<prompt> Reason for preferring cis-Atracurium over Atracurium is:-Faster acting than AtracuriumLesser provocation of histamine releaseShoer action than atracuriumDoes not undergo Hoffman elimination  <response>: Cis-atracurium and Atracurium both are NMJ blocking agent. Cis atracurium has same pharmacokinetic propeies as atracurium. Atracurium release histamine and is metabolized to Laudonasine, which can provoke seizures. Both undergo Hoffman elimination. 