Robitussin can treat high blood pressure, Robitussin contains catechu, potassium, rutin and other substances beneficial to lowering blood pressure, renal hypertension has a significant and long-lasting antihypertensive effect. Hypertension caused by headache, dizziness, brain swelling, insomnia, dreaming and swelling has a better relief, and the substances it contains can increase the serum peroxidase enzyme vitality, remove excessive oxygen free radicals in the body, reduce the load on the heart, to achieve the effect of lowering blood pressure. At the same time, rooibos contains flavonoids, can enhance capillary resistance, enhance vascular elasticity, and can expand the coronary arteries, increase coronary blood flow, so it can reduce blood pressure.