Methadone Overdose: Risks, Symptoms & Treatment

Clinical Reviewer

Methadone overdose occurs when someone takes more than an appropriate amount of the medication or when a high dose is mixed with drugs like benzodiazepines or other opioids. Usually, methadone overdose is unintentional, caused by a lack of understanding of how methadone overdose works. 

Can You Overdose on Methadone?

Yes, methadone overdose is real and can be fatal. It’s an emergency situation that always requires 9-1-1 emergency intervention.

What Happens When You Overdose on Methadone?

Methadone can cause slow or shallow breathing and dangerous changes in heartbeat that might be hard for the person to notice and react to before they become unconscious.

Methadone overdose symptoms get increasingly more concerning and can lead to death by respiratory depression if naloxone is not given to reverse the overdose. 

Early Symptoms of Methadone Overdose

Late Symptoms of Methadone Overdose

How Long Does It Take to Overdose on Methadone?

On average, overdose symptoms start 3.2 hours after taking methadone.ⓘ 

Death tends to occur 5-6 hours after taking methadone, regardless of whether the medication was taken orally or injected. 

All overdose symptoms should occur within 9 hours of taking methadone and subside within 24 hours. Though there may be long-term damage that takes days or years to recover or is permanent.

How Much Methadone Does It Take to Overdose?

The standard induction dose of methadone is only 20-30 mg even for patients with high tolerance to opioids. The dose is increased slowly usually to 80-120 mg for methadone maintenance. 

The initial dose is only 10 mg for those with low or unknown opioid dependency. And, 50 mg is estimated to be a lethal dose for many people.

See Also: The Methadone Dosage Article

How To Prevent Methadone Overdose

The most obvious way to stay safe is getting methadone from a licensed physician, being honest with the provider about your drug usage and taking the medication as directed. Understanding the concepts below can also help.

Methadone Toxicity

The effects of methadone differ from other opioids. There is less of a “high” and it takes much longer to feel the full effects, usually peaking four hours later. Taking an extra dose of methadone within the first few hours to try to get to a “high” is a known cause of overdose. 

Methadone and "Benzos"

Never use benzodiazepines (ie. Xanax) with methadone. Methadone and benzodiazepine both slow down the central nervous system. Combining these medications can cause airways to become too blocked to breathe.

See also: Methadone Drug Interactions

Can Methadone Be Injected?

Methadone cannot be injected safely.  For anyone self-injecting whether by crushing methadone pills or tablets or even by injecting the syrup directly, please understand that this can cause serious or even life-threatening vein damage and increases the likelihood of methadone overdose. 

Methadone Reversal

Always keep naloxone (Narcan) on hand when using opioids. Naloxone can reverse a methadone overdose. You will not be able to administer naloxone yourself though, so be sure to have someone that can help when using any drug illicitly. Narcan can be obtained from a local methadone clinic, pharmacy or non-profit.

Stopping Illicit Methadone Use

The best way to prevent a methadone overdose is to stop using the drug or any drugs illicitly. But, it’s never as easy as “just stopping.” If you live in Texas or Illinois, Symetria has outpatient clinics to help the withdrawal symptoms and mental chaos. (And, it’s covered by insurance). 

Get Help with Methadone

Treatment for Methadone Overdose

If this is an active overdose situation, please stop reading and call 9-1-1. Emerengy services will walk you through the steps below. 

The faster medical help is given, the less likely the overdose will be fatal.

What To Do For A Methadone Overdose

What To Do If Someone Is Not Breathing Properly

Give Rescue Breathing
Play Video
Put Them in the Recovery Position
The Recovery Position: Hand Supports Head and Knee Stops Body Roll

Will I Get in Trouble for Reporting a Methadone Overdose?

Good samaritan laws provide legal immunity from arrest and prosecution for drug possession when calling 9-1-1 in an overdose situation. 

Kansas, Oklahoma and Wyoming are the only states without a specific law. In our home states, Texas passed the Jessica Sosa Act in 2021 and Illinois amended The Good Samaritan Act in 2012.

While the person who sold the drugs potentially could still face charges, the charge could be homicide if emergency services are not called and the victim dies.

It is always, always the right thing to call 9-1-1 in an overdose situation!

How Hospitals Treat Methadone Overdoses

At the hospital, IV fluids, activated charcoal and laxatives may help flush methadone and any other drugs from the body a bit quicker. A gastric lavage (ie. stomach pump) may also be performed.

Symptoms will also be treated, including a ventilator if breathing support is needed.

Vital signs including pulse, blood pressure and breathing rate will be constantly monitored.

Additional doses of naloxone are commonly required.

What Are The Long-Term Effects of a Methadone Overdose?

Many people survive opioid overdose without any long-term damage, but possible complications include:

The sooner medical care is provided, the less likely the person will face long-lasting effects.

Is Methadone Still a Good Medication?

