Medications for Opioid Use Disorder
There are three FDA-approved medication categories for opioid use disorder (OUD): methadone, buprenorphine, and naltrexone. These medications work differently, are accessed through different treatment settings, and are not interchangeable in every clinical situation. U.S. Food and Drug Administration
Methadone and buprenorphine can reduce opioid withdrawal and cravings. Naltrexone blocks opioid receptors and is used after an appropriate opioid-free period.
Medication treatment for OUD is commonly called MOUD — Medications for Opioid Use Disorder. The older term MAT, or Medication-Assisted Treatment, remains widely recognized. See MAT vs. MOUD for the terminology difference.
MOUD is evidence-based medical treatment—not simply replacing one drug with another. SAMHSA states that these medications can support recovery, normalize body functions, and be used safely for long-term treatment when clinically appropriate. SAMHSA
What Medications Are Used for Opioid Use Disorder?
Methadone
Buprenorphine
Naltrexone
| Methadone | Buprenorphine | Naltrexone | |
|---|---|---|---|
| Medication type | Full opioid agonist | Partial opioid agonist | Opioid antagonist |
| Main effect | Reduces withdrawal and cravings | Reduces withdrawal and cravings | Blocks opioid effects |
| Requires opioid-free period first? | No | Initiation timing requires clinical assessment | Yes |
| Where available | Certified OTP | Office-based care, clinics, telehealth where allowed, OTPs | Medical/addiction-treatment settings |
| Controlled medication | Yes | Yes | No |
| Long-term treatment possible | Yes | Yes | Yes |
| Common forms | Oral medication through OTP | Sublingual/buccal products and extended-release injections | Extended-release injection for OUD |
There is no single medication that should automatically be selected for everyone.
The treatment decision should consider current opioid use, withdrawal, previous treatment, overdose history, physical and mental health, other medications, pregnancy when relevant, access to care, and patient preference.
Methadone for Opioid Use Disorder
Methadone is a long-acting full opioid agonist.
When taken as prescribed for OUD, it can reduce opioid withdrawal and cravings and help stabilize opioid receptor activity without the repeated peaks and crashes associated with short-acting illicit opioids. SAMHSA
A major difference is where methadone can be obtained.
For opioid use disorder in the United States, methadone generally must be dispensed through a SAMHSA-certified Opioid Treatment Program (OTP). The revised federal rules did not change this core requirement. SAMHSA
Current OTP regulations are more flexible than many older articles suggest. Updated 42 CFR Part 8 rules allow greater clinical discretion around take-home medication, including consideration of take-home doses early in treatment when appropriate. SAMHSA
Read more about methadone treatment for opioid use disorder and how Opioid Treatment Programs work.
Buprenorphine for Opioid Use Disorder
Buprenorphine is a partial opioid agonist.
It can reduce opioid withdrawal and cravings while producing weaker opioid-receptor activation than full agonists such as methadone. SAMHSA
One major advantage from an access perspective is that buprenorphine can be prescribed in a much wider range of healthcare settings.
The old federal X-waiver is no longer required. Practitioners with appropriate DEA authority may prescribe buprenorphine for OUD where permitted by state law. SAMHSA removed its former individual waiver-search system in June 2026 because that special waiver no longer exists. SAMHSA
FDA-approved buprenorphine products include sublingual or buccal medications containing buprenorphine alone or buprenorphine/naloxone, as well as extended-release injections. FDA currently lists products including Suboxone, Sublocade, and Brixadi among approved MOUD options. U.S. Food and Drug Administration
Sublingual / Buccal
Buprenorphine-only or buprenorphine/naloxone products taken in the mouth.
Weekly Injection
Extended-release buprenorphine options may include weekly administration where indicated.
Monthly Injection
Extended-release products can also provide monthly treatment options under approved indications.
Readers can continue to buprenorphine treatment, Suboxone treatment, Sublocade treatment, or Brixadi treatment.
Naltrexone for Opioid Use Disorder
Naltrexone works differently from methadone and buprenorphine.
It is an opioid antagonist, meaning it blocks opioid receptors rather than activating them.
For OUD, SAMHSA identifies extended-release injectable naltrexone as the FDA-approved formulation. It is typically administered about once a month by a healthcare professional. SAMHSA
A key limitation is initiation.
