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methanol

Alcohol · Toxicological Agent (poisoning)

AlcoholToxicological Agent (poisoning)
CDSCO approved
EXCRETION
not curated
INTERACTIONS
none in our sources
PREGNANCY
not curated

Mechanism

Methanol is metabolized by alcohol and aldehyde dehydrogenases to formaldehyde and formic acid. The rate of metabolism is slower than ethanol. The toxic effects are largely due to formic acid, which accumulates in the body due to its slow further metabolism and folate dependence.

Dosing

Adult
Blood level of >50 mg/dl methanol is associated with severe poisoning. Even 15 ml of methanol has caused blindness and 30 ml has caused death; fatal dose is regarded to be 75–100 ml.

Pharmacokinetics

Half-life
20–60 hours
Metabolism
Methanol is metabolized to formaldehyde and formic acid by alcohol and aldehyde dehydrogenases respectively. The rate is 1/7th that of ethanol. Metabolism follows zero order kinetics.

Side effects

Serious
  • Vomiting
  • headache
  • epigastric pain
  • uneasiness
  • drunkenness
  • disorientation
  • tachypnoea
  • dyspnoea
  • bradycardia
  • hypotension
  • delirium
  • seizures
  • coma
  • acidosis
  • retinal damage
  • blurring of vision
  • congestion of optic disc
  • blindness
  • death (due to respiratory failure)

Related guidelines

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Sources: KD Tripathi 7e·Verified: 2026-05-10 · House clinical team