Methemoglobinemia can be treated by:
Hepatic metabolism of prilocaine generates O-toluidine, which oxidizes hemoglobin to methemoglobin. Methemoglobinemia, if severe, may be treated by the intravenous administration of methylene blue Ref: Miller's anesthesia-7th ed, Chapter 30.
Methylene blue
Vitamin K
Vitamin A
All of the above