I remember my brother was on this a short while as a teen in the 80’s. Horrible drug. His mood changed and he became quite mean, often spending most of this day locked in his room. After a while my parents chucked it out and the change was remarkable. He was a different person and it was like his personality came back for lack of a better description.
My Brother was the exact same way.
He blew his head off in August of 2006.