<prompt> Short acting non deipolarizing blocker -RocuroriumSuxamethoniumMivacuriumPancuronium  <response>: Ans. is c i.e., Mivacurium SKELETAL MUSCLE RELAXANTSo Skeletal muscle relaxants are drugs that act peripherally at neuromuscular junctionmuscle fibre itself or centrally in the cerebrospinal axis to reduce muscle tone.o The neuromuscular blocking agents are used primarily in conjuction with general anaesthetics to provide muscle relaxation for surgery, while centrally acting muscle relaxants are used mainly for painful muscle spasms and spastic neurological conditions.Muscle relaxantsPeripherally actingCentrally acting o Mephenesin congenersNeuromuscular blocking agentsDirectly acting agents Chlorzoxazone o Dantrolene sodiumChlormezanoneNondepolarizing competitive blockersDepolarizing blockers DiazepamaLong acting - d. tubocurarine, Pancuronium,o SuccinyIcholineo GABA derivativesDoxacurium, Pipecuroniumo Decamethonium Baclofenb Intermediate - Vecuronium, Atracurium o Central a2 - agonistactingcisatracurium, Rocuronium, Rapacuronium Tizanidinec Short acting - MivacuriumCompetitive nondepolarizing blockers are of two types1. Benzytisoquinolone derivativeso This includes -d-TC, doxacurium, atracurium, cisatracurium, mivacurium, metocurine.o These drugs have tendency to release histamine and to block autonomic ganglion.2. Amminio steroid derivativeso This include pancuronium, rocuronium, vecuronium, pipecuronium, rapacuronium.These drugs do not block autonomic ganglia and have minimal histamine releasing property. 