I have a friend whose son was prescribed Adderall when he was 12-13 years old. She noticed the adverse effects right away, so she discontinued the drug, and took her son out of school for a year. He did much better getting homeschooled, and was able to return to the public school system after a year.

Most of the "mental health" diagnoses have to do with metabolic problems. Emotional stress is one of the drains on the body's energy reserves.

Stimulants like amphetamine 'shred' our mitochondria. It's okay for a short-term boost, but causes deterioration too: https://www.hackerneue.com/item?id=18211048