Chronic use of levodopa may be complicated by dyskinesias, on-off effect, or hallucinosis. Transient levodopa withdrawal (drug holiday) may increase motor responsiveness and decrease levodopa-induced side effects, and the improved state may persist for as long as 9 months. After 1 year, parkinsonian signs approached pre-holiday levels, and two of the patients required a second drug holiday; side effects began to reappear 9 to 12 months after the holiday. Four of six patients with psychiatric complications remained free of hallucinations for the entire year.
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Koller et al. (1981) studied this question.