Nifedipine tablets, amlodipine benzenesulfonate tablets, methyldopa tablets and other medicines can be used to lower blood pressure when you are pregnant. 1. Nifedipine tablets: clinical research shows that nifedipine tablets can be used in pregnancy hypertension, which can diastole peripheral resistance blood vessels, reduce peripheral resistance, so that the blood pressure is reduced, reduce the cardiac afterload, the use of attention to nifedipine allergy is prohibited. 2. Amlodipine benzenesulfonate tablets: Clinical studies have shown that amlodipine benzenesulfonate tablets can be used in pregnant women with hypertension, which can block extracellular calcium ions of cardiac muscle and smooth muscle to enter into intracellular membrane through cell membrane calcium ion channels, relaxing vascular smooth muscle. 3. Methyl dopa tablets: clinically can be used for pregnant women with hypertension, its antihypertensive mechanism may be through its active metabolite methyl norepinephrine to stimulate the central and thus reduce plasma renin activity, thereby reducing arterial blood pressure. The above drugs need to be used under the guidance of a doctor, the specific treatment program, need to be carried out under the guidance of a doctor, in order to better treat the disease, do not blindly use their own medication, in order to avoid adverse effects.