Methadone is best described as:

• A. Short-acting opioid used for pain management
• B. Long-acting oral opioid used for heroin detoxification or maintenance
• C. Non-opioid antidepressant
• D. Opioid antagonist

Answer: (B)

Methadone is described as a long-acting oral opioid used for heroin detoxification or maintenance because its pharmacology supports stable, long-lasting mu-opioid receptor activation. Its long half-life allows once-daily dosing, which smooths out withdrawal symptoms and cravings and helps prevent the highs and lows that can drive continued illicit opioid use. Being orally administered makes it practical for outpatient programs and supervised dosing in maintenance therapy. As a full opioid agonist at the mu receptor, it can occupy receptors and blunt withdrawal, whereas opioid antagonists block effects rather than activate receptors, and non-opioid antidepressants do not act on opioid receptors. It is distinct from short-acting opioids used mainly for pain management, which don’t provide the same sustained relief or suitability for detox/maintenance programs.