Methadone withdrawal looks meaningfully different from withdrawal off shorter-acting opioids — later onset, and a longer overall course.
Why it’s different
Methadone has a very long half-life — it stays active in the body far longer than heroin, oxycodone, or fentanyl. This is exactly why it works well as a maintenance medication (steady levels, once-daily dosing), but it also means withdrawal, if it happens, unfolds on a much slower timeline.
Rough timeline
- 24–48 hours after last dose: symptoms typically begin — later onset than most other opioids
- Days 3–8: symptoms often peak, and can be more prolonged at peak intensity than shorter-acting opioid withdrawal
- 2–3 weeks or longer: acute symptoms gradually resolve — this is substantially longer than the roughly week-long acute window for heroin or oxycodone
- Months: protracted symptoms (mood, sleep, cravings) can persist longer than with shorter-acting opioids as well
Why this matters for decision-making
If you’re stopping methadone — whether by choice, a program transition, or any other reason — expect a longer process than withdrawal from a shorter- acting opioid, and plan accordingly rather than being caught off guard a week in when symptoms haven’t resolved yet.
Tapering vs. stopping abruptly
Given how long methadone withdrawal can last, a supervised taper is generally strongly preferred over abrupt discontinuation. tapering vs. stopping article building a taper plan with your doctor
Medically reviewed by [pending]. Sources: SAMHSA TIP 63, 42 CFR Part 8 (federal OTP regulations).