Qualitative differences in effects of opioids in man: preliminary evidence for multiple mechanisms of analgesic action

Pharmacology, Biochemistry, and Behavior
F V Abbott

Abstract

The analgesic effects of meperidine, anileridine, codeine and codeine + acetominophen on surgical and non-surgical pain in 101 patients were assessed using the McGill Pain Questionnaire. The quality of analgesia was determined by analyzing the changes in the pain descriptors chosen 1 hour after medication. Meperidine and anileridine differentially reduced pain qualities rated as "bright-phasic" by a student sample. Codeine and codeine + acetominophen produced similar patterns of analgesia that were homogeneous across "bright-phasic" and "dull-tonic" types of pain. The data suggest the possibility that opioids may differ in the quality of analgesia produced either as dose increases or different opioid receptor types are recruited.

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