<prompt> All of the following nondepolarising neuromuscular blocker causes histamine release except-AtracuriumMivacuriumd-tubocurareVecuronium  <response>: All benzylisoquinoline nondepolarising neuromuscular blocker causes histamine release. Aminosteroid group does not release histamine. NDNB divided in three group according to duration of action - Long- acting, intermediate - acting and sho- acting. Aminosteroid Long acting Pancuronium pipecuronium Benzylisoquinoline D-tubocurane, Doxacurium Intermediate acting Aminosteroid Vecuronium Rocuronium Benzylisoquinoline Atracurium Cisatracurium Sho acting Aminosteroid Rapacuronium Benzylisoquinoline Mivavcurium Benzylisoquinoline group causes histamine release so IV injection of these drugs can cause hypotension,tachycardia, Bronchospasm, Flushing. 