Acute gastroenteritis patients can be treated with safranin, which is mainly effective for acute gastroenteritis caused by bacterial infections, especially those caused by dysentery bacillus or E. coli infection. The chemical name of Huang Lian Su is Berberine Hydrochloride, an alkaloid extracted from Huang Lian and Phellodendron, which has a strong inhibitory effect on Gram-negative bacteria such as E. coli and E. dysenteriae, and can be used to treat acute gastroenteritis. If the gastroenteritis is not caused by bacterial infection but by other factors, such as viral infection, treatment with Phellodendron is ineffective at this time. For physiological diarrhea, it is also recommended that instead of oral administration of flavopiridol, treatment with drugs that regulate intestinal flora, such as probiotics, can be used. For patients with acute gastroenteritis, a light diet is recommended, avoiding cold, sour, spicy and irritating foods, and drinking more water.