<prompt> Wrong about prazosin is :a2 presynaptic blockerOrally effectiveMetabolised in liverFirst dose effect may occur  <response>: Ans. is a a2 presynaptic blocker Reference KDT 5th p. 121 4the page 135Prazosin is a highly selective a1 blakerIt producers first dose effect Postural hypotension in the beginningIt is highly bound to proteins, metabolized in liver and primarily excreted in bile.It dilates arterioles more than veins. 