Benzalkonium bromide tincture is applied to the local skin, more commonly used in pre-surgery skin surface disinfection, coloring. Benzalkonium bromide tincture belongs to the compound preparation, in which the main ingredients are benzalkonium bromide, ethanol, belongs to a kind of topical drugs, mainly skin disinfectant, generally more commonly used in the clinic for disinfection of the skin surface before surgery and coloring. The specific dosage of the drug needs to be combined with the body’s condition, under the guidance of the doctor to use. The drug belongs to the external skin disinfectant, can not be taken internally. It should not be stored in plastic or aluminum containers. Occasionally, allergic reactions occur when using the drug. It is contraindicated for those who are allergic to the product. The drug is contraindicated with soaps and other cationic surfactants, citrates, permanganates and alkaloids.