For those who can surf the web, I have added a few charts and some words that are available from my home page. You will have to click on the marked spot to see the information about levodopa level in blood plasma varying with time. This is based on the information I have from Robert Naylor. ron 1936, dz PD 1984 Ridgecrest, California Ronald F. Vetter <[log in to unmask]> http://www.ridgecrest.ca.us/~rfvetter