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  • Title: Acute methemoglobinemia induced by topical benzocaine and lidocaine.
    Author: O'Donohue WJ, Moss LM, Angelillo VA.
    Journal: Arch Intern Med; 1980 Nov; 140(11):1508-9. PubMed ID: 7436648.
    Abstract:
    Acute methemoglobinemia may result from the use of several local anesthetic agents. Benzocaine (Cetacaine) spray has been shown previously to cause methemoglobinemia in two patients when applied topically to the mucous membranes. We describe a patient with respiratory failure following trauma who had two episodes of acute methemoglobinemia, one after the topical application of benzocaine and the second following lidocaine administration for endotracheal intubation. The episodes occurred more than 20 hours apart, and no other drugs known to induce methemoglobinemia were given. On both occasions, intravenous methylene blue was effective in correcting the disorder.
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