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Medical Disclaimer: This information is for educational purposes only and is not a substitute for professional medical advice.
Brand Name
Methadone Hydrocloride
Generic Name
Methadone Hydrochloride
Active Ingredient
MethadoneCategory
Other
Salt Form
Hydrochloride
Variants
5
Different strengths and dosage forms
| Strength | Form | Route | NDC |
|---|---|---|---|
| 10 mg/mL | CONCENTRATE | ORAL | 63629-2098 |
| 10 mg/mL | CONCENTRATE | ORAL | 0527-1927 |
| 10 mg/mL | CONCENTRATE | ORAL | 72162-1085 |
References used for this content
This page is for informational purposes only and does not replace medical advice. Before using any prescription or over-the-counter medication for Methadone Hydrocloride, you must consult a qualified healthcare professional.
| 10 mg/mL | CONCENTRATE | ORAL | 17856-1927 |
| 10 mg/mL | CONCENTRATE | ORAL | 0527-1926 |
Detailed information about Methadone Hydrocloride
Methadone is a long-acting synthetic opioid agonist used for chronic pain management and opioid use disorder (OUD) detoxification. It works by altering the brain's response to pain and reducing withdrawal symptoms.
Dosage for methadone must be highly individualized, as the 'correct' dose varies significantly based on the patient's opioid tolerance, body chemistry, and the condition being treated.
In patients who are not opioid-tolerant, the typical starting dose is 2.5 mg every 8 to 12 hours. For patients switching from other opioids, a complex conversion calculation is required. Because methadone is much more potent than it appears on standard conversion charts, healthcare providers usually start with a dose that is 50% to 75% lower than the calculated equianalgesic dose. Dose increases should occur no more frequently than every 3 to 5 days to allow the drug to reach a steady state.
Methadone is generally not recommended for use in pediatric patients for the treatment of pain or OUD. Safety and effectiveness in children under the age of 18 have not been established. In rare cases where it is used for neonatal abstinence syndrome, it is administered in a neonatal intensive care unit (NICU) under extreme caution.
In patients with kidney disease, methadone should be used with caution. While methadone is primarily metabolized by the liver, its metabolites and a small portion of the unchanged drug are excreted by the kidneys. A lower starting dose and slower titration are typically recommended for patients with a GFR (Glomerular Filtration Rate) below 10 mL/min.
Since the liver is the primary site of metabolism, patients with significant liver dysfunction (e.g., cirrhosis) may experience higher blood levels of methadone. Healthcare providers will monitor these patients closely for signs of over-sedation and may reduce the frequency or amount of the dose.
Older adults are more sensitive to the effects of opioids and are at a higher risk for respiratory depression and falls. Providers typically 'start low and go slow,' often beginning at the lowest possible dose and monitoring for cognitive impairment or constipation.
If you miss a dose, take it as soon as you remember. However, if it is almost time for your next dose, skip the missed dose and return to your regular schedule. Never double the dose to catch up, as this significantly increases the risk of fatal respiratory depression.
An overdose of methadone is a medical emergency. Signs include:
If an overdose is suspected, call 911 immediately. If naloxone (Narcan) is available, it should be administered, but remember that methadone lasts much longer than naloxone, so multiple doses of naloxone and hospital observation are usually required.
> Important: Follow your healthcare provider's dosing instructions exactly. Do not adjust your dose without medical guidance, as even small changes can have life-threatening consequences.
Most patients taking methadone will experience some side effects, particularly during the initiation and titration phases. Common effects include:
Methadone is a high-risk medication that requires strict adherence to safety protocols. It should only be used by the person for whom it was prescribed. Sharing methadone is illegal and dangerous. Patients should be aware that the effects of methadone can last much longer than the pain-relieving effects, leading to a risk of 'stacking' doses and accidental overdose.
As noted in the side effects section, the FDA requires a Black Box Warning for methadone due to the risks of:
Methadone must NEVER be used in the following circumstances:
Methadone is considered the 'gold standard' for treating opioid use disorder during pregnancy. According to the American College of Obstetricians and Gynecologists (ACOG), maintenance therapy with methadone is preferred over supervised withdrawal, which is associated with high relapse rates and fetal stress.
Methadone is excreted into breast milk in small amounts. For women on stable maintenance doses, breastfeeding is generally encouraged by the WHO and AAP, as the benefits of breastfeeding usually outweigh the risks. However, the infant must be monitored closely for increased sleepiness, difficulty breathing, or poor weight gain. If a mother decides to stop breastfeeding, the infant should be tapered off slowly to avoid withdrawal.
Methadone is a synthetic opioid that primarily acts as an agonist at the mu-opioid receptor. By binding to these receptors in the brain and spinal cord, it inhibits ascending pain pathways and alters the perception of and emotional response to pain.
Additionally, methadone is an antagonist at the N-methyl-D-aspartate (NMDA) receptor. This is a unique feature among common opioids. NMDA antagonism is thought to play a role in reducing neuropathic pain and may help mitigate the development of opioid tolerance. Methadone also inhibits the reuptake of serotonin and norepinephrine in the CNS, similar to certain antidepressants, which may contribute to its analgesic effects in complex pain syndromes.
