ADHD is a condition. It exists. It is NOT corrected by whipping, beating, degrading, denying food, or any other “punishment.”
You can choose to pretend that it is a phase and allow your child to be shunned, belittled, held back and generally taught that he or she is some kind of pariah. Or you can try to treat it and give him a chance to learn and to interact with other kids.
Everything OTHER than that is BS.
Drugging a child with a controlled substance that is known to cause aberrant behavior in others not ordinarily so inclined is a very serious intervention to simply force an active student to sit still in class.