(+)-4-propyl-9-hydroxynaphthoxazine (PHNO) is a new dopamine agonist which is capable of producing a sustained response in parkinsonian patients with "on-off" fluctuations when given as a continuous infusion either nasogastrically or intravenously. These data suggest that a sustained release formulation of PHNO may provide a significant, new treatment for patients with "on-off" fluctuations.
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R. Cruickshank (1953) studied this question.