As with any medication, the benefits of taking methadone should outweigh the risks, including overdose. Methadone can be a safe, life-changing medication for many patients. 

(See also: Methadone Myths)

Methadone Risk for Opioid Use Disorder

Methadone is a life-saving option for those that have not been successful on Suboxone or have been successful on methadone in the past. 

Patients are monitored daily at the beginning and given appropriate amounts of medication that would not cause an overdose.

For most opioid use disorder patients, the risk of overdosing from not using methadone is much higher. Other opioids (ie. fentanyl / ISO) are 10x more likely to lead to overdose and death. The risk of a starting methadone treatment is always lower than illicit opioid use.

Methadone vs. Non-Methadone Opioid Overdoses

U.S. Overdose Deaths: Methadone Flat and Non-Methadone Skyrocketing

Methadone Risk for Chronic Pain

For chronic pain patients, methadone is not considered a first-choice medication and should not be used for mild pain, acute pain, “breakthrough” pain or on an as-needed basis. Methadone is appropriate if the pain is poorly controlled with other opioids or if the side effects of other medication options are too severe.

Symetria doctors follow rigorous sourcing guidelines and cite only trustworthy sources of information, including peer-reviewed journals, court records, academic organizations, highly regarded nonprofit organizations, government reports and their own expertise with decades in the field.

Cairns, A., Roberts, I. S. D., & Benbow, E. W. (1996). Characteristics of fatal methadone overdose in Manchester, 1985-94. BMJ313(7052), 264–265.

Caplehorn, J. R. M., & Drummer, O. H. (2002). Fatal methadone toxicity: signs and circumstances, and the role of benzodiazepines. Australian and New Zealand Journal of Public Health26(4), 358–362.

Chou, R., Weimer, M. B., & Dana, T. (2014). Methadone Overdose and Cardiac Arrhythmia Potential: Findings From a Review of the Evidence for an American Pain Society and College on Problems of Drug Dependence Clinical Practice Guideline. The Journal of Pain15(4), 338–365.

Faul, M., Bohm, M., & Alexander, C. (2017). Methadone Prescribing and Overdose and the Association with Medicaid Preferred Drug List Policies — United States, 2007–2014. MMWR. Morbidity and Mortality Weekly Report66(12), 320–323.

Kuehn, B. M. (2012). Methadone Overdose Deaths Rise With Increased Prescribing for Pain. JAMA308(8), 749.

LoVecchio, F., Pizon, A., Riley, B., Sami, A., & D’Incognito, C. (2007). Onset of symptoms after methadone overdose. The American Journal of Emergency Medicine25(1), 57–59.

Luty, J., O’Gara, C., & Sessay, M. (2005). Is methadone too dangerous for opiate addiction? BMJ331(7529), 1352–1353.

Vital signs: risk for overdose from methadone used for pain relief – United States, 1999-2010. (2012). MMWR. Morbidity and Mortality Weekly Report61(26). Retrieved from

All content is for informational purposes only. No material on this site, whether from our doctors or the community, is a substitute for seeking personalized professional medical advice, diagnosis or treatment. Never disregard advice from a qualified healthcare professional or delay seeking advice because of something you read on this website.

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  • My husband is 72 years old and has been on methadone for years and years. I just got him down to 100 mg but it still seems to be too much for him. How much can he go down and how often?

    1. Your husband should discuss his dose with the medical provider. If he is frequently groggy after taking the medication, that could be a sign he is ready for a dose reduction. We usually recommend a 5 mg reduction and then reassess after a week or two because methadone is very long-acting.

      It’s not uncommon to have mild withdrawal symptoms with each reduction, but they should be manageable and resolved in a couple of days. Tapering down slowly is not a bad thing and 100 mg is within the recommended dosage range.

    1. Absolutely! Even though the dose may seem “low,” an overdose can still be caused by adding more opiates on top. Also, anesthesiologists use multiple types of medications which can interact with methadone, increasing risk of death. If they aren’t aware of the methadone as a baseline, they will have a difficult time figuring out what could be going wrong and delay correction of it. All providers should be made aware of all medications to ensure proper and safe care.

  • Been on methadone for 2 years, same for of 95mg for a year.. how do I know if I need to raise our lower the dose? I’m having nausea, hot flashes, restlessness and anxiety..

    1. Most people do not need dose adjustments for their methadone once they have reached a stable dose. If the symptoms are due to opioid withdrawal, then the symptoms will usually be the worst right before you take your daily dose of methadone, and should resolve within 3 hours after taking your methadone dose. The symptoms should also occur consistently (i.e. every morning, not just once or twice per week). If they do not change at all, or very little, depending on the time of day relative to your methadone dose, or the symptoms are inconsistent, then they are likely due to a separate condition, not opioid withdrawal. If your methadone provider determines that the symptoms are indeed due to opioid withdrawal, then your dose should be increased until you are no longer experiencing opioid withdrawal.

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