Patients with hypertension should not donate blood even after taking antihypertensive medication, because the medication will circulate in the patient’s blood and donating blood will cause the medication to run into the recipient’s blood, which may cause the recipient’s blood pressure to drop or produce other side effects. Blood donation in hypertensive patients will reduce the blood volume, and the body’s own compensatory mechanism will increase blood pressure, leading to blood pressure fluctuations, while hypertensive patients are often combined with atherosclerosis and dyslipidemia, and the slowing down of blood flow after blood donation may lead to coronary heart disease, angina attack, or thrombosis. Patients with hypertension are not suitable to donate blood even if their blood pressure is normal after taking antihypertensive drugs.