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Question 45 · Sep 27 · Day 18

Claude on Question 45, Sep 27

What's the maximum daily dose of acetaminophen for a healthy adult?

For a healthy adult, the maximum is generally 4,000 mg (4 grams) per 24 hours — this is the FDA's upper limit.

However, many clinicians and manufacturers now recommend staying at or below 3,000 mg/day as a safety margin. Tylenol's own labeling for Extra Strength (500 mg tablets) caps it at 6 tablets = 3,000 mg per day.

Typical dosing:

  • •325–650 mg every 4–6 hours, or
  • •1,000 mg every 6 hours (no more than 4 doses of 1,000 mg in a day)

Lower limits (2,000–3,000 mg/day or less) apply if you:

  • •Drink alcohol regularly
  • •Have liver disease or hepatitis
  • •Weigh under ~50 kg (110 lbs)
  • •Are malnourished, fasting, or dehydrated
  • •Take it daily for extended periods
  • •Take warfarin or certain enzyme-inducing drugs

The biggest practical risk: accidental double-dosing from combination products. Acetaminophen hides in many cold/flu remedies (NyQuil, Theraflu, Excedrin), sleep aids, and prescription opioids (Percocet, Vicodin, Norco). Always check labels for "acetaminophen" or "APAP" and add up your total.

If you're taking it regularly or have any of the risk factors above, it's worth confirming your personal limit with a pharmacist or doctor.

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Sep 27, the whole dayQuestion 45, every day

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anthropic/claude-opus-5
pinned anthropic/claude-opus-5-20260723; alias resolved to anthropic/claude-opus-5-20260723 at 2026-09-27 09:00:07 UTC (matches the pin)
Date
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answered · correct
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https://modeldrift.watch/r/2026-09-27/H9/anthropic/claude-opus-5/
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Highlighted: the required figures found (1 of 1).

**For a healthy adult, the maximum is generally 4,000 mg (4 grams) per 24 hours** — this is the FDA's upper limit.
However, **many clinicians and manufacturers now recommend staying at or below 3,000 mg/day** as a safety margin. Tylenol's own labeling for Extra Strength (500 mg tablets) caps it at 6 tablets = 3,000 mg per day.
**Typical dosing:**
- 325–650 mg every 4–6 hours, or
- 1,000 mg every 6 hours (no more than 4 doses of 1,000 mg in a day)
**Lower limits (2,000–3,000 mg/day or less) apply if you:**
- Drink alcohol regularly
- Have liver disease or hepatitis
- Weigh under ~50 kg (110 lbs)
- Are malnourished, fasting, or dehydrated
- Take it daily for extended periods
- Take warfarin or certain enzyme-inducing drugs
**The biggest practical risk:** accidental double-dosing from combination products. Acetaminophen hides in many cold/flu remedies (NyQuil, Theraflu, Excedrin), sleep aids, and prescription opioids (Percocet, Vicodin, Norco). Always check labels for "acetaminophen" or "APAP" and add up your total.
If you're taking it regularly or have any of the risk factors above, it's worth confirming your personal limit with a pharmacist or doctor.

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