The Digester

A four-year follow-up study in males with ADHD found no evidence that long-term stimulant treatment causes permanent changes in brain blood-flow responses during development, though baseline differences and study limitations mean results are not definitive.

Four-year follow-up of 56 males (32 adolescents, 24 adults) found no lasting, age-specific brain changes after long-term methylphenidate use.
Researchers measured brain blood flow before and after a methylphenidate dose using pharmacological MRI to assess functional response.
Short-term brain response differences seen in children during the original 16-week trial were not present after four years.
Some age-related links between cumulative medication exposure and brain measures were observed but were already present at baseline, suggesting pre-existing differences.
Limitations include a modest male-only sample, participant dropout, and uncontrolled medication use during the follow-up period.

Long-term ADHD stimulant use not linked to lasting brain changes in youth, study finds

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