Benzalkonium chloride is a disinfectant with different dosage forms, both patch and solution, which inhibits bacterial metabolism and thus achieves sterilization. Effects of benzalkonium chloride: benzalkonium chloride solution is a broad-spectrum bactericidal agent, by altering the cell membrane, blocking the cell plasma of the cell, so that it kills the bacteria, and the killing effect is greater on the Gram-positive bacteria, and it has no effect on the Pseudomonas aeruginosa, acid-resistant bacilli, bacterial spores, and so on. Efficacy of benzalkonium chloride: it can be used for mucosal disinfection of surgery, disinfection of skin and mucosal wounds, disinfection of infected skin, vaginal douche, etc., but it can only be used externally, and can not be taken orally or by enema. In addition, it cannot be applied for a long time or extensively in mucosal wounds and inflamed areas. Benzalkonium chloride is not clear for children and the elderly, pregnant women and lactating women should use the drug under the supervision of a doctor, patients who are allergic to this drug should be prohibited from using it. After using the drug may occur allergic conjunctivitis, vision loss and other adverse reactions, need to stop the drug in time. The specific dosage and usage of the above drugs should follow the doctor’s instructions, and should not be used on their own to avoid adverse reactions.