No, Stimulants Don’t Cause Brain Damage

Do stimulant medications cause brain damage? It’s a frequent concern among people who avoid stimulant treatment for ADHD, both adults and parents of children with the condition.

Science shows that prescription stimulants do not cause brain damage. In fact, research suggests that stimulants have a protective effect on the ADHD brain.

What We Know About Stimulants and the Brain

Perhaps people who fear stimulants assume the medication’s potency exerts too strong a force on the brain after prolonged use. But dozens upon dozens of brain imaging studies show no anatomical, connectivity, or activation damage after stimulant treatment in the short and long term.

A robust review, for example, found that the brains of individuals with ADHD who were treated with stimulants looked more like the brains of people without ADHD than those of unmedicated people with ADHD.¹ The review, the authors wrote, “finds no evidence that stimulant treatment negatively impacts brain development or function. In contrast, these studies suggest that stimulant treatment attenuates the brain abnormalities that have been associated with ADHD.”

This data suggest that people who do not receive treatment may be consigned to more severe and debilitating ADHD as a result.

Stimulants and Brain Damage: What We Know

Is there any evidence that stimulants exert a detrimental effect on the brain? Yes – on rodents who were given stimulants at ultra-high doses beyond therapeutic ranges for humans.²

These rodents also received the drugs via injection and other routes of administration that are not comparable to oral delivery. These routes flood the capacity of the synaptic region to take in extra neurotransmitters, which causes all sorts of damage. But when rodents received doses under conditions that more closely mimicked human use, researchers did not find any signs of brain damage.³

Chronic use of illicit street stimulants like meth and cocaine do have detrimental effects on human brains — but these are substantially different than prescription ADHD medications. While these substances have chemical similarities to prescription stimulants, they differ structurally and in how they act on neurotransmitter receptors. Meth and cocaine use, especially binge use, lead to larger, faster surpluses of dopamine, norepinephrine, and serotonin in the brain compared to therapeutic use of prescribed stimulants.

These studies underscore the importance of considering the chemicals involved, dosages, route, speed of administration, and pattern of use when determining the effects of stimulants on individuals.

The bottom line is that prescription stimulant medications – when used as instructed and even over years – don’t damage the brain. Rather, evidence suggests that they protect the ADHD brain. Not taking ADHD medication, especially early on, may increase the likelihood of ongoing and persistent problems from ADHD.

This article was derived from the ADDitude ADHD Experts Webinar, An Adult’s Guide to ADHD Treatment Considerations, with John Kruse, M.D., Ph.D., and from his article “Do Stimulants Cause Brain Damage?”

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