A 42-year-old woman with opioid dependence (using heroin 3–4 times daily) presents to your clinic. She has moderate motivation for treatment and is concerned about withdrawal symptoms. She also has a history of hepatitis C and mild liver dysfunction. Which is the drug of choice for maintenance therapy in this patient?

Explanation

## Maintenance Treatment in Moderate-Motivation OUD with Hepatic Impairment ### Why Buprenorphine Is Optimal Here **Key Point:** Buprenorphine is the first-line maintenance agent for opioid use disorder in patients with moderate motivation, hepatic impairment, and concern about withdrawal. It combines efficacy with safety and lower abuse potential. **High-Yield:** Buprenorphine is a partial mu-receptor agonist with a ceiling effect on respiratory depression, making it safer than full agonists. It is metabolized hepatically but is safer in mild-to-moderate liver disease than methadone. ### Clinical Advantages of Buprenorphine 1. **Partial agonist** — produces mild opioid-like effects, reducing cravings without euphoria 2. **Ceiling effect** — respiratory depression plateaus at higher doses (safer overdose profile) 3. **Lower abuse potential** — less diverted than methadone 4. **Milder withdrawal** — easier to discontinue if needed 5. **Office-based treatment** — can be prescribed in primary care (unlike methadone, which requires specialized clinics) 6. **Hepatic safety** — safer in mild-to-moderate liver disease than methadone (which accumulates with cirrhosis) ### Comparison of Agents in This Clinical Context | Agent | Motivation Level | Hepatic Safety | Withdrawal Severity | Abuse Risk | Suitable Here? | |-------|-----------------|-----------------|-------------------|-----------|----------------| | **Buprenorphine** | Moderate–high | Safe in mild–moderate cirrhosis | Mild–moderate | Low | **YES** | | Methadone | Low–moderate | Risky (accumulates in cirrhosis) | Severe | High | No (liver disease) | | Naltrexone | High (abstinence-focused) | Safe | None | None | No (moderate motivation) | | Naloxone | Emergency only | Safe | N/A | None | No (not for maintenance) | **Clinical Pearl:** In hepatitis C or mild cirrhosis, buprenorphine is preferred over methadone because methadone undergoes hepatic metabolism and can accumulate, increasing toxicity risk. ### Why Not the Other Options? - **Methadone:** Full agonist with high abuse potential and severe withdrawal; contraindicated in hepatic impairment (accumulation risk). - **Naltrexone:** Requires complete detoxification and high motivation for abstinence; this patient has moderate motivation and fears withdrawal. - **Extended-release naloxone:** Not a recognized maintenance agent; naloxone is for emergency overdose reversal only. **Mnemonic:** **BUPRE** = **B**est for **U**se in **P**rimary care, **R**espiratory **E**ffect ceiling (safe in overdose). [cite:Harrison 21e Ch 395; KD Tripathi 8e Ch 42]