Table above is from Focused Update on Pharmacologic Management of Hypertensive Emergencies 2018
You will see recommendations for reducing by 10-15% within the first hour. Important fact is not to decrease by MORE than 25% within the first hour.
Clinical features in the management of selected hypertensive emergencies 2006
Section 6.2 Hypertensive Emergencies and Severe Hypertension in Nonpregnant and Nonstroke Patients
In a propensity-matched sample controlling for patient and BP characteristics, treated patients had higher rates of subsequent acute kidney injury (466 of 4520 [10.3%] vs 357 of 4520 [7.9%]; P < .001) and myocardial injury (53 of 4520 [1.2%] vs 26 of 4520 [0.6%]; P = .003)
There was no BP interval in which treated patients had better outcomes than untreated patients.