Dequalinium chloride is widely used as an antiseptic and disinfectant, particularly in the treatment of infections in the mouth and throat. It is commonly found in lozenges and mouthwashes, where it helps to reduce bacterial and fungal growth, providing relief from sore throats and oral infections.

In gynecology, dequalinium chloride is utilized in the form of vaginal tablets or suppositories to treat bacterial vaginosis and other vaginal infections. Its antimicrobial properties help to restore the natural balance of the vaginal flora.

Additionally, it is used in topical creams and ointments for skin infections, where it effectively combats bacteria and fungi, promoting wound healing and preventing further infection.

Dequalinium chloride is also employed in the preservation of cosmetic products, where it acts as a preservative to prevent microbial contamination and extend the shelf life of the products.

Its broad-spectrum antimicrobial activity makes it a valuable component in various medical and personal care applications.