Introduction: Methemoglobinemia is a rare clinical disorder characterized by increase in the blood level of methemoglobin (MetHb) which leads to tissue hypoxia. Methemoglobinemia may be congenital, but acquired type is more common and occurs after exposure to oxidizing agents. Treatment of choice is methylene blue (MB). The side effects of MB restrict its usage in special conditions. Ascorbic acid is a good alternative drug with limited experience in methemoglobinemia. Case Report: Eight years old male patient presented with cyanosis after dapsone exposure and diagnosis of methemoglobinemia was confirmed. The patient was managed successfully with ascorbic acid. Conclusion: Ascorbic acid could be used as an alternative treatment for methemoglobinemia when methylene blue is not available or contraindicated.