What are the chances of getting methemoglobinemia from benzocaine?
Conclusions and relevance: The overall prevalence of methemoglobinemia is low at 0.035%; however, an increased risk was seen in hospitalized patients and with benzocaine-based anesthetics.
How does benzocaine cause methemoglobinemia mechanism?
Intravenous methylene blue is indicated for methemoglobin fractions over 30% and at lower fractions in patients with anemia or cardiovascular disease. The dose may be repeated if no clinical response is observed within 1 hour. A dose greater than 7 mg/kg of methylene blue by itself can cause methemoglobinemia.
Can adults get methemoglobinemia from Orajel?
Conclusion. Acquired methemoglobinemia is a toxic hemoglobinopathy commonly caused by prescribed medications or those administered in a hospital setting. Rarely, however, over-the counter, self-administered medications containing benzocaine can cause methemoglobinemia in otherwise healthy adults.
Which drug is responsible for methemoglobinemia?
Drugs that may cause Methemoglobinemia include nitrates derivatives (nitrates salt, nitroglycerin), nitrites derivatives (nitroprusside, amyl nitrite, nitric oxide), sulfonamides, dapsone, phenacetin, phenazopyridine, some local anesthetics such as prilocaine, topical anesthetics such as emla cream, benzocaine.
Who is at risk for methemoglobinemia?
Acquired methemoglobinemia is more frequent in premature infants and infants younger than 4 months, and the following factors may have a role in the higher incidence in this age group: Fetal hemoglobin may oxidize more easily than adult hemoglobin.
Is it OK to swallow Orajel?
Avoid getting this medication in your eyes. Avoid swallowing the gel, liquid, or ointment while applying it to your gums or the inside of your mouth.
How toxic is Benzocaine?
Benzocaine and other local anesthetics can cause methemoglobinemia, a serious condition in which the amount of oxygen carried through the blood is greatly reduced. This condition is life-threatening and can result in death. Gently rub or massage the child’s gums with one of your fingers.
How do you reverse methemoglobinemia?
Methylene Blue is the standard first-line antidote for methemoglobinemia. The drug acts as a cofactor for NADPH reductase and ultimately increases the rate of conversion of ferric methemoglobin to ferrous hemoglobin.
Will methemoglobinemia go away on its own?
The condition is benign. There is no effective treatment for people with a congenital form who develop an acquired form. This means that they should not take drugs such as benzocaine and lidocaine. People who acquire methemoglobinemia from medications can completely recover with proper treatment.
