From the Manufacturer:
As a hot infusion, the flowers are sweat-inducing and in combination with yarrow and mint are specific for colds and flu. The flowers are used to treat bronchial and upper respiratory disorders as well as hayfever. A cold infusion of the flowers can be used as a compress for chilblains. (Chilblains are the inflammation of the toes, feet, or fingers, due to the presence of a cold.) The ointment of Elderflower is soothing, cooling and healing, used for irritations of the skin. Considered to have a mild laxative action and may be used for rheumatism and gout.