What is the maximum recommended daily dose of acetaminophen?

What is the maximum recommended daily dose of acetaminophen?

• A. 2 g/day
• B. 4 g/day
• C. 6 g/day
• D. 3 g/day

Answer: (B)

Dosing acetaminophen safely hinges on protecting the liver. For healthy adults, the maximum daily amount is 4,000 mg (4 g) in a 24-hour period. This ceiling reflects how the drug is metabolized: most goes through safer pathways, but a portion is converted by liver enzymes into a toxic metabolite (NAPQI). When total daily intake is high, glutathione stores can be overwhelmed, allowing NAPQI to cause liver injury. Keeping total daily acetaminophen at or below 4 g minimizes this risk. Remember to count all sources—prescriptions and any over-the-counter products—so you don’t inadvertently exceed the limit. In people with liver disease, chronic alcohol use, malnutrition, or advanced age, a lower limit (often about 3 g/day or less) is frequently advised. If an overdose is suspected, prompt treatment with N-acetylcysteine is important.

Dosing acetaminophen safely hinges on protecting the liver. For healthy adults, the maximum daily amount is 4,000 mg (4 g) in a 24-hour period. This ceiling reflects how the drug is metabolized: most goes through safer pathways, but a portion is converted by liver enzymes into a toxic metabolite (NAPQI). When total daily intake is high, glutathione stores can be overwhelmed, allowing NAPQI to cause liver injury. Keeping total daily acetaminophen at or below 4 g minimizes this risk. Remember to count all sources—prescriptions and any over-the-counter products—so you don’t inadvertently exceed the limit. In people with liver disease, chronic alcohol use, malnutrition, or advanced age, a lower limit (often about 3 g/day or less) is frequently advised. If an overdose is suspected, prompt treatment with N-acetylcysteine is important.