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Acute tracheobronchitis is the acute tracheobronchial mucosal inflammation caused by biological, physical, chemical stimulation, and accompanied by symptoms of cough and expectoration. The capsule of alkaloids from leaf of Alstonia scholaris (CALAS), an effective part riches in alkaloids, has the antiviral, antibacterial, anti-inflammatory, expectorant, anti-tussive, anti-asthmatic, immunoregulation effects. However, whether the clinical indexes could be improved by the same ingredients anddoi:10.21203/rs.2.13848/v1 fatcat:htg44w5ttbeundazbbbip6mgjq