The invention relates to application of an aucklandia-
coptis pill extract in preparing drugs for treating intestinal
flora alternation diseases, especially for intestinal microflora alternation caused by
antibiotics, and belongs to the field of application of traditional compound Chinese
medicine preparations. Firstly, an ethyl
alcohol extracting solution and residues are extracted by adopting ethyl
alcohol refluxing from a raw aucklandia-
coptis pill, then the residues are extracted with water to obtain an aqueous extracting solution, and finally, the ethyl
alcohol extracting solution and the aqueous extracting solution are combined to obtain the aucklandia-
coptis pill extract. The aucklandia-coptis pill extract as a
drug for treating the intestinal
flora alternation diseases has a good
curative effect, and can significantly ameliorate the symptoms of antibiotic-associated
diarrhea while significantly increasing intestinal beneficial microbiota and improving the intestinal microenvironment.