Eli5 If adhd is caused by a lack of dopamine produced in the brain, why can’t we use dopamine promoter medication like we do with Parkinson’s for treatment?

Question

Eli5 If adhd is caused by a lack of dopamine produced in the brain, why can’t we use dopamine promoter medication like we do with Parkinson’s for treatment?

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just giving a simpler version l of what others have said:

Parkinson’s is an overall lack of dopamine which serves many functions in the brain. ADD/ADHD is disordered/dysfunctional *delivery* of dopamine mostly in the “reward center” of the brain.