Regular alcohol consumption with acetaminophen increases risk of liver injury; what is the maximum daily acetaminophen dose to limit risk?

• A. 3000 mg
• B. 4000 mg
• C. 2000 mg
• D. 5000 mg

Answer: (B)

Regular alcohol use increases the risk of acetaminophen-induced liver injury because alcohol boosts the formation of the toxic metabolite and depletes liver glutathione, making it harder to detoxify that metabolite. The standard upper limit for daily acetaminophen in adults is 4,000 mg (4 g). Keeping within this amount helps minimize the chance of reaching a toxic level, even when alcohol is involved, while still providing analgesia. In practice, clinicians emphasize using the lowest effective dose, avoiding simultaneous alcohol intake, and watching for liver disease or other risk factors that would warrant even stricter limits.