The most popular and widely acclaimed guide for parkinsonian patients and their families is now in its thoroughly updated Fifth Edition. In layperson's terms, Drs. Duvoisin and Sage explain the pathology, symptoms, and course of Parkinson's Disease, discuss current drug therapies and surgical procedures, and examine the latest research on the genetics of parkinsonism.This edition features completely rewritten chapters on genetics and on surgery for Parkinson's Disease. New drugs and improvements in levodopa therapy are described, and a new chapter addresses the question of whether levodopa affects disease progression. An appendix lists the trade names, generic names, and formulations of commonly prescribed drugs.