This herbal infusion is traditionally used to help to relieve occasional stress and tension, can be used whenever you need a moment of relaxation. Lemon Verbena and it has many medicinal benefits such as increased defenses, to calm nerves, relieve pain, control allergies and improve digestion. Overview. Lemongrass is a plant. The leaves and the oil are used to make medicine. Lemongrass is used for treating digestive tract spasms, stomachache, high blood pressure, convulsions, pain, vomiting, cough, achy joints (rheumatism), fever, the common cold, and exhaustion. Jun 11, 2021