* alt≥5 times of uln, level of total bilirubin≥3 times of uln, or cr≥1.5 times of uln. * patients with serious severe liver disease. * excluded who diagnosed as pneumonia patients with novel coronavirus infection of severe type and critical type. 【diagnostic criteria reference the official guideline "pneumonia diagnosis and treatment scheme for novel coronavirus infection (trial version 5) "】. * patients with previous history of severe gastrointestinal diseases such as gastric ulcers and bleeding. * patients with lactose intolerance. * patients who are allergic to the components of this medicine (major components: bromhexine hydrochloride; excipient: starch, lactose, magnesium stearate). * positive serum pregnancy test result for women with childbearing potential at screening or lactating women. * other circumstances that the researcher considers inappropriate to participate in this study.

* alt≥5 times of uln, level of total bilirubin≥3 times of uln, or cr≥1.5 times of uln. * patients with serious severe liver disease. * excluded who diagnosed as pneumonia patients with novel coronavirus infection of severe type and critical type. 【diagnostic criteria reference the official guideline "pneumonia diagnosis and treatment scheme for novel coronavirus infection (trial version 5) "】. * patients with previous history of severe gastrointestinal diseases such as gastric ulcers and bleeding. * patients with lactose intolerance. * patients who are allergic to the components of this medicine (major components: bromhexine hydrochloride; excipient: starch, lactose, magnesium stearate). * positive serum pregnancy test result for women with childbearing potential at screening or lactating women. * other circumstances that the researcher considers inappropriate to participate in this study.

- alt≥5 times of uln, level of total bilirubin≥3 times of uln, or cr≥1.5 times of uln. - patients with serious severe liver disease. - excluded who diagnosed as pneumonia patients with novel coronavirus infection of severe type and critical type. 【diagnostic criteria reference the official guideline "pneumonia diagnosis and treatment scheme for novel coronavirus infection (trial version 5) "】. - patients with previous history of severe gastrointestinal diseases such as gastric ulcers and bleeding. - patients with lactose intolerance. - patients who are allergic to the components of this medicine (major components: bromhexine hydrochloride; excipient: starch, lactose, magnesium stearate). - positive serum pregnancy test result for women with childbearing potential at screening or lactating women. - other circumstances that the researcher considers inappropriate to participate in this study.

- alt≥5 times of uln, level of total bilirubin≥3 times of uln, or cr≥1.5 times of uln. - patients with serious severe liver disease. - excluded who diagnosed as pneumonia patients with novel coronavirus infection of severe type and critical type. 【diagnostic criteria reference the official guideline "pneumonia diagnosis and treatment scheme for novel coronavirus infection (trial version 5) "】. - patients with previous history of severe gastrointestinal diseases such as gastric ulcers and bleeding. - patients with lactose intolerance. - patients who are allergic to the components of this medicine (major components: bromhexine hydrochloride; excipient: starch, lactose, magnesium stearate). - positive serum pregnancy test result for women with childbearing potential at screening or lactating women. - other circumstances that the researcher considers inappropriate to participate in this study.