HBG2 and methemoglobinemia: It is used as a preservative, color fixative, and antimicrobial agent, mainly in cheese, meat (such as ham, bacon, and sausages), and fish.[1,2] Another use is as an industrial chemical and therapeutic antidote agent for cyanide intoxication.[3] The primary toxicity mechanism of sodium nitrite is the oxidation of ferrous iron (Fe2+) of hemoglobin to methemoglobin (MetHb) containing ferric iron (Fe3+) with consequent methemoglobinemia, in which it loses its ability to bind and transport oxygen.[4]