<prompt> Drug not useful in hypeensive emergency is:HydralazineIndapamideSublingual nifedipineClevidipine  <response>: Indapamide is a thiazide diuretic agent, used in uncomplicated hypeension. In a hypeensive emergency, BP should be reduced by not more than 25 within minutes to hours and the to 160100mm Hg within 2-6 hours. Clevidipine, hydralazine, sod. nitroprusside, GTN, SL nifedipine, Esmolol etc are used REF. Essentials of medical pharmacology K D TRIPATHI 8th Edition 