Methadone (Dolophine, Methadose)

What it treats

Methadone is approved by the U.S. Food and Drug Administration for two things: the treatment of opioid use disorder (OUD) and the management of pain severe enough to require a daily, long-term opioid when other options are inadequate.

For OUD, it's one of three FDA-approved medications (with buprenorphine and extended-release naltrexone) and it has the strongest evidence for retention in treatment and reduction in mortality of any option. It's the medication most often reached for in people with a long, heavy opioid history who haven't done well on buprenorphine.

How it works

Methadone binds fully and strongly to the µ (mu) opioid receptor. That's the same receptor that heroin, fentanyl, and prescription opioids bind. The difference is timing and stability. Methadone has a long half-life (24 to 36 hours), so a once-daily dose produces a smooth, steady level in the blood instead of the peaks and crashes that drive craving and use.

At a stable dose, cravings quiet down and the reward from other opioids is blunted. People stop chasing a fix and start getting the rest of their life back. Methadone also blocks NMDA receptors to some degree, which is one theory for why it can be useful for pain that hasn't responded well to other opioids.

Receptor mechanism (detail)

Methadone is a full agonist at the µ-opioid receptor. Unlike buprenorphine (partial agonist, ceiling effect), methadone has no ceiling on its opioid effects, which is what makes it effective at higher doses but also what makes overdose possible. It's also an NMDA receptor antagonist and a modest reuptake inhibitor of serotonin and norepinephrine. The NMDA piece may reduce opioid tolerance and help with neuropathic pain, though the clinical size of that effect isn't settled.

Potency and typical dosing pattern

Ranges are typical framework only, not a prescription for any individual.

Induction usually starts at 20 to 30 mg on day one. Because of the long half-life, blood levels keep rising for several days at any given dose, so titration is slow. Increases of 5 to 10 mg every few days are typical until cravings and withdrawal are controlled without oversedation. A common effective range for OUD is 60 to 120 mg per day, though some people need less and some need more.

Steady state takes 5 to 7 days. That means the dose you take today doesn't show its full effect for close to a week, which is why rushing the titration is dangerous.

Safety monitoring

• Baseline and periodic ECG for QTc prolongation. Higher doses (usually over 100 mg) and certain co-prescribed drugs raise the risk.
• Respiratory status, especially at induction and any time the dose goes up, and any time a sedating medication is added.
• Urine drug screens per OTP protocol.
• Liver function and pregnancy status as clinically indicated.
• Sleep-disordered breathing screening in people with risk factors. Methadone can worsen central sleep apnea.
• Signs of oversedation at the start and after each dose change.

What to expect

The first week or two is the most delicate stretch. The goal is to reach a dose that stops withdrawal and cravings without making you feel sedated or sick. Because methadone accumulates over several days, sedation that starts mild on day two can be much stronger by day five at the same dose. That's why OTPs bring people in daily.

Once you're at a stable dose, methadone tends to feel like nothing in particular. People describe it as feeling normal for the first time in a long time. Cravings drop, sleep often improves, and other opioids stop working the way they used to.

Common side effects

Most people get some side effects. The common ones include:

• Constipation, often persistent.
• Sweating.
• Weight gain over time.
• Sedation, especially at the start.
• Low libido and other sexual side effects.
• Dry mouth and dental problems.
• Swelling in the legs.

Constipation and sweating tend to stick around and need to be managed rather than waited out.

Serious side effects and warnings

Boxed warning. Methadone carries an FDA boxed warning for life-threatening respiratory depression, especially during initiation and dose increases, and for QTc prolongation with risk of the arrhythmia torsades de pointes. Combining methadone with benzodiazepines, alcohol, or other CNS depressants can be fatal.

• Respiratory depression and overdose. Highest during the first two weeks and after any dose increase. Combining with benzodiazepines, alcohol, gabapentinoids, or sedating antihistamines multiplies the risk.
• QTc prolongation. Can cause torsades de pointes. Baseline ECG and periodic ECGs are standard, especially at higher doses.
• Neonatal opioid withdrawal syndrome if used during pregnancy. This is expected and managed, not a reason to stop methadone in pregnancy.
• Adrenal insufficiency with long-term use, rare but real.
• Serotonin syndrome if combined with strong serotonergic drugs.

Sexual and relational effects

Long-term full opioid agonists, including methadone, commonly lower testosterone in men and can affect menstrual cycles in women, which shows up as low libido, erectile dysfunction, and reduced energy. It's worth checking a morning testosterone level if these symptoms are present. On the relational side, being at a stable dose is often the first time in years that someone can show up for family, work, and relationships without an opioid emergency running the day. That's a real gain, even if the medication itself doesn't feel like anything.

