The agency says it completed safety reviews, and noted reports of suicidality associated with these drugs. Suicidality refers to suicidal thoughts, suicidal actions (attempts), and actual suicides.
Health Canada is very careful to acknowledge that there’s no scientific evidence that these drugs are actually causing this behaviour. However, the basic message is that they have some reports, and they want patients and practitioners to be aware. As Health Canada waits for the scientific data to emerge, they want doctors and families to at least be vigilant of the potential suicidal risk and suicidal behaviour.
http://globalnews.ca/news/1914689/adhd-medication-and-health-canadas-warning-of-suicidality/