<prompt> Which of the following alpha-blocker drug is used in BPH without producing hypotension?DoxazosinPhentolamineTamsulosinTerazosin  <response>: Ans. C. Tamsulosina. Tamsulosin, Silodosinb. Higher affinity for a1A1D receptors found on prostate smooth muscle than for a1B subtype found on vascular smooth musclec. Minimal effect on blood pressured. High oral bioavailabilitye. Silodosin is a newer a1A blocker used in BPH. 