Clohexine dry mix suspension is a compound preparation, the main ingredients include cefaclor and bromohexine hydrochloride. Cefaclor is an antibacterial drug belonging to the cephalosporin class, which is the second generation of cephalosporin and has antibacterial activity against Staphylococcus aureus, Streptococcus haemolyticus, Streptococcus griseus and Staphylococcus epidermidis, and also has certain antibacterial effect on some negative bacteria. The antibacterial mechanism of cefaclor is mainly through inhibiting the synthesis of bacterial cell wall and exerting antibacterial activity. Another component of Clohexine dry suspension, bromohexine hydrochloride, can cause the fibrosis and lysis of mucopolysaccharide in sputum, resulting in a decrease in sputum viscosity and an increase in sputum secretion, thereby thinning the sputum and making it easy to cough up and open the respiratory tract. It is mainly used for patients with respiratory tract infections caused by sensitive bacteria and with sticky sputum that cannot be easily coughed out, and it has both antibacterial effects and the effect of promoting sputum coughing.