Question

What is the most common cause of amide local anesthetic allergic reaction?

1) Epinephrine
2) Lidocaine
3) Methylparaben
4) Sodium bisulfite

Answer 1

Methylparaben is the most common cause of amide local anesthetic allergic reactions, not epinephrine, lidocaine, or sodium bisulfite.

Step-by-step explanation:

The most common cause of amide local anesthetic allergic reaction is methylparaben, which is used as a preservative in many anesthetic formulations. Epinephrine, while often added to local anesthetics to prolong their effect and reduce bleeding by constricting blood vessels, is not the cause. Instead, it is used to counteract anaphylactic reactions. Lidocaine is an amide local anesthetic itself, not a typical allergen. Sodium bisulfite may cause allergic reactions when used as a preservative in anesthetic solutions containing epinephrine, but again, it is not the most common cause of allergic reactions to amide local anesthetics.