Hypertensive emergencies are patients due to certain triggering factors that lead to a sudden increase in blood pressure to more than 180/120mmHg, this is very dangerous, it is recommended that patients should be treated in a timely manner in the hospital for controlled hypotension, generally will first choose intravenous antihypertensive drugs for controlled hypotension, oral drugs itself metabolic cycle is relatively long, the amount of bad control, for the existence of complications of the population, the danger is relatively Oral drugs have a long metabolic cycle and the amount is not well controlled. The metabolic cycle of intravenous drugs, such as sodium nitroprusside and uradil, is relatively fast, allowing for timely adjustment of the drug regimen. The first choice of oral medications for patients after seeking medical attention can be Bexinostat, Niftazin, etc., which can be taken sublingually to rapidly lower blood pressure if necessary.