Figure 1. Typical local anesthetic. A: Ester type B: Amide type

From

A Possible New Concept in the Mechanism of Action of Local Anesthesia

Maha T. Al–Saffar, Tahani A. AL-Sandook, Mahmoud Y-Taha

American Journal of Medical and Biological Research. 2013, 1(4), 134-137 doi:10.12691/ajmbr-1-4-5