Methadone and alcohol are both central nervous system (CNS) depressants and combining them can be life-threatening, even at doses that would be safe on their own.
If you or someone you love is on methadone treatment and drinking alcohol, this article explains exactly what happens in the body, why the risks are so severe, and what help is available.
If you think someone is overdosing right now, call 911 immediately. SAMHSA National Helpline: 1-800-662-4357 (free, confidential, 24/7)
What Is Methadone and Why Is It Prescribed?
Methadone is a long-acting, full opioid agonist used to treat moderate-to-severe pain and, more commonly, opioid use disorder (OUD). As part of medication-assisted treatment (MAT), methadone works by binding to opioid receptors in the brain - relieving withdrawal symptoms and cravings without producing the intense “high” associated with heroin or prescription painkillers like oxycodone or hydrocodone. Methadone has been used in addiction treatment for more than 50 years. According to CDC clinical guidance, medication treatment for OUD, including methadone, is associated with reduced risk of overdose and overall mortality. When methadone is used to treat opioid use disorder, federal rules (42 CFR Part 8) require that it be dispensed through a certified opioid treatment program, where dosing is closely monitored. Under SAMHSA rules updated in 2024, OTPs have more flexibility to provide take-home doses based on clinician’s judgement, which makes it even more important for patients to understand the risks of drinking at home.
How Do Methadone and Alcohol Interact in the Body?
When taken together, these effects stack on top of each other. Methadone’s FDA label carries a boxed warning, that using it with alcohol or other central nervous system depressants can cause profound sedation, dangerously slow breaking, coma and death. In one study of people stabilized on methadone, drinking about two to three standard drinks measurably impaired attention and reaction time.
What Are the Immediate Side Effects of Mixing Methadone and Alcohol?
The short-term effects of combining methadone and alcohol can appear rapidly and escalate without warning. Immediate and short-term side effects include:
- Extreme drowsiness and sedation
- Slowed or shallow breathing (respiratory depression)
- Dangerously low blood pressure (hypotension)
- Weakened heart rate (bradycardia)
- Impaired coordination and motor skills
- Loss of consciousness or blackouts
- Nausea and vomiting
- Confusion and difficulty thinking clearly
Alcohol also intensifies the intoxicating effects of methadone, meaning a person may become severely impaired after fewer drinks than they would expect. This unpredictability is itself a serious safety risk - people may not realize how impaired they are until it is too late.
What Are the Long-Term Risks of Combining Methadone and Alcohol?
Continued mixing of methadone and alcohol can cause serious, sometimes irreversible health complications. Long-term risks include:
- Respiratory failure: Chronic respiratory depression reduces oxygen delivery to vital organs, causing lasting damage to the brain, heart, and lungs.
- Liver damage: Heavy drinking damages the liver over time. For people who also have hepatitis B or C, alcohol can speed up liver scarring (cirrhosis). Methadone is also broken down by the liver, so your care team may monitor liver health during treatment.
- Increased overdose risk: Alcohol use is a recognized risk factor for overdose and death among people receiving methadone and other opioid treatment medications, because of the combined sedative effect of both substances.
- Accelerated addiction: Polysubstance use (using two or more substances together) makes both addiction patterns harder to treat and increases the likelihood of relapse.
- Irregular heart rhythm (arrhythmia): Methadone carries an FDA boxed warning for QT interval prolongation, a heart rhythm change that can lead to a dangerous arrhythmia called torsades de pointes. Tell your care team about all the alcohol use and other medications so they can decide whether you need heart rhythm monitoring.
Why Is Overdose Risk So High When Mixing These Two Substances?
