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Hexylcaine

Hexylcaine hydrochloride, also called cyclaine ( Merck) or osmocaine, is a short-acting local anesthetic. It acts by inhibiting sodium channel conduction. Overdose can lead to headache, tinnitus, numbness and tingling around the mouth and tongue, convulsions, inability to breathe, and decreased heart function.

Wiktionary

hexylcaine

n. A particular kind of short-acting local anesthetic.