Lohist Tablet contains the active substance loratadine which belongs to a class of medicines called "antihistamines". Lohist tablets help to reduce your allergy symptoms by stopping the effects of a substance called "histamine", which is produced in the body when you are allergic to something. Lohist Tablets relieves symptoms associated with allergic rhinitis (for example, hay fever), such as sneezing, runny or itchy nose, and burning or itchy eyes.