What Are the Immediate Symptoms of a Tylenol Overdose?
Tylenol (acetaminophen) overdose often starts with nausea, vomiting, sweating, and abdominal pain within hours. Some people feel fine initially, delaying recognition. By 24-48 hours, signs worsen to jaundice, confusion, lethargy, and dark urine as liver damage sets in.[1][2]
How Does Tylenol Overdose Damage the Liver?
Acetaminophen is metabolized in the liver into a toxic byproduct, NAPQI. In overdose, glutathione stores deplete, letting NAPQI kill liver cells. A single dose over 4,000 mg in adults—or less with alcohol use or fasting—risks acute liver failure. Blood tests show elevated liver enzymes (AST/ALT) confirming damage.[1][3]
When Is It Life-Threatening and What Kills Patients?
Untreated, overdose causes fulminant hepatic failure in 1-3 days, with coma, bleeding, kidney failure, and death in up to 30% of severe cases. The median lethal dose is around 15-20 grams in adults, but lower amounts (7.5-10 grams) can be fatal in vulnerable people.2
What's the Emergency Treatment Timeline?
Act fast—seek ER within 8 hours for best odds. Antidote N-acetylcysteine (NAC) replenishes glutathione if given early; IV NAC is standard up to 24 hours post-overdose. Beyond that, outcomes drop sharply. Charcoal may bind unabsorbed pills if within 1-2 hours. Liver transplant is last resort for failure.[1][3]
Can You Recover from a Tylenol Overdose?
Yes, with prompt treatment: 60-80% full recovery if addressed early. Delayed care raises mortality to 30-50%. Chronic low-level overuse also risks liver injury, but single acute overdoses are more common in suicides or errors.2
How Much Tylenol Is an Overdose?
- Adults: >4g/day risky; >7.5g acute overdose.
- Children: 150 mg/kg dangerous.
- Factors like age, weight, alcohol, or drugs (e.g., opioids) lower thresholds. Always check labels—Extra Strength is 500mg per caplet.[1][3]
What Should You Do Right Now If You Suspect Overdose?
Call poison control (1-800-222-1222 in US) or 911 immediately. Do not wait for symptoms. Provide exact dose, time, and details. Home remedies like vomiting induction are dangerous—leave to pros.[2]
[1]: https://www.fda.gov/drugs/safe-disposal-medicines/disposal-unused-medicines-what-you-should-know
[2]: https://www.mayoclinic.org/drugs-supplements/acetaminophen-oral-route-rectal-route/description/drg-20068480
[3]: https://www.ncbi.nlm.nih.gov/books/NBK441917/