Long-term consumption of acarbose may lead to adverse reactions in the digestive tract, and individual patients may develop allergies and other conditions. Acarbose is one of the first-line therapeutic drugs for diabetes mellitus, which can delay the degradation of polysaccharides, oligosaccharides or disaccharides in the intestinal tract, thus leading to a decrease in postprandial blood glucose levels, and is mainly suitable for patients whose main food component is carbohydrates and who have an increased level of postprandial blood glucose. Prolonged oral administration of acarbose may cause adverse reactions in the digestive tract, manifested as abdominal distension, increased exhaustion, diarrhea, abdominal pain and so on, and a small number of patients may have allergic reactions, with manifestations of skin erythema and urticaria. It is contraindicated in patients who are allergic to the components of acarbose, patients with chronic gastrointestinal dysfunction with obvious digestive and absorption disorders, patients suffering from diseases that may worsen due to intestinal flatulence (such as severe hernia, intestinal obstruction and intestinal ulcer), and patients with severe renal insufficiency. Patients who need oral acarbose clinically should consult the endocrinology department of regular hospitals, and use this product under the guidance of doctors in a standardized manner.