The maximum dose to be employed as a single injection should be determined on the basis of the status of the patient and the type of regional anesthetic technique to be performed. Although single injections of 450 mg have been employed for regional anesthesia without adverse effects, at present it is strongly recommended that the maximal dose as a single injection should not exceed 400 mg (approximately 8.0 mg/kg or 3.6 mg/lb based on a 50 kg person) with epinephrine 1:200,000 and 300 mg (approximately 6 mg/kg or 2.7 mg/lb based on a 50 kg person) without epinephrine.

Rat brain type IIA Na+ channels expressed in Xenopus oocytes were stimulated infrequently (1 pulse per 20 s, all currents were elicited by 15-ms pulses to 0 mV.) This tonic block mainly reflects drug binding to resting channels, the channel state that predominated at the holding potential of -90 mV. Etidocaine (200 mkM) decrease activities of WT Type IIA Na+ channels on ~40%.