229. Does labetolol provide sufficient alpha blockade to use in high catechol states? / Dose and use of esmolol / Contraindications to esmolol / Dose of phentolamine January 21st, 2008 by reuben in .hypertension esmolol = breviblock phentolamine = regitine Back Top Tags: card 228. Indications for NTG in hypertensive emergency / Dose and problems with hydralazine / Action of labetolol / Labetolol dose 230. Nicardipine effect, dose, indications / Enalaprilat effect / 2 tests to consider in severe asymptomatic hypertension Leave a Reply Cancel reply Please post any discussion to the emupdates Reddit page.