Methadone is administered by which routes?

Methadone is administered by which routes?

• A. SC, IV
• B. IV, IM
• C. PO, IM
• D. PO, IV

Answer: (D)

The main idea here is how the route of administration affects how methadone reaches the bloodstream and acts in the body. Methadone is effectively used when given by mouth or by IV, because those routes provide reliable and controllable levels. Oral methadone has good bioavailability, meaning a substantial portion reaches systemic circulation when swallowed. This makes it ideal for maintenance therapy and outpatient dosing, where a steady, long-lasting effect is desired given methadone’s long half-life. Intravenous methadone, on the other hand, delivers the full dose directly into the bloodstream, giving rapid and predictable onset of effect—useful in hospital settings for acute analgesia or when oral intake isn’t possible and precise titration is needed. Routes like intramuscular or subcutaneous injections tend to produce highly variable absorption with methadone, leading to unpredictable plasma levels and slower, less reliable onset. This variability makes them impractical for standard therapeutic use, which is why they aren’t typical choices. So, the standard administration routes are oral and intravenous.

The main idea here is how the route of administration affects how methadone reaches the bloodstream and acts in the body. Methadone is effectively used when given by mouth or by IV, because those routes provide reliable and controllable levels.

Oral methadone has good bioavailability, meaning a substantial portion reaches systemic circulation when swallowed. This makes it ideal for maintenance therapy and outpatient dosing, where a steady, long-lasting effect is desired given methadone’s long half-life. Intravenous methadone, on the other hand, delivers the full dose directly into the bloodstream, giving rapid and predictable onset of effect—useful in hospital settings for acute analgesia or when oral intake isn’t possible and precise titration is needed.

Routes like intramuscular or subcutaneous injections tend to produce highly variable absorption with methadone, leading to unpredictable plasma levels and slower, less reliable onset. This variability makes them impractical for standard therapeutic use, which is why they aren’t typical choices.

So, the standard administration routes are oral and intravenous.