Methanol poisoning is an emergency. After a suspected ingestion or significant inhalation, or after methanol contacts the eyes or skin, contact a poison center or emergency service immediately—even if the person feels normal. In the United States, Poison Help is available at 1-800-222-1222. Call 911 for collapse, a seizure, breathing trouble, shock, or a person who cannot be awakened. Do not wait for blurred vision or other late symptoms.
Why methanol poisoning can look mild at first
Methanol, also called methyl alcohol or wood alcohol, is used in some industrial solvents and fuels and can contaminate alcohol products. The danger is not limited to the liquid itself. After absorption, the body converts methanol into toxic metabolites, including formate and formic acid. These substances can cause severe metabolic acidosis and injure the optic nerves, brain and other organs.
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There may be a symptom-free or deceptively mild interval. The National Institute for Occupational Safety and Health (CDC/NIOSH) reports that adverse effects can begin 1 to 72 hours after exposure (2011). The delay varies with the amount, route and whether another alcohol was also consumed. Apparent sobriety, a normal conversation or the absence of eye symptoms does not make an exposure safe.
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NIOSH’s emergency guidance states: Do not induce vomiting (emesis).
Its poison-emergency instruction is: In the event of a poison emergency, call the poison center immediately at 1-800-222-1222.
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First signs and later symptoms
Early symptoms
Initial complaints can resemble ordinary intoxication, a stomach illness or fatigue. Possible early signs include headache, dizziness, drowsiness, confusion, nausea, vomiting and loss of coordination. A person may appear only mildly affected during the first several hours, then deteriorate as toxic metabolites accumulate.
Vision changes are a warning, not a symptom to watch at home
Methanol can damage the optic nerves. Blurred, dim or distorted vision, light sensitivity, seeing a “snowfield” or snow-like effect, and partial or complete blindness require emergency assessment. A sudden visual change after a symptom-free period is especially concerning, but waiting for any visual change is unsafe because serious acidosis or brain injury may already be developing.
Signs of severe poisoning
Progressive toxicity may cause abdominal pain, rapid or difficult breathing, hallucinations, seizures, coma, low blood pressure and respiratory arrest. The fast or deep breathing can be the body’s response to severe acidosis rather than simple anxiety. Survivors can be left with permanent optic-nerve injury and blindness, parkinsonism, encephalopathy or peripheral neuropathy; methanol poisoning can also be fatal.
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What to do before professional help arrives
Use the route-specific steps below while contacting a poison center or emergency service. Do not delay the call while trying to identify an exact amount or find a home treatment.
If the substance was swallowed
- Move the person away from the container or contaminated area and keep the airway clear.
- Call the poison center immediately. Give the product name if known, the estimated amount, the time of exposure, the person’s age and current symptoms.
- Do not induce vomiting. Do not give activated charcoal, alcohol, food, milk or another home remedy unless a poison specialist or clinician specifically directs it.
- If the person is unconscious, seizing, breathing abnormally or unable to protect the airway, call emergency services and follow the dispatcher’s instructions. Do not give anything by mouth.
- If it is safe, take the original container or label to the emergency department. Never postpone the call or transport to collect packaging.
If methanol reached the eyes
- Remove the person from the source.
- Rinse the eyes with large amounts of tepid water for at least 15 minutes. Keep the eyelids open and remove contact lenses if they come out easily during rinsing.
- Obtain immediate medical care after irrigation, even if discomfort or vision seems to improve.
If it soaked the skin
- Remove contaminated clothing, shoes and jewelry.
- Wash the affected skin thoroughly with soap and water.
- Seek medical advice promptly, particularly after a large spill, prolonged contact or symptoms such as dizziness, headache or nausea. Bag contaminated clothing so others do not handle it.
If fumes were inhaled
- Move to fresh air only if you can do so without entering an unsafe atmosphere. Avoid exposing rescuers to vapors.
- Check responsiveness, breathing and pulse. Call emergency services for breathing difficulty, collapse or worsening drowsiness.
- Provide rescue breathing only if trained and using a barrier device or bag-valve mask. Do not perform unprotected mouth-to-mouth ventilation in a contaminated environment.
- Get immediate medical evaluation; inhalation can produce systemic poisoning even when the skin is unaffected.
When every suspected exposure needs urgent evaluation
Call without waiting for symptoms after any suspected ingestion or meaningful inhalation, eye exposure or skin exposure. Treat the following situations as particularly urgent:
- Any blurred, dim, “snowfield” or otherwise abnormal vision.
