Three FDA-approved medications change outcomes for people with opioid use disorder. This guide explains what each one does, how it works, and what to expect during treatment.
MAT is not simply taking a pill. It is a structured clinical approach that addresses the biological component of opioid use disorder while counseling and peer support address the behavioral and social dimensions.
When opioids are used repeatedly, the brain adapts in ways that make stopping without help extremely difficult. The medications used in MAT work at the brain's opioid receptors. They reduce cravings, prevent withdrawal, and block the euphoric effects of other opioids, which stabilizes the brain chemistry that addiction has disrupted.
Research consistently shows that people who receive MAT have better survival, retention in treatment, and long-term recovery outcomes than those who attempt abstinence-only approaches without medication.
"Medications for opioid use disorder are not a crutch. They are the treatment. Withholding them is like withholding insulin from a person with diabetes."
ASAM Opioid Use Disorder Patient Guide 2025All three medications are FDA-approved treatments for opioid use disorder and may produce positive results on standard drug panels. Positive results from prescribed MAT medications are not evidence of illicit drug use and should be interpreted in clinical context.
Buprenorphine is a partial opioid agonist. It activates the brain's opioid receptors enough to prevent withdrawal and reduce cravings without producing the intense euphoria of full agonists like heroin or oxycodone.
Methadone is a full opioid agonist. At therapeutic doses it eliminates withdrawal symptoms and cravings without producing euphoria. It must be dispensed through federally certified opioid treatment programs (OTPs).
Naltrexone is an opioid antagonist. It binds tightly to opioid receptors without activating them, blocking any opioid from producing an effect. It has no abuse potential and is not a controlled substance.
Addiction is defined by compulsive use despite harm. People taking MAT as prescribed are not experiencing addiction. They are receiving treatment for a chronic disease. Dependence on a medication is not the same as addiction to a substance.
ASAM, SAMHSA, and every major addiction medicine organization define recovery broadly to include individuals who are stable on MAT. Medication is a component of treatment, not a barrier to recovery.
For some people, indefinite maintenance is the most effective treatment. Research shows higher rates of return to use after tapering. Duration of treatment should be determined clinically, not by a predetermined timeline or program policy.
A positive result for a prescribed MAT medication is expected and appropriate. It should be confirmed by the prescribing provider's records, not treated as evidence of a violation.
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Find Treatment →New to this series? Guide 01 explains the biology of addiction and why treatment works.
Read Guide 01 →Clinical Reference
For a comprehensive patient-facing overview of opioid use disorder treatment, see the ASAM Opioid Use Disorder Patient Guide 2025, published by the American Society of Addiction Medicine and Guideline Central.
This guide is for general educational purposes only and does not constitute medical advice. If you are experiencing a medical emergency, call 911. For substance use support, contact SAMHSA at 1-800-662-4357.
Educational content is for general informational purposes only and does not constitute medical advice. Consult a qualified healthcare provider for guidance specific to your situation.