Two cases of acute methanol poisoning partially treated by oral 4-methylpyrazole.

Abstract

Since the use of 4-methylpyrazole (4-MP) in the treatment of humans with methanol poisoning is poorly documented, we report two cases of acute methanol intoxication partially treated by this potent alcohol dehydrogenase (ADH) inhibitor. Intensive Care Unit in a university hospital. A 56-year-old man and an 18-year-old woman were observed, respectively, 41 and 16 h after the voluntary ingestion of an unknown amount of methanol. In both cases, ethanol was used as the first antidote. In the first patient, hemodialysis was also performed on admission because a high methanol level (0.72 g/l) and visual impairment were noted. In the second patient, ethanol therapy was withdrawn after 12 h when clinical and biological signs of acute pancreatitis became evident. Both patients received multiple oral doses of 4-MP. No recurrence of metabolic acidosis occurred and the 4-MP therapy was well tolerated. While the use of 4-MP is better documented in cases of ethylene glycol poisoning, it could also become an accepted option for the management of methanol poisoning since 4-MP offers advantages over ethanol therapy.