<prompt> Alpha 1 blocker without any effect on blood pressure is?TamsulosinPrazosinOxazocinTerazocin  <response>: ANSWER: A TamsulosinREF: KDT 7th ed p. 135, Goodman Gillmans 11th ed p. 173Tamsulosin, a benzenesulfonamide, is an al receptor antagonist with some selectivity fora1A and a1D subtypes, favoring a1A blockade in prostate. Tamsulosin is efficacious in the treatment of BPH with little effect on blood pressure, 