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Dose-Dependent Behavioral, Hormonal, and Physiological Responses

Martin R. Cohen, MD; Robert M. Cohen, MD, PhD; David Pickar, MD; Herbert Weingartner, PhD; Dennis L. Murphy, MD

Arch Gen Psychiatry. 1983;40(6):613-619.

Abstract
• Hypotheses of involvement of the endogenous opioid system (EOS) in the regulation of human behavior suggest that functional blockade of the EOS should have behavioral consequences. Clinical administration of the opiate receptor antagonist naloxone hydrochloride, however, has had little or inconsistent behavioral effects in normals. This may be attributable to the use of doses insufficient to yield a complete EOS blockade. To assess this explanation, normals were administered increasing doses of naloxone hydrochloride (0.3 to 4 mg/kg) in a single-blind design. Significant dose-dependent behavioral, hormonal, and physiological effects were found. With increasing doses of naloxone, volunteers demonstrated increasingly dysphoric affects, a deterioration of performance on memory testing, increasing systolic BP and respiratory rate, and increasing plasma cortisol and growth hormone levels. These results are consistent with the expected effects of increasing EOS blockade, and thus suggest that lower doses of naloxone used in previous clinical studies may not have been sufficient to produce a complete EOS blockade. Specifically, they suggest involvement of the EOS in the tonic regulation of normal human mood, memory, BP, respirations, and plasma growth hormone and cortisol levels.

(Arch Gen Psychiatry 1983;40:613-619)

Author Affiliations
From the Clinical Neuroscience Branch (Drs M. Cohen and Pickar), the Clinical Neuropharmacology Branch (Drs R. Cohen and Murphy), and the Laboratory of Psychology and Psychopathology (Dr Weingartner), National Institute of Mental Health, Bethesda, Md.

Footnotes
Accepted for publication Dec 22, 1982.

Reprint requests to Clinical Neuroscience Branch, National Institute of Mental Health, Bldg 10, Room 4N214, Bethesda, MD 20205 (Dr M. Cohen).

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