Bradosol sugar-free lozenges combine a powerful antibacterial ingredient with menthol vapours to fight infection and to relieve your sore throat quickly and gently. How does it work? Bradosol sugar free lozenges contain the active ingredient benzalkonium chloride, which is an antiseptic and disinfectant agent. It is active against various bacteria. It kills micro-organisms that may be associated with various mouth and throat infections that cause a sore throat. The action of sucking the lozenge allows the active ingredient to work in the area of the discomfort, and also helps to coat, lubricate and soothe a sore throat. There are currently no other sore throat lozenges that contain just benzalkonium chloride available in the UK.