TORONTO - Researchers say there's been a dramatic rise in the number of people going on medications to treat attention deficit/hyperactivity disorder in Ontario, suggesting factors such as more time spent online and the rise of private assessments for the mental condition could be behind the increase.

A study published Thursday in JAMA Network Open looked at all prescriptions for stimulant drugs such as Ritalin and Adderall dispensed in the province between 2015 and 2023.

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