Lansoprazole is an acid-suppressing drug, and its common adverse reactions are mainly the following: First, allergic reactions, occasionally rash, itching and other symptoms. Please stop using the drug if symptoms appear. Second, hematological system, occasionally anemia, leukopenia, eosinophilia and other symptoms. Thrombocytopenia rarely occurs. Third, the digestive system, occasional constipation, diarrhea, thirst, bloating, etc., may also appear alkaline phosphatase, lactate dehydrogenase rise, if there are abnormal phenomena should be immediately discontinued. Fourth, the mental nervous system, occasional headache, drowsiness and other symptoms, insomnia, dizziness and other symptoms rarely occur. Fifth, the genitourinary system, can appear frequent urination, proteinuria, etc. Sixth, the occasional fever, the rise of total cholesterol, uric acid and other symptoms.