What Is a Meths Drinker? The Dangers of Methylated Spirits

A “meths drinker” is a person who consumes methylated spirits, a form of denatured alcohol sold as an industrial solvent and cleaning agent, as a substitute for conventional alcoholic drinks. The term is most commonly heard in the United Kingdom and Australia, where methylated spirits (often just called “meths”) has historically been cheap and widely available in hardware stores and pharmacies. Because the product is designed specifically to be undrinkable, consuming it exposes a person to methanol and other toxic additives that can cause blindness, organ failure, and death. The practice is almost always tied to severe alcohol dependence and reflects a lack of access to safer alternatives rather than a deliberate choice.

What Methylated Spirits Actually Contains

Methylated spirits is ethanol, the same type of alcohol found in beer and wine, that has been intentionally contaminated so it cannot legally be sold as a beverage. Governments require this denaturing process so that manufacturers and consumers can buy industrial ethanol without paying the heavy excise taxes applied to drinking alcohol. The specific additives vary by country and by product, but the most common denaturant is methanol, typically making up around five to ten percent of the liquid. Some formulations also include acetone, isopropanol, or pyridine, a foul-smelling chemical that causes liver injury and neurological symptoms with repeated exposure.

A Swedish denatured alcohol product studied in a toxicology investigation illustrates a typical formula: it contained about 92 percent ethanol by weight, with 2 percent acetone and 5 percent 2-butanone, along with a red dye and a bittering agent called bitrex meant to deter anyone from drinking it.¹ The bittering agents and dyes are meant as deterrents, but they do not make the product any less toxic. A person who powers through the awful taste still absorbs all the methanol and industrial solvents the formula contains.

Why People Drink It

Nobody drinks methylated spirits because they enjoy the experience. The practice is driven by severe, long-term alcohol dependence in people who have run out of money, lost access to conventional alcohol, or face other barriers like homelessness and social isolation. In some settings, a bottle of methylated spirits costs a fraction of what a bottle of wine or spirits does, and it is available at shops that do not check identification or restrict hours of sale the way a liquor store might.

This falls under what public health researchers call “unrecorded alcohol,” a broad category that includes homemade brews, bootleg liquor, and surrogate alcohols like methylated spirits, mouthwash, and hand sanitizer. Globally, unrecorded alcohol accounts for roughly a quarter of all alcohol consumed.² The proportion is highest in regions where taxes on beverage alcohol are very high or where alcohol is partially or fully prohibited. In a survey across several former Soviet states, over a third of people who had drunk alcohol in the previous week reported consuming unrecorded alcohol, most commonly homemade spirits.³ In Thailand, unrecorded alcohol made up a smaller share of total consumption, but people who engaged in heavy episodic drinking consumed the most of it.⁴

Meths drinking tends to occur among people who are already at the extreme end of alcohol dependence, often with co-occurring mental health conditions and unstable housing. It is not a casual behavior, and the people who engage in it are typically well aware of the risks. Their dependence has simply reached a point where avoiding withdrawal feels more urgent than avoiding poisoning.

How Methanol Damages the Body

The ethanol in methylated spirits is processed the same way as the ethanol in a glass of wine. The danger comes from the methanol. Methanol itself is only mildly toxic, but once it reaches the liver, enzymes convert it first into formaldehyde and then into formic acid (formate).⁵ Formic acid is the real killer. It accumulates in the blood, causes a dangerous drop in blood pH known as metabolic acidosis, and directly poisons cells by shutting down the process those cells use to produce energy.

Formic acid has a particular affinity for the optic nerve and certain deep brain structures. It binds to a key enzyme in the cellular energy chain, blocking the ability of cells to use oxygen.⁶ The cells that are most vulnerable are those with the highest energy demands, which is why vision loss and brain damage are the signature injuries of methanol poisoning rather than, say, muscle damage. Other toxic alcohols like isopropanol and ethylene glycol also cause harm through their metabolites rather than the parent compound, but methanol’s metabolite is uniquely destructive to the nervous system.⁷

An ironic twist: ethanol actually slows down methanol’s conversion to formic acid, because both compete for the same liver enzyme. This means that when someone drinks methylated spirits, the large amount of ethanol in the product temporarily delays the worst of the methanol poisoning. The person may feel drunk but otherwise functional for hours, only to deteriorate severely once the ethanol wears off and the liver turns its full attention to the methanol. This delay is medically significant and also helps explain why meths drinkers sometimes survive individual episodes. It is also why ethanol itself was historically used as a treatment for methanol poisoning.

