Saccharomyces boulardii clinical common dosage form for the bulk, patients taking the drug occasionally see urticaria, allergic reactions, intractable constipation, dry mouth, rare side effects such as fungemia, angioedema, skin rash. Saccharomyces boulardii powder is a microecological preparation containing live Saccharomyces boulardii, clinically mainly used for the treatment of diarrhea in children and adults, also has a certain therapeutic effect on the symptoms of diarrhea caused by intestinal flora imbalance. The side effects of this drug are as mentioned above, patients should seek medical advice if any discomfort occurs during the administration of the drug, persists without relief, or if the symptoms are more serious. It should be noted that the use of Saccharomyces boulardii is prohibited in patients who are allergic to any of the components of the drug, intolerant to fructose, those with central venous catheter infusion, patients with impaired glucose or galactose absorption syndrome, patients with congenital galactosemia, and those with lactase deficiency. Patients should take Saccharomyces boulardii powder as prescribed by the doctor and avoid self-medication to avoid inducing side effects.