Atracurium (BW-33A) besylate is a potent, competitive and non-depolarizing neuromuscular blocking agent. Atracurium besylate also is an AChR receptor antagonist. Atracurium besylate induces bronchoconstriction and neuromuscular blockade. Atracurium besylate promotes astroglial differentiation[1][2][3][4][5].