A low blood pressure of 90-100mmHg is classified as hypertension grade 1 and can be treated with beta-blockers, ACEIs or ARBs, and calcium antagonists. The so-called low pressure is diastolic pressure, is the lowest value of aortic pressure at the end of cardiac diastole, the normal range is 60-89mmHg. when the diastolic blood pressure is 90-100mmHg can be diagnosed as hypertension, mostly in the elderly, and peripheral vascular elasticity decline related. Hypertensive patients with elevated diastolic blood pressure can take the following medications to lower their blood pressure. 1. β-blockers: such as metoprolol and bisoprolol. Especially for patients with hypertension accompanied by rapid heart rate, this kind of drug is the first choice. 2. ACEI or ARB drugs: ACEI drugs are vascular converting enzyme inhibitors, representing drugs such as enalapril, fosinopril, etc.; ARB drugs are angiotensin II receptor antagonists, representing drugs such as valsartan, Irbesartan, etc. These two types of drugs can inhibit myocardial remodeling and protect cardiac function while treating hypertension. 3. Calcium antagonists: such as nifedipine, amlodipine, felodipine, etc., especially suitable for patients with hypertension accompanied by arrhythmia. It is recommended to choose and take antihypertensive drugs under the guidance of cardiologists, do not miss the dose, and cannot change the dosage of drugs casually.