Thonzonium bromide is primarily used in the pharmaceutical and personal care industries. It is commonly found in medicated shampoos and topical solutions due to its antifungal and antimicrobial properties. This makes it effective in treating scalp conditions like dandruff and seborrheic dermatitis. Additionally, it is utilized in ear drops to address fungal or bacterial infections in the ear canal. Its ability to disrupt microbial cell membranes makes it a valuable ingredient in formulations aimed at controlling infections and maintaining hygiene.