Antidiarrheal medications include opioids and their derivatives, adsorbents, astringent protectants, and other antidiarrheal medications. There is no such thing as a “powerful antidiarrheal drug”, so please choose the most appropriate antidiarrheal drug under the guidance of your doctor. 1. Opioids and their derivatives: can inhibit intestinal peristalsis and propulsive contraction, which in turn slows down the speed of food propulsion, allowing sufficient time for water absorption, and ultimately play a role in stopping diarrhea. Such drugs include loperamide, phenethylpiperidine and so on. 2. Adsorbent: through the adsorption effect of the drug surface, and then absorb the intestinal bacteria, viruses, gases, exotoxins, to prevent their absorption by the intestinal mucosa, including medicinal charcoal. 3. Astringent protective agent: able to form a protective film on the intestinal mucosa to avoid the intestinal mucosa from being irritated. Including subcarbonate secretion, tannin, etc.. 4. Other antidiarrheal drugs: including lactasepsin, safranin, cholestyramine and so on. Patients who need to use antidiarrheal drugs for treatment are recommended to use drugs under the guidance of a doctor.