Huangliansu should be taken about 30 minutes after meals. The generic name of Huangliansu is berberine, which is the main active ingredient in the Chinese herb Huanglian. Clinically, Huangliansu is mainly used for the treatment of dysentery bacilli, as well as intestinal infections caused by Escherichia coli, gastroenteritis and diarrhea. The side effects of Flavopiridol include gastrointestinal reactions, skin and allergic reactions, among which gastrointestinal reactions are the most important adverse reactions of Flavopiridol, manifested as nausea, vomiting, stomach discomfort, etc. Taking Flavopiridol after meals can effectively reduce the side effects of Flavopiridol. In addition, tannin can combine with safranin to form insoluble precipitate, which is not conducive to the absorption of the drug and reduces the therapeutic effect of the drug. Therefore, when taking the drug, it should be served with water and not with tea, juice, coffee, milk and other beverages.