Normally high pressure 120mmHg low pressure 90mmHg is normal blood pressure, generally do not need to take antihypertensive drugs. If you take antihypertensive drugs to reduce to low pressure 78mmHg high pressure 110mmHg, generally there will be no adverse reactions. However, antihypertensive drugs themselves have adverse effects that may cause patients to develop hypokalemia, hypercalcemia, and bradycardia. Normal people have high pressure (systolic blood pressure) of 90~140mmHg and low pressure (diastolic blood pressure) of 60~90mmHg. Normally, a blood pressure of 120/90mmHg is considered to be normal, and antihypertensive medications are not required. If you have taken antihypertensive drugs under the guidance of a doctor to lower your blood pressure to 110/78mmHg, you will not have any adverse reactions. However, due to the antihypertensive drugs themselves have certain adverse reactions, such as hydrochlorothiazide, furosemide and other diuretics also cause hypokalemia, hypercalcemia, hyperglycemia and other adverse reactions, metoprolol, atenolol and other β-blockers can cause bradycardia, induced bronchial asthma, hyperglycemia and other adverse reactions. If you are taking antihypertensive drugs on your own, you may lower your blood pressure further, possibly causing hypotension and symptoms such as dizziness, blurred vision, nausea, and fatigue. For people whose usual blood pressure is 120/90mmHg, they usually do not need to take antihypertensive drugs, and it is recommended that they do not self-medicate.