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Methadose (Methadone Hydrochloride) - Summary


Deaths, cardiac and respiratory, have been reported during initiation and conversion of pain patients to methadone treatment from treatment with other opioid agonists. It is critical to understand the pharmacokinetics of methadone when converting patients from other opioids ( see DOSAGE AND ADMINISTRATION). Particular vigilance is necessary during treatment initiation, during conversion from one opioid to another, and during dose titration.

Respiratory depression is the chief hazard associated with methadone hydrochloride administration. Methadone's peak respiratory depressant effects typically occur later, and persist longer than its peak analgesic effects, particularly in the early dosing period. These characteristics can contribute to cases of iatrogenic overdose, particularly during treatment initiation and dose titration.

In addition, cases of QT interval prolongation and serious arrhythmia (torsades de pointes) have been observed during treatment with methadone. Most cases involve patients being treated for pain with large, multiple daily doses of methadone, although cases have been reported in patients receiving doses commonly used for maintenance treatment of opioid addiction.

Methadone treatment for analgesic therapy in patients with acute or chronic pain should only be initiated if the potential analgesic or palliative care benefit of treatment with methadone is considered and outweighs the risks.

Conditions for Distribution and Use of Methadone Products for the Treatment of Opioid Addiction

Code of Federal Regulations, Title 42, Sec 8

Methadone products when used for the treatment of opioid addiction in detoxification or maintenance programs, shall be dispensed only by opioid treatment programs (and agencies, practitioners or institutions by formal agreement with the program sponsor) certified by the Substance Abuse and Mental Health Services Administration and approved by the designated state authority. Certified treatment programs shall dispense and use methadone in oral form only and according to the treatment requirements stipulated in the Federal Opioid Treatment Standards (42 CFR 8.12). See below for important regulatory exceptions to the general requirement for certification to provide opioid agonist treatment.

Failure to abide by the requirements in these regulations may result in criminal prosecution, seizure of the drug supply, revocation of the program approval, and injunction precluding operation of the program.

Regulatory Exceptions to the General Requirement for Certification to Provide Opioid Agonist Treatment:

  1. During inpatient care, when the patient was admitted for any condition other than concurrent opioid addiction (pursuant to 21 CFR 1306.07(c)), to facilitate the treatment of the primary admitting diagnosis).
  2. During an emergency period of no longer than 3 days while definitive care for the addiction is being sought in an appropriately licensed facility (pursuant to 21 CFR 1306.07(b)).


5 mg, 10 mg

Methadose® Oral Concentrate (methadone hydrochloride USP) is supplied as a cherry flavored liquid concentrate. Methadose® Sugar-Free Oral Concentrate (methadone hydrochloride USP) is a dye-free, sugar-free, unflavored liquid concentrate of methadone hydrochloride. Each liquid concentrate contains 10 mg of methadone hydrochloride per mL. Methadone hydrochloride (3-heptanone, 6-(dimethylamino)-4, 4-diphenyl-, hydrochloride) is a white, essentially odorless, bitter-tasting crystalline powder. It is very soluble in water, soluble in isopropranolol and in chloroform, and practically insoluble in ether and in glycerine. It is present in Methadose as the racemic mixture. Methadone hydrochloride has a melting point of 235ºC, a pKa of 8.25 in water at 20°C, a solution (1 in 100) pH between 4.5 and 6.5, a partition coefficient of 117 at pH 7.

Methadose (Methadone) is indicated for the following:

  1. Detoxification treatment of opioid addiction (heroin or other morphine-like drugs).
  2. Maintenance treatment of opioid addiction (heroin or other morphine-like drugs), in conjunction with appropriate social and medical services.

See all Methadose indications & dosage >>


Published Studies Related to Methadose (Methadone)

Effectiveness of naltrexone in the prevention of delayed respiratory arrest in opioid-naive methadone-intoxicated patients. [2013]
Acute methadone toxicity is a major public health concern in Iran... Further studies are warranted before the generalization of this approach to other patient populations.

The effects of gabapentin on methadone based addiction treatment: a randomized controlled trial. [2013]
Gabapentin is a potentially useful drug in alleviating the hyperexcitatory painful states in the control of opiate dependence in acute detoxification and the stabilization phase. This study aim was to evaluate the effectiveness of gabapentin adds-on methadone therapy on lowering the methadone... This drug leads to relief of withdrawal symptoms and lower methadone consumption.