When CNS depression becomes severe enough, breathing slows to a halt - and this is the primary mechanism by which methadone-alcohol combinations kill. Respiratory depression is the leading cause of opioid overdose death. Alcohol amplifies this effect by lowering the threshold at which methadone causes dangerous respiratory slowing. Critically, an overdose can occur even at therapeutic methadone doses when alcohol is added to the mix. A person taking their prescribed daily dose of methadone and consuming what they consider a moderate amount of alcohol may still experience a fatal overdose. Signs of a methadone-alcohol overdose include:
- Unresponsiveness or inability to wake the person
- Extremely slow, shallow, or stopped breathing
- Blue or grayish lips, fingernails, or skin (cyanosis)
- Cold or clammy skin
- Gurgling or choking sounds
- Limp body
- Slow or irregular heartbeat
If you observe any of these signs, call 911 immediately. Give naloxone (Narcan) if you have it. Naloxone reverses the opioid part of an overdose, including methadone, but it does not reverse alcohol. More than one dose may be needed. Methadone stays in the body a long time, and its effect on breathing can peak later and last longer than other effects, so breathing can slow down again after naloxone wears off. Call 911 even if the person wakes up, and stay with them until help arrives. CDC advises staying with someone for at least four hours after an overdose to make sure their breathing returns to normal. Naloxone nasal spray is available without a prescription at most pharmacies.
Why Do People Mix Methadone and Alcohol?
Understanding why this combination occurs helps identify who may be at risk. Unawareness of the danger. Not every person enrolled in methadone treatment fully understands the interaction risks. Some patients drink socially or habitually and don’t realize they are putting themselves in danger. Patient education is a critical but sometimes inconsistent part of OTP care. Intentional misuse. Some individuals combine methadone and alcohol deliberately to intensify the sedative effect - seeking stronger euphoria or relief from untreated pain and depression. According to NIDA, co-occurring mood disorders are common among people with opioid use disorder and are frequently underdiagnosed - meaning many people who intentionally mix substances are self-medicating conditions that haven’t been properly treated. Research suggests that about one in three people in methadone maintenance treatment also have problematic alcohol use.
What Should You Do If You’re on Methadone and Drinking Alcohol?
Do not stop methadone abruptly. Sudden discontinuation of methadone causes serious withdrawal symptoms and significantly raises your risk of opioid relapse and overdose. Any changes to your methadone dose must be made with your treatment provider. Tell your care team. If you’re drinking while on methadone, tell your prescribing physician or OTP counselor,even if that feels uncomfortable. This isn’t about judgment. It’s about keeping you safe. They can adjust your care plan, flag complications early, and connect you with additional support. Consider dual diagnosis treatment. Treating both conditions together gives you the best chance at stable recovery, because untreated alcohol use can keep raising your overdose risk while you are on methadone. If you’re unsure where to start, call us at 866.719.2173 to speak with someone at Discover Recovery. We can verify your insurance and walk you through your options at no obligation.
How Is Co-Occurring Opioid and Alcohol Use Disorder Treated?
Getting help for both opioid use disorder and alcohol use disorder at the same time can feel complicated, but treating both together is the safest approach. Untreated alcohol use can raise overdose risk and make it harder to stay stable on methadone. Medical detox is typically the first step, particularly for alcohol dependence. Alcohol withdrawal can be medically dangerous on its own and may require medication management. Methadone tapering, if appropriate, is usually done gradually rather than abruptly to minimize withdrawal severity. Medication-assisted treatment (MAT) continues to be a foundation of opioid recovery. FDA-approved medications for OUD include methadone, buprenorphine, and naltrexone. Naltrexone is approved for both alcohol use disorder and preventing relapse to opioid use, but it cannot be taken while you are on methadone. Naltrexone block opioids, so starting while methadone is still in your system can cause sudden, severe withdrawal. Your care team can help you decide whether staying on methadone, moving to buprenorphine or transitioning to naltrexone is the safest choice for you. Integrated behavioral therapy addresses the psychological drivers of both addictions, including trauma, depression, anxiety, and chronic pain, which often underlie polysubstance use. Ongoing support through individual counseling, peer support groups, and aftercare planning helps sustain long-term recovery from both disorders. At Discover Recovery, our clinical teams specialize in dual diagnosis treatment - caring for both substance use disorders and co-occurring mental health conditions at our facilities in Long Beach, WA, Camas, WA, and Portland, OR. Call 866.719.2173 to learn more or verify your insurance today.