Common questions about Methadone Hydrocloride
Methadone is primarily used for two distinct medical purposes: the management of severe, chronic pain and the treatment of opioid use disorder (OUD). In pain management, it is reserved for patients who require around-the-clock opioid therapy when other treatments are insufficient. In the context of OUD, it is used during detoxification and long-term maintenance to reduce withdrawal symptoms and cravings for illicit opioids like heroin. Because it is long-acting, it helps stabilize the brain's chemistry, allowing individuals to focus on recovery and counseling. Its use for addiction is strictly regulated and typically occurs through certified Opioid Treatment Programs (OTPs).
The most common side effects of methadone include constipation, increased sweating, drowsiness, and dizziness. Many patients also experience nausea or vomiting, especially when they first start the medication or when the dose is increased. Because opioids slow down the digestive system, constipation is a very frequent and often persistent issue that may require dietary changes or medical management. Drowsiness and lightheadedness are most common shortly after taking a dose. While many of these effects may lessen over time as the body adjusts, they should always be discussed with a healthcare provider.
No, you should strictly avoid alcohol while taking methadone. Both alcohol and methadone are central nervous system depressants, meaning they slow down brain activity and breathing. Combining them can lead to a dangerous 'synergistic effect,' where the risk of fatal respiratory depression, profound sedation, and coma is significantly increased. Even small amounts of alcohol can be dangerous when mixed with a long-acting opioid like methadone. If you have a history of alcohol use, it is vital to discuss this with your doctor before starting treatment.
Methadone is often considered the standard of care for pregnant women with opioid use disorder because it prevents the cycle of withdrawal, which can be harmful to the fetus. While methadone does cross the placenta and can lead to Neonatal Opioid Withdrawal Syndrome (NOWS) after birth, this condition is manageable in a hospital setting. The risks of untreated opioid addiction during pregnancy, such as preterm labor and fetal death, are generally considered much higher than the risks of methadone maintenance. Pregnant women on methadone require close monitoring and may need dose adjustments as their pregnancy progresses.
For pain relief, methadone typically begins to work within 30 to 60 minutes after an oral dose, with peak effects occurring between 2 and 4 hours. However, because methadone builds up in the body's tissues, it takes about 3 to 5 days of consistent dosing to reach a 'steady state' where the full therapeutic effect is felt. In the treatment of addiction, a single dose can suppress withdrawal symptoms for 24 to 36 hours. Patients should be patient during the 'induction' phase and never take extra doses, as the drug's long half-life means it is still working even if the immediate 'feeling' of the drug fades.
No, you should never stop taking methadone suddenly. Because it is a potent opioid, your body develops a physical dependence on it over time. Stopping 'cold turkey' will trigger a severe withdrawal syndrome characterized by muscle aches, diarrhea, nausea, anxiety, insomnia, and intense drug cravings. While methadone withdrawal is rarely life-threatening for healthy adults, it is extremely uncomfortable and can lead to relapse in those being treated for addiction. If you wish to stop methadone, your healthcare provider will create a gradual tapering plan to slowly lower your dose over several weeks or months.
If you miss a dose of methadone, take it as soon as you remember. If it is nearly time for your next scheduled dose, skip the missed dose entirely and continue with your regular routine. It is critical that you never take a double dose to make up for a missed one, as this can lead to a dangerous accumulation of the drug in your system and increase the risk of overdose. If you are in a methadone clinic program and miss a dose, you must follow the specific protocols of your clinic, which may involve seeing a nurse or doctor before your next dose is dispensed.
Some patients do report weight gain while taking methadone, though it is not a direct side effect for everyone. Weight gain can occur for several reasons, including a slowed metabolism, increased cravings for sugar (common with opioids), and improved overall health and appetite once a person is stabilized from illicit drug use. Additionally, methadone can cause water retention in some individuals. Maintaining a balanced diet and regular exercise can help manage weight while on methadone. If weight gain becomes a significant concern, you should discuss it with your healthcare provider to rule out other hormonal issues.
Methadone has a very high potential for drug interactions because it is processed by several liver enzymes (CYP450 system). Many medications, including certain antibiotics, antifungals, antidepressants, and HIV medications, can either raise or lower the levels of methadone in your blood. Raising the levels increases the risk of overdose, while lowering them can cause withdrawal. Most importantly, methadone should not be combined with benzodiazepines or other sedatives unless under strict medical supervision. Always provide your doctor with a complete list of all prescriptions, over-the-counter drugs, and herbal supplements you are taking.
Yes, methadone hydrochloride is available as a generic medication in several forms, including oral tablets and oral solutions. Generic versions are bioequivalent to brand-name versions like Dolophine or Methadose, meaning they contain the same active ingredient and work the same way in the body. Generic methadone is typically more affordable and is covered by most insurance plans, including Medicaid and Medicare. Whether you receive the brand-name or generic version, the safety precautions and dosing requirements remain exactly the same.
