Claude on Question 45, Sep 12

For a healthy adult: up to 4,000 mg (4 grams) per 24 hours is the traditional maximum, though 3,000 mg/day is the more commonly recommended ceiling now — and it's what appears on most current U.S. OTC labels (e.g., Extra Strength Tylenol lists 3,000 mg/day). Many clinicians favor the lower number to build in a safety margin.

Per dose: 325–1,000 mg every 4–6 hours, not exceeding 1,000 mg in a single dose.

Important caveats:

• •Check for hidden acetaminophen. It's in hundreds of combination products — cold/flu remedies, sleep aids, and prescription opioids like Percocet, Vicodin, and Norco. Accidental "double-dipping" is the most common cause of overdose, and acetaminophen toxicity is the leading cause of acute liver failure in the U.S.
• •Lower limits apply if you: drink alcohol regularly (3+ drinks/day), have liver disease or hepatitis, are malnourished or fasting, have low body weight, or are elderly. In these cases 2,000 mg/day or less is often advised — worth discussing with a doctor.
• •Long-term daily use should be supervised by a clinician rather than self-managed.
• •Warfarin users: regular acetaminophen can raise INR, so monitoring may be needed.

If you're weighing this for a specific situation — a particular health condition, other medications, or ongoing pain — that's worth running by a pharmacist or physician, since they can factor in your full picture. Pharmacists are very accessible for exactly this kind of question.