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Research ArticleArticle

STUDIES OF ANALGESIC DRUGS. X. RESPIRATORY EFFECTS OF NARCOTIC ANTAGONISTS

Arthur S. Keats and Jane Telford
Journal of Pharmacology and Experimental Therapeutics January 1966, 151 (1) 126-132;
Arthur S. Keats
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Jane Telford
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Abstract

Nalorphine and (-)-3-hydroxy-N-propargylmorphinan (NIH 6045), two effective narcotic antagonists, were given intravenously in cumulative doses of 1.0 mg/kg as a supplement to thiopental-nitrous oxide anesthesia. Both compounds failed to produce the severe respiratory depression seen after morphine given in this manner and dose. In a complete crossover study of five normal volunteers, 10 mg of nalorphine intramuscularly depressed respiration to the same degree as 10 mg of morphine. In an incomplete crossover study in the same subjects, a cumulative dose of 1.0 mg/kg of nalorphine intravenously failed to produce dose-related respiratory depression, and the degree of depression was much less than that produced by a smaller dose of morphine. In contrast to morphine, nalorphine increased the slope of the respiratory stimulus-response curve. It was concluded that while both drugs are respiratory depressants in man, the ceiling effect for respiratory depression by nalorphine is considerably less than that of morphine. The implications of these observations were discussed.

Footnotes

    • Accepted July 30, 1965.
  • The Williams & Wilkins Comapny

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Journal of Pharmacology and Experimental Therapeutics
Vol. 151, Issue 1
1 Jan 1966
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Research ArticleArticle

STUDIES OF ANALGESIC DRUGS. X. RESPIRATORY EFFECTS OF NARCOTIC ANTAGONISTS

Arthur S. Keats and Jane Telford
Journal of Pharmacology and Experimental Therapeutics January 1, 1966, 151 (1) 126-132;

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Research ArticleArticle

STUDIES OF ANALGESIC DRUGS. X. RESPIRATORY EFFECTS OF NARCOTIC ANTAGONISTS

Arthur S. Keats and Jane Telford
Journal of Pharmacology and Experimental Therapeutics January 1, 1966, 151 (1) 126-132;
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