All three are FDA-approved, evidence-based medications for opioid use disorder. This page gives the complete picture; our [interactive MAT comparison tool] lets you filter by what matters most to your specific situation.
The core mechanism difference
- Buprenorphine: partial opioid agonist — activates receptors partially, with a ceiling effect
- Methadone: full opioid agonist — activates receptors fully, in a controlled, long-acting way
- Naltrexone: opioid antagonist — blocks receptors entirely, producing no opioid effect itself
Starting requirements
- Buprenorphine: usually started once mild-to-moderate withdrawal has begun, or via low-dose induction methods [link]
- Methadone: can often be started without waiting for withdrawal, under clinic supervision, with careful gradual dosing
- Naltrexone: requires being fully opioid-free for roughly 7–10 days first — by far the most demanding starting requirement of the three [link]
Where you get each one
- Buprenorphine: any appropriately registered prescriber (since the X-waiver was eliminated in 2023), telehealth options widely available [link]
- Methadone: federally certified Opioid Treatment Programs only [link]
- Naltrexone: any prescriber — no specialized clinic requirement
Effectiveness
All three are associated with substantially reduced overdose mortality compared to no medication treatment. Some evidence suggests buprenorphine and methadone may have a modest edge in treatment retention compared to naltrexone, likely related in part to naltrexone’s more demanding start (the opioid-free window causing some people to drop out before ever starting) — this doesn’t mean naltrexone is less effective once someone is successfully on it, but the barrier to starting is real and affects real-world outcomes.
Missed dose consequences
- Buprenorphine: a single missed daily dose is usually manageable given its long half-life
- Methadone: several missed days can meaningfully lower tolerance, requiring dose reassessment
- Naltrexone: a missed monthly injection means opioid tolerance may return, creating real overdose risk if opioids are used afterward at a previous dose
Pregnancy
- Buprenorphine and methadone: both considered standard-of-care options
- Naltrexone: less studied in pregnancy; typically a more cautious, individualized discussion between OB and addiction specialist
Which one is right for you
There’s no universally “best” option — it depends on your tolerance level, access to different types of providers, comfort with the required starting process, pregnancy status, and personal preference. [interactive MAT comparison tool] to filter this by your specific priorities.
Medically reviewed by [pending]. Sources: SAMHSA TIP 63, ASAM National Practice Guideline, comparative effectiveness literature on MOUD.