It is necessary to prevent spontaneous muscular contraction and movement when performing surgical procedures. The introduction of muscle relaxants has revolutionized the practice of anesthesia. By the end of the 1950s, non-depolarizing, neuromuscular blocking drugs (NMBDs), d-tubocurarine, and gallamine were available. Although these two relaxants are no longer in use, several newer NMBDs have emerged with safer side effect profiles over the last 20 years. Non-depolarizing muscle relaxants comprise the majority of clinically relevant neuromuscular blockers. As their name indicates, they cause neuromuscular blockade without depolarizing the motor endplate.
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