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If a person takes dopamine increasing medication for some illness, what effect will it have on his/her mental health considering that medication doesn't target just one area of the brain ?

In Parkinson's disease, dopamine is lacking in the brain area responsible for motor functions i.e. muscle movement hence creating spasms in muscles. Dopamine medication corrects this but it doesn't target just that area of the brain.

I'm curious what happens with all the dopamine roaming in other parts of the brain, and how it affects mental health?

EDIT: I've made some changes, I hope it's more understandable now.

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Can you be more specific about which "dopamine-based" medication that you are talking about? Different medication classes are going to have different pharmacodynamics. –  Chuck Sherrington May 12 '14 at 13:06
I've added more detail in the question, also I've changed title and text a bit, I misunderstood the way medication works and what it contains. Thank you for asking, it led me to improve my question. :) –  JunJun May 12 '14 at 13:55
Could this question also just be rephrased as "why is dopamine used to treat Parkinson's?" or are you more curious about the side-effects associated with this increased dopamine? –  Seanny123 Feb 24 at 13:09
@Seanny123 I understand the purpose of medication, to supply dopamine since there is not enough dopamine naturally. I'm more concerned how excess of dopamine affects the brain. I.e. when enough dopamine is added , what rest of it does to other areas of the brain. Since medication doesn't target area lacking dopamine, but whole brain. So it must be excessive in some areas. I hope I explained better. :) thanks for your question, I might need to rephrase it anyway. –  JunJun Feb 25 at 14:03
@JunJun an edit to reflect this would be helpful –  Seanny123 Feb 25 at 15:07

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