Claude on Question 45, Sep 22

For a healthy adult, the general limits are:

• •4,000 mg (4 g) per day — the maximum recommended by the FDA
• •3,000 mg per day — the more conservative limit now printed on many OTC labels (e.g., Extra Strength Tylenol), which provides a safety margin
• •Single dose: 650–1,000 mg, no more frequently than every 4–6 hours

Lower limits (often 2,000 mg/day or less) apply if you:

• •Drink alcohol regularly (3+ drinks/day)
• •Have liver disease or hepatitis
• •Are malnourished, underweight, or fasting
• •Are taking it daily for more than a few days
• •Are elderly or on medications that affect the liver

The biggest real-world risk: accidental double-dosing. Acetaminophen is hidden in hundreds of combination products — cold and flu remedies (NyQuil, Theraflu), prescription opioids (Percocet, Vicodin, Norco), and sleep aids (Tylenol PM). Check the active ingredients on everything you're taking, including anything listing "APAP" or "paracetamol."

Acetaminophen overdose is the leading cause of acute liver failure in the U.S., and the toxic threshold isn't dramatically above the therapeutic one — so the margin matters.

If you're taking it regularly for ongoing pain, that's worth a conversation with your doctor or pharmacist about your specific situation.