What Methanol Poisoning Looks and Feels Like

The early symptoms of methanol poisoning mimic a bad hangover or stomach flu: nausea, vomiting, and headache. In a retrospective study of methanol poisoning cases in Saudi Arabia, nausea or vomiting was the most common complaint among patients who arrived at the emergency department alive, followed by an altered level of consciousness.⁸ What distinguishes methanol poisoning from a simple hangover is the progression. Over six to thirty hours, as formic acid builds up, symptoms escalate to rapid breathing (the body’s attempt to compensate for the acid in the blood), confusion, falling blood pressure, and eventually coma.

In that same Saudi study, about 40 percent of patients were breathing abnormally fast, and roughly a third had elevated heart rates. Among the patients assessed by an eye specialist, over half had some degree of vision impairment.⁸ Loss of consciousness was the dominant complaint among the most severely poisoned patients, reflecting widespread disruption of brain function.

Blindness and Brain Damage

Vision loss is the most feared consequence of methanol poisoning, and it is not a historical curiosity. The optic nerve, which transmits visual information from the eye to the brain, is extremely sensitive to formic acid’s energy-blocking effects. Damage can range from blurred vision to complete, permanent bilateral blindness. Research on the mechanisms describes a cascade of injury: in addition to blocking cellular energy production, formic acid triggers oxidative stress and inflammation that compounds the damage to nerve tissue.⁶

The brain is the other major target. A case report described a young woman who arrived in a coma with severe metabolic acidosis after drinking methanol. Brain imaging revealed destruction of the putamen, a structure deep in the brain involved in movement control, on both sides. She survived but was left permanently blind.⁹ This pattern of bilateral putaminal necrosis is considered a hallmark of methanol poisoning on brain scans and can produce lasting movement problems that resemble certain features of Parkinson’s disease.

For a one-time meths drinker, whether any of these outcomes occur depends on the dose of methanol, how quickly they receive treatment, and individual variation in how fast their body converts methanol to formic acid. For a chronic meths drinker, the picture is bleaker: repeated exposures cause accumulating damage even when no single episode is dramatic enough to send them to a hospital.

Emergency Treatment

If someone arrives at a hospital with suspected methanol poisoning, the immediate priority is stopping the liver from converting any remaining methanol into formic acid. The modern standard of care is fomepizole, a drug that blocks the liver enzyme responsible for that conversion. In a clinical trial published in the New England Journal of Medicine, fomepizole resolved metabolic abnormalities in all treated patients, and among seven patients who initially had visual problems, none of the survivors had detectable visual deficits by the end of the study.¹⁰ The key word there is “initially.” Once formic acid has already destroyed optic nerve tissue, no antidote can reverse that. Fomepizole works by preventing further damage, not by repairing what is already done.

When given early, before significant acidosis or organ injury has set in, fomepizole can prevent the need for hemodialysis.¹¹ Hemodialysis directly filters methanol and formic acid out of the blood and is used in severe cases where the patient is already deeply acidotic, in a coma, or has very high methanol levels. Before fomepizole became available, the standard treatment was intravenous ethanol, which works on the same principle of competing for the liver enzyme. Ethanol is cheaper but harder to dose precisely and causes its own complications, including sedation and erratic blood sugar levels. Many hospitals in lower-resource settings still rely on ethanol as the antidote because fomepizole is expensive.

Risks Beyond Drinking

Meths drinkers face the worst outcomes, but methanol can enter the body through other routes too. A case report documented a patient who developed vision loss and severe metabolic acidosis from chronic exposure to methanol vapors and skin contact, without ever drinking the substance. The clinical course was essentially identical to oral poisoning.¹² The authors stressed that clinicians need a high index of suspicion for methanol toxicity whenever a patient presents with unexplained vision loss and a large gap in blood acid levels, even if there is no reported history of drinking a toxic substance.

