Traditional use for Lemon Verbena (also called Louisa in Greek) includes strengthening the lungs and soothe a volatile stomach. Its light citrus flavour makes it easy to drink hot or chilled.
According to WebMD,
Lemon verbena is used for digestive disorders including indigestion, gas, colic, diarrhea, and constipation. It is also used for agitation, joint pain, trouble sleeping (insomnia), asthma, colds, fever, hemorrhoids, varicose veins, skin conditions, and chills.
Lemon Verbena is used in western herbalism for destress and "reducing feverish colds."