Naltrexone cannot generally be started while opioids remain active in the body because it can trigger sudden withdrawal. A sufficient opioid-free interval is therefore required before treatment begins, with the exact timing determined by opioid exposure and clinical assessment. CDC
That initiation requirement is an important difference from methadone and buprenorphine.
Read more about naltrexone for opioid use disorder and Vivitrol for opioid use disorder.
Are All Three OUD Medications Equally Suitable?
Not necessarily.
All three are FDA-approved OUD treatments, but they differ in their evidence base, initiation requirements, treatment setting, and practical accessibility.
CDC's clinical guideline notes that methadone and buprenorphine have particularly strong evidence for reducing overdose and all-cause mortality. It also notes that naltrexone can be effective after successful initiation, but completing the required opioid-free period can make starting treatment more difficult for some people. CDC
This is why the medications should not simply be presented as three identical options with different brand names.
The goal is shared decision-making, not selecting one universal medication for everyone.
Do These Medications Work for Fentanyl, Heroin, and Prescription Opioids?
MOUD is used to treat opioid use disorder, rather than having a separate medication for every opioid involved.
That means methadone, buprenorphine, and naltrexone may be considered when OUD involves substances such as fentanyl, heroin, oxycodone, hydrocodone, or other opioids.
The exact treatment approach may differ because factors such as fentanyl exposure, physical dependence, withdrawal patterns, and overdose risk can influence medication initiation and monitoring.
The medication should therefore be selected based on the person's OUD and clinical situation—not simply the name of the opioid being used.
Is Detox Enough Without OUD Medication?
Withdrawal Management ≠ Ongoing OUD TreatmentFor people with opioid use disorder, detoxification or withdrawal management alone is not recommended as the complete treatment approach.
CDC states that detoxification without MOUD increases the risk of returning to opioid use, overdose, and overdose death. CDC
Withdrawal management may still be medically necessary in some situations, but completing withdrawal does not remove the longer-term risks associated with OUD.
This distinction is especially relevant for naltrexone: a person needs to complete an opioid-free period before initiation, but that opioid-free period is a preparation step—not the treatment itself.
Is Naloxone a Medication for Opioid Use Disorder?
MOUD
Methadone • Buprenorphine • Naltrexone
Treats opioid use disorder.
Overdose-Reversal Medication
Naloxone
Reverses an opioid overdose.
Naloxone is extremely important, but it is not MOUD.
Naloxone is an emergency opioid-overdose reversal medication. It temporarily blocks opioid effects during an overdose but does not treat cravings, withdrawal, or OUD over time. SAMHSA
People receiving MOUD may still benefit from having naloxone available because overdose risk can return if treatment is interrupted or illicit opioid use occurs. FDA recommends discussing naloxone with people receiving OUD medications. U.S. Food and Drug Administration
See naloxone and MAT for more information.
Does MOUD Have to Include Counseling?
Medication Is Treatment. Counseling Can Be Added Based on Need.Counseling, peer support, case management, and behavioral treatment can be valuable parts of care.
However, current federal policy does not support making medication access contingent on counseling participation.
FDA says OUD treatment should include an offer of counseling or other services where possible, but patients should not be denied medication simply because they do not participate in those additional services. U.S. Food and Drug Administration
SAMHSA's revised OTP rules similarly state that patients cannot be denied OTP medication services solely because they choose not to participate in counseling. SAMHSA
See does MAT require counseling? for the full explanation.
How Long Are OUD Medications Used?
There is no universal short treatment period.
SAMHSA states that OUD medications can be used safely for months to a lifetime, depending on the person's needs. SAMHSA
Methadone and buprenorphine are often used as long-term maintenance treatments. Extended-release naltrexone also does not have one universal stopping date.
Stopping medication should be based on individualized reassessment—not an arbitrary 30-, 90-, or 365-day limit.
How Many People Receive Medications for OUD?
SAMHSA's 2025 National Survey on Drug Use and Health estimated that approximately 4.0 million U.S. people aged 12 or older had opioid use disorder in the past year, while about 623,000 of them—15.7%—received medications for OUD during that year. SAMHSA
This means medication treatment remains substantially underused even though evidence-based options are available.
Where Can You Get OUD Medication?
Access differs by medication.
