An alcoholic patient with liver disease and a history of opioid addiction requires post-operative analgesia. Which is the most appropriate choice?

Correct answer: C. An NSAID such as ibuprofen

• A. Acetaminophen is normally the safest first-line analgesic, but this specific combination of chronic alcohol use and established liver disease is exactly where it becomes dangerous.
• B. Tramadol is an opioid agonist with additional serotonergic activity — relapse risk, plus seizure risk, plus reliance on hepatic CYP2D6 activation.
• C. CORRECT for this patient. Acetaminophen is hepatically metabolised and chronic alcohol use both induces CYP2E1 (increasing the toxic NAPQI metabolite) and depletes glutathione (impairing its detoxification), so hepatotoxicity occurs at doses that would be safe in others. With the liver compromised and opioids off the table, an NSAID is the remaining option.
• D. This contains both an opioid, inappropriate in a patient with opioid addiction, and acetaminophen, inappropriate in liver disease. It fails on both counts.

Note: ⚑ Weigh this one carefully with the group. NSAIDs are not risk-free here either: advanced cirrhosis brings portal hypertension, varices, thrombocytopenia and hepatorenal syndrome, all of which NSAIDs worsen. In decompensated liver disease many hepatologists still prefer LOW-DOSE acetaminophen, capped at 2 g per day, over an NSAID. The exam answer is the NSAID; the real-world answer depends on how sick the liver is.