Deletus BL Peppermint Flavour Syrup 100 ml contains Bilastine, Dextromethorphan and Phenylephrine, which are used to provide relief from acute cough and upper respiratory symptoms, including nasal congestion, associated with allergy or the common cold. Here, Dextromethorphan affects the signals in the brain that trigger the cough reflex, Phenylephrine shrinks blood vessels in the nasal passages, And Bilastine blocks the effects of a chemical messenger known as 'histamine', which is naturally involved in allergic reactions.