Evaluation of antitussive agents in man

Area of Science:

• Pharmacology
• Respiratory Medicine
• Biomedical Engineering

Background:

• Traditional antitussive drug efficacy assessment relies on subjective methods and simple cough counts.
• Objective evaluation of cough due to natural diseases, especially using advanced techniques, is limited.
• Existing methods lack the precision needed for robust drug development and validation.

Purpose of the Study:

• To present data from clinical trials using a novel objective methodology for cough quantitation.
• To evaluate the efficacy of antitussive drugs like guaiphenesin, bromhexine, and dextromethorphan.
• To establish the sensitivity and robustness of a computerized cough sound analysis system.

Main Methods:

• Conducted randomized, double-blind, placebo-controlled clinical trials for chronic bronchopulmonary and upper respiratory tract infections.
• Employed a standardized, validated computerized system for multidimensional cough sound acquisition and analysis.
• Quantified objective parameters including cough counts, intensity, latency, and total effort.

Main Results:

• Guaiphenesin and bromhexine demonstrated significant expectorant effects in productive cough (chronic bronchopulmonary disease).
• Dextromethorphan showed reproducible cough suppressant effects in non-productive cough (upper respiratory tract infections) after a single 30 mg dose.
• Objective measures confirmed drug efficacy, highlighting differences in speed and action.

Conclusions:

• The developed cough quantitation methodology provides objective and reliable data for evaluating antitussive treatments.
• This objective approach enhances the assessment of drug efficacy compared to traditional subjective methods.
• The system is sensitive and robust for the multidimensional analysis of cough and its treatment response.