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(Science: chemical) a rapid-onset, short-acting cholinesterase inhibitor used in cardiac arrhythmias and in the diagnosis of myasthenia gravis. It has also been used as an antidote to curare principles.

Pharmacological action: anti-arrhythmia agents, antidotes, cholinesterase inhibitor, parasympathomimetic.

chemical name: Benzenaminium, N-ethyl-3-hydroxy-N,N-dimethyl-