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The powerful placebo in cough studies?
1Common Cold Centre, Cardiff School of Biosciences, Cardiff University, Cardiff, CF10 3US, UK. eccles@cardiff.ac.uk
Pulmonary Pharmacology & Therapeutics
|July 9, 2002
Summary
Placebo treatments significantly reduce cough symptoms, accounting for 85% of relief in upper respiratory tract infections. Further research into placebo effects and endogenous opioid neurotransmitters is warranted for better cough treatments.
Area of Science:
- Pharmacology
- Neuroscience
- Clinical Medicine
Background:
- Placebo treatments show significant efficacy in various conditions, improving symptoms in 30-40% of patients.
- Antitussive medicine trials reveal that placebo effects contribute substantially to cough reduction.
Purpose of the Study:
- To propose a model explaining placebo's antitussive effects.
- To investigate the role of endogenous opioid neurotransmitters in placebo-mediated cough suppression.
Main Methods:
- Review of 8 clinical trials on antitussive medicines for acute upper respiratory tract infections.
- Analysis of placebo's contribution to cough reduction compared to active ingredients.
- Exploration of existing research on placebo effects in analgesia and endogenous opioid pathways.
Main Results:
- Placebo accounted for 85% of cough reduction, while active ingredients contributed only 15%.
- The placebo effect in analgesia is potentially mediated by endogenous opioid neurotransmitters.
Conclusions:
- The placebo effect significantly influences cough suppression, likely via endogenous opioid pathways.
- Further research into placebo mechanisms is crucial, given the limited contribution of active ingredients in current cough treatments.