Methadone treatment is a long-term medication-based approach to opioid use disorder. A person takes a daily dose of methadone, a synthetic opioid, to stop withdrawal symptoms and reduce cravings for heroin or other opioids. Unlike short-term detox, the goal is sustained stability: people often stay on methadone for months, years, or indefinitely while they rebuild their daily lives. It is one of the most studied treatments in addiction medicine, with decades of evidence showing it significantly lowers the risk of overdose death and relapse.
How Methadone Works in the Body
Methadone activates the same brain receptors that heroin, fentanyl, and prescription painkillers target. Because it’s a full opioid, it satisfies the receptor well enough to prevent withdrawal and quiet cravings. But methadone is taken by mouth, absorbs slowly, and lasts much longer than street opioids, so it produces a stable, even effect rather than the rapid high-and-crash cycle that drives compulsive use. At a properly adjusted dose, a person feels normal rather than euphoric or sedated.
Methadone also blocks a separate receptor involved in pain signaling and tolerance (the NMDA receptor). This may be one reason it’s particularly effective at reducing opioid cravings over time, because it works through a slightly different pathway than other opioids.
What a Typical Treatment Looks Like
Methadone for opioid use disorder can only be dispensed through federally licensed opioid treatment programs (OTPs), sometimes called methadone clinics. This is different from buprenorphine, which a doctor can prescribe from a regular office. For most new patients, treatment means visiting the clinic daily to take a dose under observation.
Treatment starts with an induction phase. Federal regulations cap the first dose at 30 mg, with no more than 40 mg total on day one. The clinic reassesses within a few hours to check how you’re responding. Over the first one to two weeks, the dose is gradually increased while clinicians watch closely for signs of oversedation, since methadone builds up in the body and the risk of accidental overdose is highest during this early window.
Once stable, most people settle into a maintenance dose between 60 and 120 mg per day, though some respond to lower amounts. There’s strong evidence that higher doses within this range improve retention and reduce continued drug use, so clinics generally aim for whatever dose fully controls cravings rather than defaulting to the minimum.
As patients demonstrate stability, they can earn take-home doses, reducing how often they need to visit the clinic. Federal rules updated in early 2024 made permanent several flexibilities introduced during the COVID-19 pandemic, expanding the criteria for take-home privileges and easing access overall.
How Effective Methadone Is
The mortality data is striking. A large systematic review published in The BMJ found that the all-cause death rate while on methadone treatment was 11.3 per 1,000 person-years, compared to 36.1 per 1,000 person-years when out of treatment. That means people not in treatment died at more than three times the rate. Overdose deaths specifically dropped even more sharply: 2.6 per 1,000 person-years in treatment versus 12.7 out of treatment, nearly a fivefold difference. On average, staying in methadone treatment prevented about 25 deaths per 1,000 person-years.
Retention is the other key measure, because treatment only works if people stay in it. In a multi-site trial comparing methadone to buprenorphine (the other main medication for opioid use disorder), 74% of methadone patients completed 24 weeks of treatment, compared to 46% on buprenorphine. Methadone patients averaged about 141 days in treatment over that period versus 104 days for buprenorphine. However, among those who did stay on buprenorphine, rates of continued illicit opioid use were actually lower than for methadone patients during the first nine weeks, so the two medications have different strengths.
Methadone vs. Buprenorphine
The choice between methadone and buprenorphine often comes down to practical factors as much as pharmacology. Methadone requires clinic visits, which provides built-in structure and accountability but can be disruptive to work schedules and daily life. Buprenorphine can be prescribed in a regular doctor’s office and taken at home from the start, offering more flexibility but less supervision.
Methadone tends to be the better option for people with severe, long-standing opioid dependence or those who haven’t responded to buprenorphine. Its higher retention rates suggest it may be more effective at keeping people engaged in treatment. Buprenorphine, on the other hand, has a lower risk of overdose because it’s a partial opioid (it activates the receptor less fully), and some people prefer the convenience and privacy of office-based care.
Risks and Side Effects
Methadone is a potent opioid, and it carries real risks. The most dangerous period is the first two weeks, before the body has fully adjusted to the dose. Because methadone has a long half-life, it can accumulate in the system faster than expected, and oversedation can sneak up on someone who felt fine after their morning dose.
One specific cardiac concern: methadone can lengthen the QT interval on an electrocardiogram, which in rare cases triggers a dangerous heart rhythm. A QTc above 500 milliseconds is generally considered the threshold for serious risk. Clinics may screen with an ECG before starting treatment, particularly for patients on higher doses (above 100 to 120 mg per day) or those with other risk factors like heart conditions or certain medications.
Combining methadone with benzodiazepines or alcohol is especially dangerous. Both substances suppress breathing on their own, but when combined with an opioid, the respiratory depression can become severe or fatal. Studies show that benzodiazepines taken alongside methadone increase the opioid’s subjective effects and deepen sedation beyond what either drug produces alone. This combination is one of the most common factors in opioid-related overdose deaths.
Common, less dangerous side effects include constipation, sweating, drowsiness, and reduced sex drive. Most of these improve with time or dose adjustment.
Methadone During Pregnancy
Methadone is considered the standard of care for pregnant women with opioid use disorder. Four decades of research support its relative safety in this population. Compared to untreated heroin dependence, methadone treatment improves fetal growth, increases the likelihood of receiving prenatal care, and reduces the risks of fetal death, HIV infection, and preeclampsia. Critically, it replaces the dangerous cycle of intoxication and withdrawal that heroin causes, which can be harmful to the fetus.
The main concern is neonatal abstinence syndrome (NAS), a set of withdrawal symptoms that can appear in newborns after delivery. In one well-known study (the MOTHER trial), about 56% of infants born to mothers on methadone needed treatment for NAS, typically with small doses of morphine over an average of about 22 days. Importantly, a systematic review of 29 studies found that the severity of NAS did not differ based on whether mothers were on high or low doses of methadone. This means providers don’t need to lower a mother’s dose to protect the baby, which is reassuring because an inadequate dose increases the risk of relapse.
Cost and Access
The cost of methadone treatment varies by clinic and location, but research has put the average patient cost for clinic-based methadone at roughly $90 to $95 per month. This is relatively affordable compared to many medical treatments, though daily clinic visits add indirect costs in time and transportation. Medicaid covers methadone treatment in most states, and the 2024 federal rule changes aim to further expand access through opioid treatment programs.
The biggest barrier for many people isn’t cost but logistics. Not every area has a methadone clinic, and daily visits during induction can conflict with employment or childcare. Rural communities are particularly underserved. The expanded take-home rules help, but the early weeks of treatment still require a significant time commitment that not everyone can manage without support.