Yes, methadone can be abused. Although it is prescribed to treat opioid addiction and chronic pain, methadone is itself a full opioid that activates the same brain receptors as heroin and morphine. It carries a lower abuse potential than those drugs, partly because of its slow onset and long duration, but misuse still occurs and can be fatal. In 2024, methadone was involved in over 3,200 overdose deaths in the United States.
Why Methadone Has Lower, but Real, Abuse Potential
Methadone works by binding to the same opioid receptors that heroin and morphine target. It produces pain relief, sedation, and a sense of well-being. What distinguishes it from shorter-acting opioids is its pharmacological profile: it acts slowly, builds up gradually in the body, and stays active for 24 to 36 hours. This means it doesn’t deliver the rapid, intense rush that makes heroin or oxycodone so addictive. For someone already tolerant to opioids, a stable daily dose of methadone prevents withdrawal without producing a significant high.
That slow onset is protective but not foolproof. When someone without opioid tolerance takes methadone, or when someone takes more than prescribed, the drug can still produce euphoria and sedation. And because methadone lingers in the body far longer than most opioids, the risk of accidental overdose is higher than many people expect. A person may take a second dose thinking the first didn’t work, not realizing it’s still building in their system.
How Methadone Gets Misused
Most methadone misuse involves diversion, meaning the medication ends up outside the supervised treatment system. Research from opioid treatment programs in Australia found that 17% of methadone clients had injected their methadone at some point in the prior year. The main source of “street” methadone is take-home doses that patients receive from clinics and then sell or share rather than taking as directed.
People misuse methadone in several ways. Some take higher doses than prescribed to chase euphoria. Others crush and inject the tablets to speed up absorption and intensify the effect. A particularly dangerous pattern is combining methadone with other sedating substances, especially anti-anxiety medications or alcohol, to amplify the high.
The Danger of Mixing With Other Substances
The most lethal form of methadone misuse involves combining it with benzodiazepines (medications like diazepam or alprazolam) or alcohol. Both opioids and benzodiazepines slow brain activity that controls breathing, and together they can suppress it to the point of death. The FDA has issued its strongest warning about this combination.
The numbers are stark. A North Carolina study found that patients taking opioids alongside a current benzodiazepine prescription had nearly four times the risk of fatal overdose compared to those taking opioids alone. Between 2004 and 2011, emergency department visits involving both opioids and benzodiazepines tripled. During that same period, the share of opioid overdose deaths that also involved benzodiazepines rose from 18% to 31%.
Signs of Methadone Toxicity
Methadone overdose looks like any other opioid overdose, but with one critical difference: it lasts much longer. The classic signs are extreme drowsiness, pinpoint pupils, and slowed or labored breathing. In clinical studies of methadone poisoning, about 75% of cases involved pinpoint pupils, 62% showed breathing difficulty, and more than half progressed to periods where breathing stopped entirely. Seizures occur in a small percentage of cases.
Because methadone stays active in the body for over a day, a person who appears to recover from an overdose can slip back into respiratory depression hours later. Naloxone, the standard opioid reversal medication, works against methadone but wears off much faster than methadone does. Medical guidelines recommend extended monitoring, sometimes 24 to 48 hours, for anyone who overdoses on methadone or other long-acting opioids. This is a key difference from heroin overdoses, where a single dose of naloxone is often enough.
Cardiac Risks at High Doses
Methadone carries a risk that most other opioids don’t: it can disrupt the heart’s electrical rhythm. At doses above 100 mg per day, methadone has been linked to a dangerous heart rhythm abnormality called QT prolongation, which can trigger a life-threatening irregular heartbeat. In one chart review, nearly 14% of patients had at least one electrocardiogram reading showing QT prolongation severe enough to be clinically concerning. This cardiac risk makes high-dose misuse especially dangerous, even for people with significant opioid tolerance.
How Clinics Try to Prevent Misuse
Methadone for opioid addiction is dispensed almost exclusively through licensed opioid treatment programs, not regular pharmacies. This is deliberate. Patients typically start by visiting the clinic daily and taking their dose under direct observation. Take-home doses are earned over time based on clinical judgment.
Under current federal guidelines from SAMHSA, patients in their first two weeks of treatment can receive up to 7 days of take-home doses. After 15 to 30 days, that increases to 14 days, and after a month, patients may receive up to 28 days of medication at once. These decisions are made on a case-by-case basis, weighing factors like whether the patient has active substance use, a history of diversion, behavioral stability, and the ability to safely store the medication at home. Each determination gets documented in the patient’s record.
These safeguards reduce but don’t eliminate diversion. The tension between making treatment accessible (fewer clinic visits, more take-home doses) and preventing misuse is one of the central challenges in methadone policy.
Withdrawal Makes Stopping Difficult
One reason people continue misusing methadone is that withdrawal is prolonged and uncomfortable. With short-acting opioids like heroin, withdrawal starts within 8 to 24 hours and typically peaks within a few days, resolving in about a week to 10 days. Methadone withdrawal doesn’t begin until 12 to 48 hours after the last dose and can last 10 to 20 days. The symptoms are the same, including muscle aches, insomnia, anxiety, nausea, and intense cravings, but the extended timeline makes the experience grueling in a different way. This prolonged withdrawal can drive people to seek methadone on the street if they lose access to their prescription.
Methadone Deaths in Context
Methadone-involved overdose deaths have been declining. CDC data shows the rate dropped 10% from 2023 to 2024, with roughly 3,229 deaths in 2024. For comparison, synthetic opioids other than methadone (primarily illicit fentanyl) killed nearly 47,735 people in 2024. Methadone accounts for a small fraction of the opioid crisis, and when used as directed in treatment programs, it remains one of the most effective tools for reducing illicit opioid use and preventing overdose. The abuse potential is real but substantially lower than the drugs it’s designed to replace.