| Reference | Objective | Design | Evidence |
|---|---|---|---|
| Smith et al. [237] | To assess the effects of oral over‐the‐counter cough preparations for acute cough. | MA | 1A− |
| Smucny et al. [238] | To determine whether beta2‐agonists improve the symptoms of acute bronchitis in patients who do not have underlying pulmonary disease. | MA | 1A+ |
| Ponsioen et al. [239] | To investigate the short‐term effects of an inhaled steroid (fluticasone propionate (FP)) on cough | RCT | 2A+ |
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