Tusbest Sugar Free Mint Cough Syrup 100 ml is a combination of two drugs, namely: Levodropropizine and Chlorpheniramine maleate. Levodropropizine belongs to the class of cough suppressants that works by blocking the transmission of nerve signals from the cough centre in the brain to the muscles that produce cough, thereby decreasing the urge to cough. Chlorpheniramine maleate belongs to the class of antihistamines (anti-allergic drugs) that works by blocking the action of histamine, a substance responsible for causing allergic reactions. It helps to provide relief from symptoms of allergy such as sneezing, running nose, watery eyes, itching, swelling, and congestion or stiffness. Together, Tusbest Sugar Free Mint Cough Syrup 100 ml provides relief from cough.