Other drugs with the same active ingredient (Methadone)
> Warning: Stop taking Methadone and call your doctor immediately if you experience any of these.
Prolonged use of methadone can lead to several chronic health considerations:
The FDA has issued several 'Black Box' warnings for methadone, the highest level of caution:
Report any unusual symptoms to your healthcare provider immediately to ensure your treatment plan remains safe and effective.
While rare, anaphylaxis can occur. Patients with a known hypersensitivity to methadone hydrochloride or any components of the formulation must not use the drug.
Methadone can inhibit the hERG potassium channel in the heart, which delays repolarization and lengthens the QT interval on an EKG. This increases the risk of ventricular arrhythmias. Patients with a history of heart disease, electrolyte imbalances (low potassium or magnesium), or those taking other QT-prolonging drugs are at higher risk.
Methadone should be used with extreme caution in patients with chronic obstructive pulmonary disease (COPD), sleep apnea, or any condition that reduces respiratory reserve. It can further suppress the drive to breathe.
Opioids can increase the pressure of the fluid in the brain (intracranial pressure) and may obscure the clinical course of a patient with a head injury by causing sedation and pupil changes.
Healthcare providers will typically require the following monitoring:
Methadone can significantly impair the mental and physical abilities required for driving or operating heavy machinery. This is especially true during the first few weeks of treatment or after a dose increase. Do not drive until you know how methadone affects you and your doctor confirms it is safe.
Do not drink alcohol while taking methadone. Alcohol acts as a central nervous system depressant and can synergize with methadone to cause fatal respiratory depression, extreme sedation, and coma.
Stopping methadone suddenly (cold turkey) can lead to severe withdrawal symptoms, including muscle aches, diarrhea, vomiting, anxiety, and intense drug cravings. If you need to stop taking methadone, your doctor will provide a gradual tapering schedule to safely reduce the dose over weeks or months.
> Important: Discuss all your medical conditions, especially heart or lung problems, with your healthcare provider before starting Methadone.
Drugs that inhibit the enzymes that break down methadone can cause methadone levels to rise to dangerous levels. Examples include:
Drugs that speed up the metabolism of methadone can cause levels to drop, potentially leading to withdrawal symptoms. Examples include:
Methadone may interfere with certain urine drug screens, sometimes causing false positives for other opioids, or requiring specific 'methadone-only' tests for accurate detection. It can also cause transient elevations in liver enzymes (ALT/AST) and amylase/lipase levels.
For each interaction, the primary management strategy is close clinical monitoring and dose adjustment. If an inhibitor is added, the methadone dose may need to be lowered; if an inducer is added, the dose may need to be increased.
> Important: Tell your doctor about ALL medications, supplements, and herbal products you are taking, including over-the-counter cough and cold medicines.
Conditions requiring a careful risk-benefit analysis by a specialist include:
While methadone is chemically distinct from morphine-based opioids (phenanthrenes), patients who have had severe anaphylactic reactions to other opioids should be monitored closely, though cross-reactivity is statistically low.
> Important: Your healthcare provider will evaluate your complete medical history, including any history of substance use disorder or cardiac issues, before prescribing Methadone.
Methadone is not FDA-approved for use in children under 18. Its use in this population is limited to specialized pediatric palliative care or neonatal abstinence syndrome treatment under the direction of a specialist. There are significant concerns regarding its effect on the developing brain and the high risk of accidental overdose.
Patients over age 65 are at a significantly higher risk for methadone-related complications. Age-related declines in liver and kidney function can lead to higher blood levels. Furthermore, the elderly are more prone to the respiratory-depressant effects and the risk of falls due to sedation and dizziness. Polypharmacy (taking multiple medications) in the elderly also increases the risk of dangerous drug interactions.
While not the primary route of elimination, renal failure can affect the clearance of methadone and its metabolites. For patients with a GFR < 10 mL/min, providers may reduce the dose by 50% and monitor closely. Methadone is not significantly removed by hemodialysis, so 'catch-up' doses after dialysis are not necessary.
In patients with mild to moderate hepatic impairment, dose adjustments may not be necessary initially, but slow titration is essential. In severe hepatic impairment (Child-Pugh Class C), methadone should be used with extreme caution as the half-life can be significantly prolonged, leading to rapid accumulation and toxicity.
> Important: Special populations require individualized medical assessment and more frequent monitoring by their clinical team.
| Parameter | Value |
|---|---|
| Bioavailability | 40% - 99% (Oral) |
| Protein Binding | 85% - 90% (Alpha-1-acid glycoprotein) |
| Half-life | 8 - 59 hours (Average 24 hours) |
| Tmax | 1 - 7.5 hours |
| Metabolism | Hepatic (CYP3A4, 2B6, 2C19) |
| Excretion | Renal (20-50%), Fecal (10-40%) |
Methadone is classified as a Synthetic Opioid Agonist. It belongs to the phenylpropylamine derivatives class. Related medications include buprenorphine (a partial agonist) and morphine (a natural opiate), though methadone's long-acting nature and NMDA activity make it unique within this therapeutic area.