When a local anesthetic is to be administered by infiltration, which of the following may be added to decrease its dosage and prolong its duration of action?
A. Lidocaine
B. Norepinephrine
C. Epinephrine
D. Bupivacaine
c
Rationale: When a local anesthetic is to be administered by infiltration, epinephrine may be added to it to decrease its dosage and prolong its duration of action. However, epinephrine should not be used to anesthetize fingers, toes, and other tissues with end arteries.
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