- Repeated vomiting, severe abdominal pain, confusion, unusual sleepiness or poor coordination.
- Fast, deep or difficult breathing, a seizure, collapse, inability to wake, very low blood pressure or signs of shock.
- An exposure involving a child, an unknown product, intentional self-harm, contaminated alcohol or a contaminated hand sanitizer.
- A person who seems to improve and then worsens, especially after a symptom-free interval.
Do not use the absence of early symptoms, a normal-looking pupil response or apparent sobriety to decide that medical care is unnecessary. Poison specialists can determine whether observation, ambulance transport or an emergency-department assessment is needed.
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What happens in the hospital
Assessment and testing
Clinicians first assess airway, breathing and circulation and treat immediate instability. They may measure blood gases, electrolytes, the anion gap and the osmolal gap, along with a methanol level when available. The timing of exposure matters because a level or gap can change as methanol is metabolized. A normal early result does not automatically exclude evolving toxicity, so clinicians interpret tests with the examination and exposure history.
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The preferred antidote is fomepizole, which blocks the enzyme that converts methanol into its more dangerous metabolites. In some circumstances, clinicians use carefully controlled intravenous ethanol for the same purpose. These drugs require medical monitoring of blood levels, glucose, electrolytes and neurologic status; drinking alcohol at home is not a substitute and can create additional poisoning risks.
Severe acidosis is corrected with hospital-directed therapy. Folinic acid may be given to support metabolism of toxic formate. Oxygen, fluids, seizure treatment, airway support and other supportive measures are selected according to the patient’s condition.
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Hemodialysis
Hemodialysis rapidly removes methanol and its toxic metabolites and helps correct acid-base abnormalities. It is considered when there is severe metabolic acidosis, visual toxicity, a high methanol concentration or other serious clinical findings. The decision depends on laboratory results, symptoms and the response to antidote therapy; it is not a procedure that can be arranged or performed safely at home.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Methanol poisoning versus ordinary ethanol intoxication
Both substances are alcohols, but their clinical patterns and treatment needs differ. The comparison below is a reason to seek expert assessment, not a way to diagnose the liquid by appearance or by how the person initially behaves.
| Feature | Methanol exposure | Typical ethanol intoxication |
|---|---|---|
| Timing | Symptoms may be delayed for 1–72 hours, according to CDC/NIOSH (2011); a quiet interval can precede deterioration. | Effects generally track the period of drinking and the blood-alcohol rise and fall; apparent early improvement does not identify the substance. |
| Vision | Blurred, dim or “snowfield” vision and blindness are characteristic danger signs of optic-nerve injury. | Visual impairment from ordinary intoxication is not the same pattern as methanol optic toxicity; new or worsening vision changes need emergency assessment. |
| Acid-base risk | Formate/formic acid can produce severe metabolic acidosis with rapid or difficult breathing. | Do not assume an alcohol-related illness is uncomplicated intoxication; clinicians evaluate breathing, circulation and laboratory abnormalities. |
| Specific treatment | May require fomepizole or controlled intravenous ethanol, correction of acidosis, folinic acid and hemodialysis. | Management depends on the clinical picture; methanol-directed antidotes and dialysis are not home treatments for suspected drinking. |
| Urgency | Any suspected exposure warrants immediate poison-center or emergency guidance, even before symptoms. | When the product is uncertain, treat the event as a possible toxic-alcohol exposure until professionals identify the risk. |
Information to give the poison center or emergency department
Keep the caller focused on actionable facts rather than trying to calculate a dose. Report the product name and concentration if printed, whether it was swallowed, inhaled or spilled, the approximate time, the estimated amount, the person’s age and weight if known, and every symptom. Mention other alcohol or drugs that may have been taken and whether the exposure was intentional. Bring the container or a photograph of its label when safe, but never delay emergency care to retrieve it.
Preventing a second exposure
After the immediate emergency, keep solvents, fuels and other toxic liquids in their original labeled containers with intact caps. Never transfer them to beverage bottles, cups or unlabeled jars. Store them away from children and from food and drink, and follow workplace ventilation and protective-equipment rules. Dispose of contaminated liquids through the appropriate local hazardous-waste service rather than pouring them into drains or leaving them accessible.
If a spill has occurred indoors, leave the area and contact trained responders when ventilation cannot be done safely. Do not re-enter to clean up while experiencing dizziness, headache, nausea or breathing irritation.
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