Berberine, which means berberine hydrochloride, works on human body mainly against intestinal infections caused by dysentery bacillus and E. coli bacteria, and is used as prescribed by doctor. Berberine hydrochloride has antibacterial effect, but it is effective against intestinal infections caused by Escherichia coli and dysentery bacilli, and is suitable for the treatment of gastroenteritis and other intestinal infectious diseases. The drug is contraindicated in people who are allergic to the product, patients with hemolytic anemia and patients with glucose-6-phosphate dehydrogenase deficiency, and is used with caution in women in the first trimester of pregnancy. Adverse reactions are generally rare after oral administration, and occasionally nausea, vomiting, rash and fever may occur, disappearing after discontinuation of the drug. Specific use of the drug should be carried out under the guidance of a specialist, not unauthorized use of the drug.