Used primarily in scientific research as a neuromuscular blocking agent to study nerve-muscle transmission. Acts as a depolarizing agent at the neuromuscular junction, mimicking acetylcholine initially and then causing prolonged depolarization, which blocks further muscle contraction. Commonly used in laboratory settings to investigate the function of nicotinic acetylcholine receptors and the mechanisms of muscle paralysis. Not used clinically due to its long duration of action and potential toxicity.