Effectiveness of Currently Available Symptomatic Antitussives Against Chronic Cough

4 Effectiveness of Currently Available Symptomatic Antitussives Against Chronic Cough 

Codeine vs placebo Aylward et al. (1984) 8 Chronic bronchitis Decrease in coughs by 40% at 30-mg dose (p 0.05) 

Codeine vs placebo SeveUus et al. (1971) 12 COPD Decrease in coughs by 60% (p 0.001) 

20 mg dextrometorphan vs 20 mg codeine Matthys et al. (1983) 16 Chronic bronchitis Decrease in cough intensity dextrometorphan codeine p 0.0008) 

Levodropropizine AUegra and 194 Acute and Decrease in cough severity. 

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