The side effects of Irbesartan are as follows: 1. This drug may affect the nervous system, manifesting as dizziness, postural dizziness, etc. 2. It may affect the vascular system, and patients may experience upright hypotension. 3. It may affect skeletal muscle, connective tissue and bone abnormalities, and patients may experience skeletal muscle pain. 4. Patients taking this drug may experience headache, vertigo, tinnitus, abnormal liver function, joint pain, renal impairment, etc.