There are more drugs available for elevated blood pressure during lactation, and nifedipine is recommended as the first choice. Nifedipine is a calcium antagonist, which can make the peripheral blood vessels diastolic, thus reducing the resistance of the blood vessels and playing a role in lowering blood pressure. You can also choose propranolol or benazepril. The antihypertensive principle of propranolol is to reduce the blood circulation by decreasing the filtration rate of the glomerulus, which can also reduce the blood flow in the coronary arteries and other organs, thus achieving the effect of lowering blood pressure. Benadryl hydrochloride is an angiotensin-converting enzyme inhibitor that inhibits angiotensin-converting enzyme and reduces the resistance of peripheral blood vessels, thus achieving a blood pressure-lowering effect. While taking medication to control blood pressure during pregnancy, you should pay attention to a low-salt diet and also eat more celery, a vegetable that helps lower blood pressure.