Most medical doctors get involved with medication. Psychologist and teachers work on the other treatments and they all must be coordinated. Since I am a medical doctor I will discuss medications. There have been many studies in several countries sincerely looking for this information and none have found evidence to support the claim that doctors are over-prescribing stimulant medications for children. Recent advances with modern brain scans and isotope tracers show the defect in ADHD to be a lack of normal circulation in the prefrontal cortex of the brain.
Chemical tests show lower than normal levels of dopamine in that section of the brain.
This blocking effect allows these chemicals to accumulate to more normal levels. And the clinical picture usually confirms that hypothesis. Treatment with stimulants makes most everyone function a little better. But if the diagnosis of ADHD is made and one does not do well with stimulant medications another diagnosis needs to be looked for. Medication is just one part of the treatment.