C.L.
I know I may be blunt, and you may not want to hear this, so if sensitive, STOP READING NOW.
When we were growing up we didn't need perscrip drugs and neither does your child. Those perscript always have side affects and that is what you're experiencing.
Use discipline. The school used it. He is suspended.
Try grounding or removing privileges. If all else fails, get out the belt. That's what the parents did back int he day, and the kids shaped up P-R-E-T-T-Y QUICK!
Spare the rod, SPOIL the child.
Get him off the drugs. It's affecting him.