Pharmaceutical compositions comprising an ester anesthetic and a cholinesterase inhibitor have been found to exhibit surprising and beneficial results in achieving a long-acting nerve block for example when administered to an interfascial plane or a peri-neural location in a subject. Such pharmaceutical compositions may also contain an amide anesthetic. Pharmaceutical compositions and methods of using such compositions as described herein provide a surprising and unexpected duration of pain control and a reduced need for the use of narcotics.
