Dizziness is not normal when high blood pressure suddenly drops. If dizziness occurs after high blood pressure is suddenly lowered, there may be several reasons as follows: 1. The blood pressure is lowered too much, at this time, the cerebral blood perfusion is not good, the brain tissue is in relative ischemic state, it will cause the symptom of dizziness due to the temporary insufficiency of blood supply, or postural hypotension. 2. Blood pressure is lowered too fast, although the blood pressure is within the normal reference value after antihypertensive treatment, but due to the rapid fall of blood pressure in a short period of time, it will also affect the cerebral blood flow temporarily, resulting in transient cerebral blood supply insufficiency. 3. The performance of adverse drug reactions, some antihypertensive drugs on the intracranial vasodilator effect is relatively strong, such as nimodipine, flunarizine capsules, etc., some patients take this kind of drugs after the drop in blood pressure, but a little bit of dizziness, bloating and montage feeling. This discomfort will gradually disappear after tolerating such drugs. High blood pressure patients must be in the doctor’s guidance under the standardization of medication, taking antihypertensive drugs can not be missed, can not change the dosage and type of medication, medication in accordance with the doctor’s instructions. If you feel unwell, you should consult a doctor and follow the doctor’s instructions.