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Benzocaine, a local anesthetic, acts by blocking the voltage-gated sodium channels in nerve membranes. This prevents the transmission of pain signals along the nerve fibers.
Reference:
Li, J., & Fettiplace, R. (2004). Molecular mechanism of action of local anesthetics. Journal of Physiology, 559(2), 359-374. doi: 10.1113/jphysiol.2004.068238