Irbesartan is an angiotensin II receptor antagonist with the following major side effects: 1. neurological symptoms, such as dizziness, headache, dizziness, and brain swelling. 2. patients may develop skin allergies, such as allergic urticaria or neuroedema. 3. certain gastrointestinal reactions may occur. For example, nausea, vomiting, acid reflux, heartburn, bloating, diarrhea, indigestion, and loss of appetite. 4. Patients may experience tachycardia and arrhythmia, but the above cases are relatively rare. 5. Patients may experience changes in serum, creatinine, potassium, and urea nitrogen, but these side effects are relatively more rare.