The following side effects may occur after taking hypertensive drugs: 1, gastrointestinal symptoms: nausea, vomiting, abdominal pain, etc.; 2, central symptoms: headache, dizziness, etc.; 3, blood pressure changes: postural hypotension; 4, allergic phenomena: chills, chills, rash allergy, etc.; 5, blood changes: low or high potassium in the blood, causing cardiac discomfort; 6, kidney damage: water sodium retention, causing kidney damage, serious can lead to the occurrence of uremia; 7, cardiovascular and cerebrovascular diseases: elderly patients with hypertension, especially in the early morning hypovolemia, after taking hypertensive drugs may appear cardiovascular events or cerebrovascular events, the heavier patients may cause cerebral infarction, myocardial ischemia and other serious consequences.