Large doses can lead to addiction. Coming off the drug at the end of the day leads to mood swings. Can impair height growth, cause insomnia, loss of appetite, and nausea, etc. It is a short term fix and does not fix a learning disability or emotional problem. A pill alone doesn't meet the basic care a child needs.
Some treatment can be haphazard and there is no follow-up or counseling.
Psychiatric drugs used to help young children have not been tested properly and are not approved by the FDA for pediatric use under 6 years of age. Effectiveness is usually by trail and error. Effective parenting and appropriate education. Individual and family therapy and a different diet may be helpful. Adjust accordingly if needed.