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B. L. Beasley, MD; J. G. Nutt, MD; R. W. Davenport, MD; T. N. Chase, MD

Arch Neurol. 1980;37(3):155-156.

Abstract
• The effect of 2 to 6 g of tryptophan per day on levodopa-induced psychiatric symptoms was tested in nine patients with Parkinson's disease in a double-blind, placebo-controlled trial. The psychiatric disturbances were not greatly altered by administration of tryptophan.

Author Affiliations
From the Department of Neurology, US Public Health Service Hospital, Staten Island, NY (Drs Beasley and Davenport), the Department of Neurology, University of Oregon Health Science Center, Portland, Ore (Dr Nutt), and the Department of Neurology, National Institutes of Health, Bethesda, Md (Dr Chase).

Footnotes
Accepted for publication March 10, 1979.

Reprint requests to Department of Neurology, National Institutes of Health, Bethesda, MD 20014 (Dr Chase).

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