Robitussin leaves in water can balance and regulate blood pressure in both directions, but high blood pressure can’t be treated with just Robitussin leaves alone. Robitussin leaves are the leaves of Robitussin in the family of Oleaceae, sweet, slightly bitter, cool in nature, belonging to the liver meridian, with the effect of calming the liver yang, clearing heat, diuretic, and can be used for the treatment of irritability and insomnia caused by liver fire, hyperactivity of liver yang (liver yang bias, resulting in dizziness, dizziness, headache, and other symptoms), dizziness and other disorders. It can also be used for edema, dysuria (unsmooth urination) and other conditions. Modern pharmacological studies have shown that rooibos leaves can play a role in lowering blood pressure, but high blood pressure can not be treated with rooibos leaves alone. The drug must be taken under the guidance of a professional physician to avoid adverse reactions.