mizollen belongs to a group of medicines called "antihistamine" which is used most commonly in treating allergy type of reaction such as skin itchness, watery/itchy eyes. mizollen belongs to the 2nd generation antihistamine that has been designed to give a non-sedative drug action as compares with the first generation antihistamine. mizollen belongs to a group of medicines called "antihistamine" which is used most commonly in treating allergy type of reaction such as skin itchness, watery/itchy eyes. mizollen belongs to the 2nd generation antihistamine that has been designed to give a non-sedative drug action as compares with the first generation antihistamine.