Our son's self-esteem is low and he feels he's always wrong. He has some privilege taken away from him every week. We're at our wits' end on how to help our child and have him continue to like school.
If your son's medication is in fact appropriate and he's more "available" to learn because of it, now he needs to be taught (or retaught) coping skills to "make it" in his classroom. A big part of those skills involve self-monitoring his own behavior in and out of the classroom. It would be helpful at this point to have someone (e.g., a guidance counselor or psychologist) visit the classroom and record observations of what misbehaviors are occurring, when they occur, and what responses are generated when they occur.
This information needs to be shared with your son and his teacher as the preliminary step in generating a behavior plan where troublesome behaviors are targeted for reduction and ultimately for elimination. In his book, Problem Solver Guide for Students with ADHD, Dr. Harvey C. Parker presents several behavior-modification plans that have had good results for students in school. Whichever plan parents and the teacher choose, it's critical that they use it on a consistent basis and carefully monitor the child's progress to see if adjustments need to be made.
If no one at the school is willing or able to help you with this, then you might want to consider consulting a therapist who is experienced in working with children with ADHD. You can call the toll-free number for Children and Adults with Attention Deficit Disorders (CHADD) at 1-800-233-4050 for a referral in your community.