |
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A new study found that stimulant and non-stimulant medications prescribed for ADHD improve long-term cognitive function in people with the condition. Anastasiia Sienotova/Getty Images
  • Stimulant and non-stimulant medications prescribed for ADHD improve cognitive function, according to a new study.
  • The researchers examined the long-term effects of both types of drugs, and concluded these medications offered similar — but not identical — cognitive benefits.
  • ADHD medications affect the uptake of dopamine and noradrenaline, two brain chemicals that are typically lower in people with this condition.

Common medicines for treating attention-deficit hyperactivity disorder (ADHD) promote cognitive function, according to new research.

The results show that ADHD medications improve attention, inhibition, reaction time, and working memory, four key cognitive functions.

The researchers explored two types of ADHD medications that may be prescribed long-term: methylphenidate represented ADHD stimulants and atomoxetine represented non-stimulants.

Included in the meta-study were 20 methylphenidate clinical tests lasting at least a week, and eight tests of atomoxetine lasting at least three weeks.

Overall, the study authors found that chronic use of both medications produced generally similar cognitive benefits.

ADHD is associated with cognitive impairment to varying degrees. The findings of this study offer encouragement that ADHD medications could support cognitive function in children, adolescents, and adults with ADHD.

The study is published in Neuroscience and Biobehavioral Reviews.

Both stimulant and non-stimulant ADHD medications showed improvements across all cognitive domains with the exception of atomoxetine, which did not show an effect on working memory.

Menka Gupta, MD, a functional medicine doctor at Nutra Nourish, not involved in the study, explained to Medical News Today:

“Stimulants enhance dopamine and norepinephrine levels — which are crucial for attention and executive function — by blocking their reuptake. Non-stimulants also support cognitive function, but through different pathways; either by selectively inhibiting norepinephrine reuptake or by modulating alpha-2 adrenergic receptors in the prefrontal cortex.”

David Merrill, MD, PhD, a geriatric psychiatrist and director of the Pacific Neuroscience Institute’s Pacific Brain Health Center at Providence Saint John’s Health Center in Santa Monica, CA, not involved with the new research, told MNT:

“Both types of medications improve cognitive functions like attention and working memory by optimizing neurotransmitter levels and enhancing brain network connectivity.”

ADHD is is prominently diagnosed in childhood, although adults may receive diagnoses as well.

This neurodivergent condition is characterized by hyperactivity, inattentiveness, and impulsivity. With hyperactivity, a person is continually moving and seemingly unable to stay still. With impulsivity, an individual may act without careful foresight.

The inattention component of ADHD involves being readily distracted and having a short attention span, as well as having difficulty following through on complex tasks.

Gupta explained that children with ADHD “may fidget, interrupt others frequently, and struggle to complete tasks.”

“Adults with ADHD, experience chronic disorganization, poor time management, and difficulty prioritizing tasks. They may feel restless, easily distracted, and find it challenging to maintain focus during meetings or day-to-day conversations,” Gupta said.

Merrill noted adults with ADHD may experience difficulty “with time management, organization, maintaining focus, and following through on tasks.”

Jasmin Dao, MD, PhD, a pediatric neurologist at Miller Children’s & Women’s Hospital, Long Beach, CA, also not involved in the study, told MNT that hyperactivity often develops around 4 years of age. “It peaks at 7 to 8 years old, and then when you get into adolescent years, that hyperactivity tends to go away a little bit more,” Dao said.

While impulsivity is usually prominent during childhood, it may last into adulthood. Dao said this is the most common ADHD trait seen in adults, and it may negatively impact a person’s social skills.

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