If a patient develops high blood pressure in the third trimester of pregnancy, lifestyle interventions can be initiated, such as low-salt and low-fat, keeping total salt intake to less than 6 grams per day, and controlling the rate of weight gain, as a person’s blood pressure tends to be directly proportional to his or her weight. After combining lifestyle improvements, the patient still fails to return to normal blood pressure, and this is the time to initiate antihypertensive medication. The preferred antihypertensive medication during pregnancy is methyldopa, and depending on the patient’s actual blood pressure, the dosage of the medication can be increased, as well as the frequency of its use. In addition, labetalol and nifedipine are the three types of antihypertensive medications that are currently recommended in the guidelines for use during pregnancy. If labetalol or methyldopa does not work well, it can be switched to nifedipine, which is relatively more potent.