Efficacy and safety of Jinzhen oral liquid (cough due to phlegmheat) in the treatment of acute bronchitis in children: a randomized, double-bind, parallel controlled, multicentric clinical trial

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•1\. Children who meet the diagnosis criteria of acute bronchitis in children;
•2\. Children who meet the diagnostic criteria of TCM syndrome of phlegm\-heat obstructing lung;
•3\. Age: 2\-14 years (\>\= 2 years, \< 15 years);
•4\. Cough (daytime \+ nighttime) score \>\= 4 points;
•5\. The course of disease is \<\= 48 hours, and antibiotics, antitussive and expectorant medicines and other TCM and Western medicines that have therapeutic effects on cough were not used before enrollment;
•6\. The informed consent process was in accordance with the regulations, and the legal representative or the child ( \>\= 8 years old) signed the informed consent jointly.

•1\. Children with severe bronchitis or early pneumonia;
•2\. Children with acute infectious diseases such as measles, pertussis and influenza
•3\. Children with diseases such as acute upper respiratory tract infection, suppurative tonsillitis, wheezing bronchitis, bronchial asthma, bronchiolitis pneumonia, tuberculosis, tumor
•4\. White blood cell count \> 12\.0 x 10^9/L, or large amount of purulent sputum;
•5\. Children with severe malnutrition and immunodeficiency;
•6 Children with severe primary diseases such as heart, liver, kidney, digestion and hematopoietic system;
•7\. Children who are allergic to components of Jinzhen oral solution and ambromoterol oral solution;
•8\. Children who are taking epinephrine, isoproterenol and other catecholamines;
•9\. Children who are taking MAO inhibitors or tricyclic antidepressants
•10\. Children who are taking non\-selective ß\-blockers such as Propranolol;

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