A blood pressure of 177 (mmHg) systolic is dangerous. Especially the elderly and patients with underlying diseases. High blood pressure can easily cause cerebral hemorrhage, blood vessel rupture, heart failure and so on. It is recommended to go to the hospital in time for treatment. The normal value of systolic blood pressure in adults is 90 to 139 (mmHg) and diastolic blood pressure is 60 to 90 (mmHg). A systolic blood pressure of 177 (mmHg) is more dangerous. Especially for the elderly and patients with underlying diseases, high blood pressure can easily lead to cerebral hemorrhage, heart failure, rupture of blood vessels, etc., which can lead to death in serious cases. For patients with diabetes and renal insufficiency, the requirements should be more strict. Blood pressure 177 (mmHg) depends on whether there are symptoms, whether the measurement is accurate, whether there are irritating factors, etc., according to the situation of active treatment. Nifedipine, amlodipine, hydrochlorothiazide, furosemide and other drugs can be used to reduce blood pressure and avoid complications. Patients should consult the doctor in time to clarify the cause of the disease and actively control the condition. If you need to use drugs, you need to use under the guidance of a doctor.