OTP
Methadone: For OUD, methadone is generally dispensed through a SAMHSA-certified OTP. SAMHSA
Office-Based / Medical Clinic
Buprenorphine: May be available through addiction-medicine practices, primary-care settings, behavioral-health clinics, and OTPs. The former federal X-waiver is no longer required. SAMHSA
Telehealth Where Permitted
Buprenorphine may be available through telehealth programs where permitted. Naltrexone can be provided in a wider range of medical or addiction-treatment settings, with extended-release OUD medication physically administered by a practitioner. SAMHSA
Readers can start with the MAT clinic directory when comparing local treatment providers.
How Is an OUD Medication Chosen?
Medication selection should be a shared clinical decision.
There is no online questionnaire that can safely determine the correct medication for every person.
A healthcare professional may consider whether someone is currently opioid-dependent, how recently opioids were used, whether an opioid-free period is realistic, previous experience with MOUD, overdose risk, other substance use, medical conditions, other prescriptions, practical clinic access, and personal preferences.
Current Opioid Use
How recently opioids were used and whether dependence is present.
Withdrawal
Current or expected withdrawal can affect initiation planning.
Previous Treatment
Past response to MOUD can help inform discussion.
Medical History
Other conditions, substances, and prescriptions may matter.
Access & Lifestyle
Treatment setting, transportation, and visit requirements can affect feasibility.
Patient Preference
Preferences and treatment goals are part of shared decision-making.
Someone who wants methadone will generally need access to an OTP. Someone who prefers office-based treatment may have more flexibility with buprenorphine or naltrexone. Someone unable to complete an opioid-free period may face practical difficulty beginning naltrexone.
These differences make the treatment setting and initiation process just as important as the medication name.
Frequently Asked Questions About OUD Medications
What are the three FDA-approved medications for opioid use disorder?
The three medication categories are methadone, buprenorphine, and naltrexone. U.S. Food and Drug Administration
Which medications reduce opioid withdrawal and cravings?
Methadone and buprenorphine reduce withdrawal and cravings through opioid-receptor activity. Naltrexone works differently by blocking opioid receptors. CDC
Is Suboxone the same as buprenorphine?
Suboxone is a medication containing buprenorphine and naloxone. It is one of several FDA-approved buprenorphine products for OUD. U.S. Food and Drug Administration
What are Sublocade and Brixadi?
Both are extended-release buprenorphine injections for OUD. FDA lists Sublocade as an extended-release subcutaneous buprenorphine product, while Brixadi provides weekly and monthly extended-release options under its approved indications. U.S. Food and Drug Administration
Can methadone be prescribed by a regular doctor for OUD?
Not under the current federal OUD framework. Methadone for OUD generally must be dispensed through a SAMHSA-certified OTP. SAMHSA
Is the X-waiver still required for Suboxone or buprenorphine?
No. The federal DATA/X-waiver requirement was eliminated, and SAMHSA's former waiver system was decommissioned in June 2026. State requirements can still apply. SAMHSA
Does naltrexone require detox first?
A person must be sufficiently opioid-free before beginning naltrexone for OUD. Starting it while opioids remain active can cause precipitated withdrawal, so initiation requires clinical assessment. CDC
Is naloxone one of the three MOUD medications?
No. Naloxone is an overdose-reversal medication, not ongoing treatment for OUD. SAMHSA
Do people need to stop MOUD after one year?
Not automatically. OUD medication may continue for months, years, or longer when it remains appropriate and beneficial. SAMHSA
Can MOUD treat fentanyl use disorder?
There is not a separate FDA medication specifically called a “fentanyl medication.” When fentanyl use meets criteria for opioid use disorder, clinicians can consider established MOUD options based on the individual's clinical circumstances.
Find Medication Treatment for Opioid Use Disorder
Methadone, buprenorphine, and naltrexone all provide evidence-based treatment options for opioid use disorder, but they differ substantially in how they work, how treatment begins, and where medication can be obtained.
A qualified clinician can help compare those differences based on the person's OUD, medical needs, treatment goals, and access to care.
Important Safety Information
This page provides general information about medications for opioid use disorder. It is not medical advice and should not be used to start, stop, switch, or change methadone, buprenorphine, naltrexone, or another medication.
Medication selection and initiation depend on individual opioid exposure, withdrawal, medical history, other medications and substances, treatment setting, and clinician assessment.