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Table 1 Common medications and chemicals known to cause methemoglobinemia [7].

From: Benzocaine and lidocaine induced methemoglobinemia after bronchoscopy: a case report

Acetaminophen Hydroxylamine Nitrosobenzene
Acetanilide Local anesthetics Phenacetin
Aminophenols    Benzocaine Phenols
Ammonium nitrate    Cocaine Phenytoin
Amyl nitrite    Lidocaine Primaquine
Aniline    Prilocaine Pyridine
Celecoxib    Procaine Pyridium
Chloroquine Menthol Quinones
Cobalt Methylene blue Resorcinol
Chlorates Nitrates/Nitrites Silver nitrate
Copper sulfate Nitrofuran Sodium nitrite
Dapsone Nitrogen oxide Sulfonamides
EMLA Nitroglycerin Trinitrotoluene
Herbicides Nitroprusside