Dopamine and Ritalin

Posted By James Evans on December 05, 1998 at 09:21:51:







I was reading the November 30, 1998 issue of Time and came across a very interesting article.  It seems that researchers suspect that Attention-deficit/hyperactivity disorder (ADHD) stems from an inadequate supply of dopamione and norepinephrine in the brain-a hypothesis that is supported in part by the fact that Ritalin boosts dopamine levels.
My question would be this.  Has anyone heard of any research done on the use of Ritalin with Parkinsons patients.  The definetion of Parkinson's Disease below was taken from the medhelp.org website:
Parkinson's disease is a degenerative disease of the nervous system which involves a very small region of the brain called the substantia nigra. This area is part of a complex group of circuits in the brain which are involved in movement, and in particular movements we generally are not conscious of -- such as posture, balance, the degree of stiffness or flexibility needed in a limb. With loss of cells in the substantia nigra, a key neurotransmitter -- dopamine -- becomes deficient, and patients develop problems with stiffness, decreased movements, tremor, falling and decreased facial expression.
Any help in this matter is greatly appreciated.