Calagy D Lotion is a prescription medicine used to treat allergic skin conditions. It works by blocking the effects of a chemical messenger (histamine), and provide relief fro symptoms of skin allergy such as skin irritation. Calagy D Lotion should be used in the dose and duration as advised by your doctor. Wash your hands before using this medicine. It is advised to check the label for directions before use. It is for external use only.