Claude on Question 45, Sep 20

General maximum for a healthy adult: 4,000 mg (4 grams) per 24 hours

This is the long-standing upper limit used clinically. However, many manufacturers and clinicians now recommend a more conservative 3,000 mg per day for over-the-counter use, to build in a safety margin against accidental overdose.

Typical dosing:

• •Regular strength (325 mg): 2 tablets every 4–6 hours, max 10 tablets/day
• •Extra strength (500 mg): 2 tablets every 6 hours, max 6 tablets/day (3,000 mg)
• •650 mg extended release: 2 tablets every 8 hours

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

• •Drink alcohol regularly or heavily
• •Have liver disease or hepatitis
• •Are malnourished, fasting, or dehydrated
• •Weigh under ~50 kg (110 lb)
• •Take other medications that stress the liver
• •Use it daily long-term

The biggest real-world risk: double-dosing without realizing it. Acetaminophen is hidden in hundreds of combination products — cold and flu remedies, sleep aids, menstrual formulas, and prescription opioid combinations (Percocet, Vicodin, Norco). Always check labels for "acetaminophen" or "APAP."

Also worth knowing: Don't self-treat pain beyond 10 days or fever beyond 3 days without medical advice. Acetaminophen overdose is the leading cause of acute liver failure in the U.S., and symptoms may not appear for 24–48 hours — so if an overdose is suspected, seek care immediately rather than waiting for symptoms (Poison Control in the U.S.: 1-800-222-1222).

If you have any liver concerns, drink alcohol regularly, or are planning to take it daily, it's worth confirming your personal limit with a pharmacist or doctor.