Catnip, or catmint, was prepared as a tea in Western European medicines for use in relieving colds and colic and promoting sleep, particularly in children, as well as for pain and flatulence.
Reference:
Grieve, M. (Maud). A Modern Herbal; the Medicinal, Culinary, Cosmetic and Economic Properties, Cultivation and Folk-Lore of Herbs, Grasses, Fungi, Shrubs, & Trees with All Their Modern Scientific Uses. New York :Harcourt, Brace & company, 1931.