Used primarily in scientific research to block voltage-gated potassium channels in excitable cells, enabling the study of ion channel function and neuronal signaling. Commonly applied in electrophysiology experiments to prolong action potentials and enhance neurotransmitter release. Also employed in studies involving smooth muscle contraction and cardiac physiology due to its ability to modulate membrane excitability. Serves as a reference compound in analytical chemistry for testing quaternary ammonium detection methods.