Weight, appetite, and sleep

Weight gain is common on methadone, both from restored appetite after chaotic use and from the medication itself. Sleep can improve once cravings and withdrawal aren't waking you up, but methadone can worsen sleep apnea and sometimes cause restless sleep at higher doses.

Starting and dosing basics

This section is general background, not a dosing instruction for any individual. The right dose is a decision for a prescriber.

For opioid use disorder in the U.S., methadone is dispensed through Opioid Treatment Programs licensed by SAMHSA. That means daily observed dosing at first, with take-home doses earned over time based on stability, urine tox results, and program requirements. It's a system that some people find intrusive and others find grounding. Either way, it exists because the medication is high-risk during induction and needs close eyes on it.

Missed doses and interactions

If you miss a day or more, don't take a double dose. Tolerance drops fast. After three or more missed days, the program will usually restart at a lower dose.

Interactions are a big deal with methadone. Rifampin, phenytoin, carbamazepine, and some antiretrovirals speed up methadone metabolism and can trigger withdrawal at a previously stable dose. Fluvoxamine, ciprofloxacin, and some antifungals slow methadone metabolism and can push levels dangerously high. Combining methadone with benzodiazepines, alcohol, or other opioids sharply raises overdose risk. Every prescriber and pharmacist should have the full list of medications, including over-the-counter and herbal ones.

Stopping and tapering

Coming off methadone should be gradual and planned with the OTP or prescriber. Tapers are usually done in small steps (often 5 to 10 percent of the current dose every one to two weeks or slower), and even that pace can feel hard. Many people stay on methadone long-term because that's what keeps them alive and well, and there's no medical reason to force a taper.

Pregnancy and breastfeeding

Methadone in pregnancy is recommended over uncontrolled opioid use. Doses often need to go up in the second and third trimesters because of metabolism changes. Babies born to mothers on methadone can have neonatal opioid withdrawal syndrome, which is treated in the nursery and doesn't cause long-term harm on its own. Methadone passes into breast milk in small amounts and breastfeeding is generally encouraged.

Anyone who is pregnant, planning a pregnancy, or breastfeeding should talk it through with their prescriber so the specific risks and benefits can be weighed.

Cost and generic availability

Methadone as a medication is inexpensive and generic. The cost of care is mostly the OTP program itself, which many insurance plans and Medicaid cover. For pain use outside OTPs, methadone is prescribed and filled at regular pharmacies and is one of the cheapest long-acting opioids.

Common questions

Is methadone just replacing one addiction with another? No. Addiction is compulsive use despite harm. Methadone at a stable dose in a treatment program stops the compulsive use and the harm. It's a medication that treats a chronic illness, the same way insulin treats diabetes.

Why does it have to be given at a clinic? Because during induction the risk of overdose is real, and daily contact catches problems early. Over time, take-home doses are earned. Some people move to weekly or monthly pickups after they're stable.

How long do people stay on it? Often years, sometimes indefinitely. Stopping too early is the single biggest predictor of relapse. Many clinicians treat methadone the way we treat any long-term medication for a chronic condition.

Will it show up on a drug test? Standard urine drug tests don't usually flag methadone unless they specifically test for it. If you're tested for employment or probation, tell the tester you're in an OTP so the result is interpreted correctly.

Can I drink alcohol on it? No. The combination raises overdose risk sharply and destabilizes the treatment.

Questions to ask your prescriber

• What dose are we aiming for, and how long will it take to get there?
• When will I get my first ECG, and how often after that?
• What medications and supplements should I avoid while on this?
• What are the criteria for take-home doses at this program?
• If I ever want to come off, what would that plan look like?

Sources

This guide draws on current prescribing information and public health references. It is reviewed for clinical accuracy and updated as guidance changes, and current as of June 8, 2026.

• U.S. Food and Drug Administration. Methadone (Dolophine, Methadose) prescribing information.
• DailyMed, U.S. National Library of Medicine. Methadone hydrochloride label.
• MedlinePlus, U.S. National Library of Medicine. Methadone.
• Substance Abuse and Mental Health Services Administration. Medications for opioid use disorder and OTP regulations.
• American Society of Addiction Medicine. National Practice Guideline for the Treatment of Opioid Use Disorder.
• National Institute of Mental Health. Mental health medications.