Which of the following medications is not classified as a non-depolarizing neuromuscular blocker?

Explanation

D-tubocurarine, gallamine triethiodide, and pancuronium bromide are all examples of non-depolarizing neuromuscular blocking agents. In contrast, succinylcholine is a depolarizing neuromuscular blocker, which acts by mimicking acetylcholine and causing persistent depolarization. Therefore, succinylcholine is the only drug listed that is not a non-depolarizing agent.