Wood alcohol poisoning occurs when someone drinks methanol, a toxic alcohol that looks and smells like ethanol. Even small amounts can cause severe metabolic acidosis, organ damage, and death if medical care is delayed.
This article explains how methanol poisoning happens, how to recognize it, and what steps reduce risk from accidental or intentional ingestion.
| Aspect | Methanol (Wood Alcohol) | Ethanol (Beverage Alcohol) | Key Danger Level |
|---|---|---|---|
| Chemical Structure | CH3OH | C2H5OH | Methanol differs by one carbon |
| Common Sources | Industrial solvents, fuel, counterfeit liquor, illicit drugs | Fermented beverages, cooking extracts, some medicines | Unregulated or counterfeit products increase risk |
| Metabolism & Toxicity | Converted to formaldehyde then formic acid, causing acidosis and optic nerve damage | Metabolized by alcohol dehydrogenase with less direct cellular toxicity | Acidosis and blindness can occur at low doses |
| Typical Toxic Dose | As little as 10–30 mL can cause serious poisoning; 100 mL or more is often fatal | Lethal dose varies widely by tolerance, body weight, and co-ingestants | Small volumes of methanol require urgent treatment |
Recognizing Signs And Symptoms
Initial Effects
Early symptoms resemble drunkenness but can quickly worsen, including dizziness, nausea, vomiting, headache, and blurred vision.
Progressive Complications
As formic acid builds up, metabolic acidosis leads to breathing difficulty, extreme fatigue, low blood pressure, seizures, and potential blindness or coma.
Mechanisms Of Poisoning
Metabolic Pathway
Methanol itself is relatively low-toxic, but liver enzymes convert it to formaldehyde and then to formic acid, which disrupts cellular respiration and damages the optic nerve.
Contributing Factors
Small amounts of methanol can be dangerous because the toxic metabolites accumulate faster than the body can clear them, especially without treatment.
Medical Diagnosis And Treatment
Diagnostic Steps
Clinicians check blood methanol and formate levels, arterial blood gases for acidosis, electrolyte panels, and ocular exams to assess optic nerve function.
Standard Interventions
Treatment includes ethanol or fomepizole to block methanol metabolism, aggressive intravenous bicarbonate to correct acidosis, dialysis for severe cases, and supportive care for vision and breathing.
Prevention And Safety Measures
- Never consume products labeled as non-beverage alcohol, industrial solvents, or unknown liquid sources.
- Use only regulated, properly labeled alcoholic beverages and avoid illicit or counterfeit liquor.
- Ensure workplace safety with appropriate ventilation, protective equipment, and clear hazard labeling around methanol sources.
- Store chemicals and fuels securely out of reach of children and away from food or drink containers to prevent accidental ingestion.
FAQ
Reader questions
Can even a small taste of a methanol-contaminated drink cause serious harm?
Yes, methanol is highly toxic; even small amounts can lead to metabolic acidosis and vision loss without immediate treatment.
How quickly do symptoms appear after swallowing wood alcohol?
Symptoms often begin within hours but may be delayed, and deterioration can be rapid once formic acid accumulates.
What should I do if I suspect methanol poisoning in myself or someone else?
Seek emergency medical care immediately, avoid further ingestion, and bring any suspected product container for identification.
Is home treatment or waiting to see if symptoms improve safe with wood alcohol exposure?
No, methanol poisoning is a medical emergency requiring professional care; delaying treatment increases the risk of permanent blindness or death.