Unfortunately, that study was done a couple of hundred years after the UK lost control of North Carolina, so it doesn’t support the claim that ADHD medication is overprescribed in the UK.

This is a little misleading. Like most macro trends, the actual situation is far more complicated. Here’s a study describing under diagnosis of ADHD in adults

While it’s likely true that the condition is overdiagnosed in adolescent populations, it’s also widely acknowledged that ADHD is less commonly diagnosed once in adulthood.

North Carolina is neither in the UK or Europe