Luo Bu Ma should not be drunk for a long time. It is suitable for the treatment of dizziness and edema caused by hyperactivity of the liver and Yang, as well as the symptoms of urinary discomfort. Modern medicine believes that rooibos has the effect of lowering blood pressure, slowing down the heart rate and enhancing the immunity of the body, so people often use rooibos to drink water in order to control blood pressure, but rooibos should not be taken in excess or for a long time to avoid poisoning. The toxicity of rooibos is mainly due to its main component contains anthraquinone, modern pharmacology that anthraquinones have an irritating effect on the rectal mucosa, long-term use and the development of rectal cancer. Now the incidence of rectal cancer is increasing year by year, and has leaped to the first place in the incidence of tumors. In daily life, we should avoid taking food and drugs that stimulate the rectal mucosa, especially laxative drugs, rooibos also contains anthraquinone, so it is not recommended to take rooibos for a long time.