Onset and end-of-dose levodopa-induced dyskinesias. Possible treatment by increasing the daily doses of levodopa.

Ballistic and dystonic involuntary movements occurring at the beginning and end of the period of levodopa efficacy are described in nine patients exhibiting dyskinesis during long-term levodopa therapy. In contrast to classical abnormal interdose movements, these biphasic dyskinesias were reduced by increasing and fractionating the daily doses of levodopa.