Show that you understand and care about his feelings, that you are proud of his successes, and his willingness to try. Impulsiveness, poor judgment, and difficulty in picking up social cues lead them to misunderstand or ignore signs of trouble. They may try to blame others, or to pretend that the problem doesn't exist. They need clear, no nonsense rules that are appropriate to their developmental level. Be ready to step in before things get out of hand.
Most children learn by experience.
The child with ADHD may need your help to interpret his experiences correctly. Hyperactive children don't always recognize their bodies' signals. You may need to interrupt play that is too rough or too tiring. Supervision can prevent this. These drugs are not addictive, but they must be used carefully, under a doctor's supervision.