Any antihypertensive drug has side effects, only different antihypertensive drugs have different side effects. Angiotensin-converting enzyme inhibitor (ACEI class) antihypertensive drugs commonly cause irritant cough and angioedema; angiotensin receptor antagonist (ARB class) antihypertensive drugs hardly cause irritant dry cough, but angioedema may also occur. The antihypertensive drugs of these two classes may also cause hyperkalemia. The most common side effect of beta-blockers is bradycardia, and then another is bronchospasm. Therefore, they should not be used for people with bradycardia or asthma. The main side effects of calcium antagonists are facial flushing, headache, heartburn, and edema of the ankles. The most common side effect of diuretics is that they can cause dehydration, low potassium and sodium, and elevated blood uric acid. Another type of antihypertensive drug is also commonly used to help lower blood pressure, such as spironolactone, the most common side effect of this drug is hyperkalemia, and long-term use may also affect the endocrine metabolic system. Another type of antihypertensive drug is an alpha-blocker, such as terazosin, and the most common side effect is postural hypotension. For different side effects of antihypertensive drugs, pay attention to these side effects in the process of taking antihypertensive drugs, and once they appear, it is best to find a doctor to make adjustments according to the specific situation.