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. 2007 Feb;7(1):32-6.
doi: 10.1097/ACI.0b013e3280115145.

Codeine and cough: an ineffective gold standard

Donald C Bolser  1 , Paul W Davenport
Affiliations

Codeine and cough: an ineffective gold standard

Donald C Bolser et al. Curr Opin Allergy Clin Immunol. 2007 Feb.

Abstract

Purpose of review: Cough is one of the most common reasons why patients visit physicians. The opioid codeine has been a mainstay in the treatment of cough for decades and this drug is widely regarded as the 'gold standard' cough suppressant.

Recent findings: Recent placebo-controlled studies have shown that codeine is no more effective than placebo in suppressing cough caused by either upper respiratory disorders or chronic obstructive pulmonary disease. These recent reports are not consistent with several older placebo-controlled studies that demonstrated the efficacy of codeine. The reasons for this difference are not fully understood.

Summary: We propose that these differences, as well as results from animal models, can be explained by the existence of a complex hierarchical control system that regulates the expression of coughing. This system, known as a holarchy, is composed of regulatory elements known as 'holons' that interact with one another to regulate cough. Based on work in animal models, codeine is proposed to act on an intermediate order holon that may not be critical for coughing under some situations in humans. Testing of this hypothesis and further elucidation of the control system for cough will represent an important direction for future research in this area.

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Figures

Figure 1
Figure 1. Proposed holarchical organization of the central cough generation mechanism
The model shows multiple control elements for cough (holons) that are organized in a hierarchical manner. Holons are functional entities made up of neural substrates (axonal pathways, groups of neurons, and nuclei) that mediate a particular control mechanism. The model can account for sensations during cough, voluntary cough, the actions of codeine in animal models, and the recent difficulties in demonstrating the efficacy of codeine in humans. We propose that codeine acts primarily on an intermediate order holon that is either not a dominant controller of cough in awake humans or controls cough in humans only in specific situations. The model can be tested (see text).
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