Aricept is available in the U.S. in 5mg & 10mg streanths. It is approved for alzheimers disease. It increases acetyl-choline function (another neurotransmitter which is in a delicate balance with dopamine to prevent parkinsonian symptoms). It can have an adverse effect on some parkinsons people, so you may find some neuro's hesitant to use it. Jerry starr, Rph