Bad idea. Add medications should be used to treat add. However, there are children who misbehave due to impulsivity (reacting prior to thinking). Impulsivity can be treated with medication. I would strongly consider consulting with a child psychiatrist for child therapist to investigate your options.
ADHD is a neuro- developmental disorder with significant symptoms of Inattention &/or Hyperactivity/Impulsivity that start before age 10, last at least 6 mos. & harmfully impact academics, behavior &/or peer interaction at school & at home. Take a Positive Behavioral Supports parenting class, read "Little People" by Christopherson & ask pediatrician for referral to behavioral therapy/ behavior management training.