This matters for people who use methylated spirits as a household cleaner or solvent in poorly ventilated spaces. A single afternoon of wiping down surfaces probably poses minimal risk, but habitual use in enclosed rooms could, over time, lead to meaningful absorption through the lungs and skin. People who work with large quantities of industrial solvents containing methanol face an occupational version of the same hazard.

When Meths Drinkers Also Smoke

Many people with severe alcohol dependence are also heavy smokers, and the combination is worse than either habit alone. An animal study examining long-term exposure to both methylated spirits and nicotine found that the combination increased urinary sodium loss and markers of kidney stress, suggesting a heightened risk of renal failure from fluid and electrolyte disturbances.¹³ While animal studies do not translate directly to humans, the finding aligns with clinical experience: meths drinkers who smoke tend to deteriorate faster across multiple organ systems. The kidneys, already burdened with clearing methanol and its metabolites, face additional stress from nicotine’s effects on blood pressure and blood flow.

Managed Alcohol Programs

The most promising harm-reduction strategy for chronic meths drinkers involves giving them supervised access to beverage-grade alcohol. This sounds counterintuitive, but the logic is straightforward: if someone is going to drink regardless, providing them with wine or beer in a controlled setting eliminates the methanol, acetone, and other industrial toxins that make surrogate alcohol so dangerous.

Canada has been at the forefront of this approach with managed alcohol programs, or MAPs. In a pilot evaluation, participants in a MAP had 41 percent fewer police contacts, 87 percent fewer detox admissions, and 32 percent fewer hospital admissions compared to their own pre-program periods. Their use of non-beverage alcohol, the category that includes methylated spirits and mouthwash, dropped significantly.¹⁴ Liver function test scores also improved after participants entered the program, a sign that their livers were recovering once the industrial toxins were removed from the picture.

A larger comparison across six Canadian MAPs confirmed the pattern. Long-term MAP residents drank on more days per month than matched controls, but they consumed about seven fewer standard drinks per drinking day and reported significantly fewer alcohol-related harms across health, legal, safety, and social domains.¹⁵ The programs are not a path to sobriety for most participants. They are a way to keep people alive and reduce the catastrophic injuries associated with surrogate alcohol, while also reducing the burden on emergency rooms and police. For chronic meths drinkers who have not responded to conventional addiction treatment, this approach treats the most lethal part of the problem first.

Policy and the Limits of Denaturing

Governments face a genuine dilemma with denatured alcohol. The whole point of adding methanol and other chemicals to industrial ethanol is to prevent people from drinking it, thereby justifying the tax exemption that keeps it affordable for legitimate uses like cleaning and fuel. But the people most likely to drink it are precisely those for whom the bittering agents and foul smells are not enough of a deterrent. A person in acute alcohol withdrawal is not weighing taste against health risk in any rational way.

Researchers who study unrecorded alcohol have recommended several policy approaches: restricting access to methanol itself, increasing taxation on products that can serve as surrogates, and developing denaturing additives that are more effective at deterring consumption but less toxic if someone drinks the product anyway.² Some countries have experimented with replacing methanol with less dangerous denaturants, reasoning that if the deterrent effect is similar but the health consequences of failure are less severe, fewer people will die. Others have restricted sales of methylated spirits to licensed premises or limited bottle sizes. None of these measures eliminates the problem entirely, because the underlying driver is alcohol dependence severe enough to override every rational consideration, and that requires treatment rather than product regulation.

In parts of the world where alcohol is prohibited or very expensive, surrogate alcohol consumption tends to be highest, and the methanol poisoning outbreaks that periodically make international news often reflect these conditions. The Saudi study mentioned earlier involved an outbreak, not isolated cases, underscoring how surrogate alcohol use can cluster in specific communities or circumstances.⁸ Monitoring systems that track emergency department presentations and unusual patterns of blindness or acidosis can help public health authorities detect and respond to these clusters before the death toll climbs.