If you accidentally swallowed isopropyl alcohol (rubbing alcohol), call Poison Control at 1-800-222-1222 right away. A small, accidental sip is unlikely to cause serious harm in a healthy adult, but isopropyl alcohol is roughly twice as potent as drinking alcohol when it comes to suppressing your nervous system, and its effects last two to four times longer. Even a modest amount can make you feel very drunk, very fast.
What you do in the next few minutes matters. Here’s what to know.
Immediate Steps to Take
Do not induce vomiting. Isopropyl alcohol can irritate and burn the lining of your throat and stomach, and vomiting brings it back up through those same tissues a second time. It can also be inhaled into the lungs on the way back up, which creates a separate and dangerous problem.
If you’re alert and able to swallow normally, take small sips of water. This helps dilute the alcohol in your stomach. Do not eat or drink anything if you feel too drowsy, are vomiting, or have trouble swallowing safely.
Call Poison Control (1-800-222-1222) even if you feel fine. The specialists there will walk you through exactly what to do based on how much you swallowed, your body weight, and your symptoms. They handle these calls constantly and can tell you whether you need to go to the emergency room or can safely monitor yourself at home. Have the product container nearby so you can read them the label.
How Much Is Dangerous
The potentially lethal dose of isopropyl alcohol is estimated at 2 to 4 milliliters per kilogram of body weight. For a 150-pound adult, that works out to roughly 140 to 270 mL, or about half a cup to just over a cup. That sounds like a lot, but keep in mind that most rubbing alcohol is 70% concentration, and the margin narrows for children, smaller adults, or anyone with liver problems.
A single accidental mouthful, like mistaking a water bottle for one containing rubbing alcohol, typically falls well below this range. But “accidental” covers a wide spectrum, and your body weight, age, and whether you’ve eaten recently all affect how quickly the alcohol hits your system. This is why calling Poison Control matters regardless of the amount.
Symptoms to Watch For
Isopropyl alcohol is absorbed quickly through the stomach lining. Symptoms can appear within 30 minutes to two hours and tend to follow a recognizable pattern. Early signs resemble being drunk: slurred speech, dizziness, headache, and uncoordinated movement. You may also notice abdominal pain, nausea, or vomiting.
More concerning symptoms signal that a larger amount has been absorbed:
- Rapid heart rate with low blood pressure
- Slowed breathing
- Low body temperature
- Vomiting that contains blood
- Confusion or stupor progressing toward unresponsiveness
- Low blood sugar, which can cause shakiness, sweating, and further confusion
If the person who swallowed isopropyl alcohol becomes drowsy, unresponsive, or has trouble breathing, call 911 immediately. Do not wait for symptoms to get worse.
Why Isopropyl Alcohol Hits Harder Than Drinking Alcohol
Your body processes isopropyl alcohol using the same enzyme it uses for beer, wine, and liquor. But instead of breaking it down into the compounds that regular alcohol produces, it converts isopropyl alcohol into acetone, the same chemical found in nail polish remover. Acetone circulates through your blood and is eventually cleared through your lungs (giving your breath a distinctive fruity smell) and kidneys.
Because isopropyl alcohol is about twice as potent as ethanol at depressing your central nervous system, a volume that would make you mildly buzzed from vodka can make you dangerously sedated from rubbing alcohol. The sedation also lasts significantly longer. This extended duration is what makes even moderate ingestion risky: the deepest effects may not hit for an hour or more, and by then you may be too impaired to help yourself.
One piece of relatively good news: unlike methanol (found in some industrial solvents), isopropyl alcohol does not cause blindness, and unlike antifreeze, it does not typically cause kidney failure. The primary danger is severe sedation leading to breathing problems, along with irritation and possible bleeding in the stomach lining.
What Happens at the Hospital
If you end up in the emergency room, the medical team will focus on supporting your body while it clears the alcohol naturally. There is no specific antidote for isopropyl alcohol poisoning. Treatment is largely supportive: IV fluids to maintain blood pressure and hydration, monitoring of your breathing and heart rate, and correction of low blood sugar if needed.
In severe cases where someone has ingested a very large amount and is critically ill, dialysis can be used to filter the isopropyl alcohol and acetone directly from the blood. Isopropyl alcohol’s chemical properties make it a good candidate for this kind of filtering. But dialysis is reserved for the most serious poisonings where the body can’t keep up on its own.
Most people who receive prompt medical attention for isopropyl alcohol ingestion recover fully. The body clears acetone relatively efficiently through the lungs and kidneys, and in cases involving small to moderate amounts, symptoms typically resolve within several hours to a day with supportive care.
Special Concerns for Children
Children are at much higher risk from isopropyl alcohol because the potentially dangerous dose scales with body weight. A volume that barely affects an adult could be serious for a toddler. Children are also more vulnerable to drops in blood sugar, which can happen with isopropyl alcohol ingestion and cause seizures on its own.
If a child has swallowed any amount of rubbing alcohol, call Poison Control immediately. Don’t try to estimate whether the amount was “enough to matter.” Keep all isopropyl alcohol products stored out of reach, especially brightly colored or scented hand sanitizers that children may mistake for drinks or candy.