Bupivacaine hydrochloride is a medication used as a local anesthetic. It belongs to a class of drugs called amide local anesthetics.

Bupivacaine hydrochloride works by blocking the transmission of nerve impulses in the area where it is injected, leading to temporary loss of sensation and pain relief. It does this by inhibiting the flow of sodium ions into nerve cells, which prevents the generation and propagation of action potentials.