The most likely reason for low blood pressure after taking blood pressure lowering medication is that the type of antihypertensive medication chosen is inappropriate or the dosage of antihypertensive medication is too high. Generally, for mild hypertension, that is, systolic blood pressure of about 140-160 mmHg, patients can be given lifestyle and dietary modifications to actively control blood pressure, pay attention to rest and appropriate exercise. In this mild hypertension, if you take strong antihypertensive drugs, you may experience a transient decrease in blood pressure, and you need to stop and adjust the medication. In addition, the dosage of antihypertensive drugs is relatively large, perhaps 40mg is recommended and 80mg is taken, this doubled dosage may cause a transient decrease in blood pressure. There is no adjustment of the amount of blood pressure medication and the variety of medication, but the patient has a poor diet, drinking too little water, etc. caused by the reduction of blood volume, there can also be low blood pressure phenomenon, this time to actively replenish the amount of fluid.