2. Because green tea contains more tannic acid, it will decompose drugs, change the efficacy, and affect the absorption of drugs at the same time, resulting in a decline in therapeutic effect. Moreover, green tea tastes cold, which is especially suitable for people with weak spleen and stomach, cold and constipation. Pay special attention not to drink green tea. Patients with kidney calculi can't drink green tea or other tea drinks, which may aggravate stones. If the patient must drink green tea, it is recommended to drink tea after 1~2 hours to reduce the influence of green tea. In addition to not drinking green tea, not eating greasy, spicy, stimulating and cold food, and avoiding alcohol and cigarettes, these will affect the absorption of drugs.