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Methanol: Effects, Poisoning & Treatment

Methanol is a highly toxic alcohol that causes severe poisoning upon ingestion. Even small amounts can lead to permanent blindness or death.

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Things worth knowing about "Methanol"

Methanol is a highly toxic alcohol that causes severe poisoning upon ingestion. Even small amounts can lead to permanent blindness or death.

What is Methanol?

Methanol (chemical formula: CH₃OH), also known as methyl alcohol or wood alcohol, is the simplest form of alcohol. It is a colorless, highly flammable liquid with a slightly sweet odor closely resembling that of ethanol (drinking alcohol). Methanol is produced on a large industrial scale and is widely used as a solvent, fuel, and precursor for the synthesis of other chemicals. However, for the human body, methanol is highly toxic and potentially lethal.

Uses and Occurrence

Methanol has numerous industrial and chemical applications:

As a solvent in the chemical industry
As a fuel or fuel additive (e.g., for racing vehicles or fuel cells)
As a feedstock for the production of formaldehyde, acetic acid, and other organic compounds
In antifreeze agents and windshield washer fluids
As a denaturant for ethanol (denatured alcohol)

In some cases, methanol enters the body through adulterated alcoholic beverages, which can lead to severe poisoning outbreaks.

Toxicity and Mechanism of Action

Methanol itself is less toxic than its metabolic breakdown products. In the body, methanol is first converted by the enzyme alcohol dehydrogenase into formaldehyde, which is then further oxidized by aldehyde dehydrogenase into formic acid (formate). Formate is the primary toxic agent: it inhibits cytochrome c oxidase, a key enzyme in cellular respiration within the mitochondria. This leads to cellular oxygen deprivation (histotoxic hypoxia) and severe metabolic acidosis (acidification of the blood). The optic nerve and the central nervous system are particularly vulnerable.

The lethal dose in humans is approximately 1 ml per kilogram of body weight. As little as 10 ml can cause permanent blindness, while 30 ml or more can be fatal.

Symptoms of Methanol Poisoning

Symptoms of methanol poisoning often appear with a delay of 12 to 24 hours after ingestion, as the toxic metabolites must first accumulate:

Headache and dizziness
Nausea, vomiting, and abdominal pain
Visual disturbances up to complete blindness (optic neuropathy)
Altered consciousness, confusion, and seizures
Metabolic acidosis (increased acidity of the blood)
Respiratory failure and cardiovascular collapse in severe cases

Routes of Exposure

Methanol can enter the body through several pathways:

Ingestion: the most common route of poisoning, e.g., through confusion with drinking alcohol
Inhalation: breathing in methanol vapors in occupational settings
Dermal absorption: possible through prolonged skin contact with liquid methanol

Diagnosis

Diagnosis of methanol poisoning is based on:

Patient history (history of exposure)
Clinical symptoms, especially visual disturbances and altered consciousness
Laboratory findings: metabolic acidosis with an elevated anion gap, detection of methanol and formate in the blood
Calculation of the osmol gap in serum as an indicator of toxic alcohol ingestion

Treatment

Treatment of methanol poisoning must be initiated as early as possible:

Antidote therapy: administration of ethanol or the more specific antidote fomepizole (4-methylpyrazole), which inhibits alcohol dehydrogenase and thereby blocks the conversion of methanol into toxic metabolites
Hemodialysis: for rapid elimination of methanol and formate from the blood
Correction of metabolic acidosis with sodium bicarbonate
Folinic acid (leucovorin) to promote formate metabolism
General supportive measures (airway management, circulatory stabilization)

Prevention

The following measures are important to prevent methanol poisoning:

Clear labeling and safe storage of products containing methanol
Strict separation of methanol and ethanol in industrial environments
Use of personal protective equipment when handling methanol in the workplace
Public education about the risks of illegal or adulterated alcohol

References

World Health Organization (WHO): Methanol poisoning outbreaks. WHO Technical Report, 2022. Available at: https://www.who.int
Kruse JA: Methanol Poisoning. Intensive Care Medicine, 2012; 38(7):1081-1084. PubMed PMID: 22527180
Liesivuori J, Savolainen H: Methanol and formic acid toxicity: biochemical mechanisms. Pharmacology and Toxicology, 1991; 69(3):157-163.

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