Effects of disulfiram on QTc interval in non-opioid-dependent and methadone-treated cocaine-dependent patients. [2013]
clinical trial of disulfiram were prospectively determined... CONCLUSIONS: These results suggest that cocaine use and possibly MT status, but

A randomized investigation of methadone doses at or over 100 mg/day, combined with contingency management. [2013]
provide such evidence... CONCLUSIONS: Under double-blind conditions, dosages of methadone over 100mg/day,

Tramadol versus methadone for treatment of opiate withdrawal: a double-blind, randomized, clinical trial. [2012]
The aim of this study was to compare the efficacy and safety of tramadol versus methadone for treatment of opiate withdrawal. Seventy patients randomly were assigned in two groups to receive either prescribed methadone (60 mg/day) or tramadol (600 mg/day)... Tramadol may be as effective as methadone in the control of withdrawal and could be considered as a potential substitute for methadone to manage opioids withdrawal.

more studies >>

Clinical Trials Related to Methadose (Methadone)

Methadone Pharmacokinetics and Cardiac Effects in Newborns [Recruiting]
The Primary objectives of this proposal are to determine the population kinetics for methadone and its enantiomers in preterm newborns and infants at 29 weeks to 48 weeks post menstrual age (PMA) who are 1 week old and older and establish any correlations of the kinetics with PMA to determine the bioavailability for enterally administered methadone in these newborns and young infants.

The secondary objectives of this proposal are to explore possible genotypic changes in CYP3A4-3A7-3A5, CYP2B6, CYP2C8, CYP2C19, and CYP2D6 and PGO on the kinetics of methadone in neonates and young infants and to test the safety of methadone in this population by correlating the plasma concentrations of the methadone enantiomers, S-methadone and R-methadone, with changes in cardiac repolarization by measurement of corrected QT, heart rate, and blood pressure.

Drug Interaction Study Of Filibuvir With Methadone, Among Subjects On Chronic Methadone Maintenance [Not yet recruiting]
Filibuvir, a CYP3A4 inhibitor is being developed for the treatment of chronic Hepatitis C infection. Given the likelihood of co administration of filibuvir and methadone, this study will evaluate the effect of filibuvir on the pharmacokinetics of R/S Methadone.

Methadone Maintenance & HIV Risk in Ukraine [Recruiting]
Treatment of opioid dependence is an important way to reduce the spread of HIV and other infectious diseases, particularly in Ukraine since intravenous opioid use is the major way these infections are being spread. This proposal will be done at the Kiev City Narcology Hospital and the City AIDS Center with collaborators from the University of Alabama and the University of Colorado. It will study the acceptability and impact of a 3-month course of methadone maintenance on 50 persons with opioid dependence, 25 who are HIV+ and 25 HIV-. The proposed work will build on a relationship that was established with the Ukrainian Co-Principal Investigator, Sergiy Dvoryak, M. D., during his Humphrey Fellowship at Johns Hopkins in 1999-2000 when he spent time with Dr. Woody and Metzger at the Penn Addiction and Treatment and Research Center. It will also extend studies of pharmacologic treatment for opioid dependence and risk reduction behavioral interventions that are being done by Drs. Woody, Schumacher and Booth in Russia and Ukraine. Primary aims are to: measure the acceptability and compliance with a 3-month course of methadone maintenance in HIV+ and HIV- patients; measure the impact of a 3-month course of methadone in reducing opioid use in HIV+ and HIV- patients; measure the impact of a 3-month course of methadone on reducing HIV risk behavior in HIV+_and HIV- patients. Secondary aims are to: assess the degree to which a 3-month course of methadone maintenance reduces illegal activities and improves employment and psychiatric symptoms; determine short-term outcome after completion of methadone treatment; and obtain pilot data on the prevalence of hepatitis B and C among study patients. This study will provide pilot data on the acceptability and efficacy of a short-term course of methadone maintenance on HIV+ and HIV- persons in a setting where this treatment has not been evaluated, on the feasibility of conducting the kind of work that is proposed, and will enhance research capabilities of Kiev investigators for future HIV prevention and treatment studies.

Variance of Oral Methadone Dosage: Description of Implicated Factors [Recruiting]
The purpose of this study is to describe clinical, pharmacokinetic and genetic factors associated with the variance of oral methadone dosage for patients at the steady state of heroin dependence maintenance treatment. The hypothesis is that the investigators can predict 70% of the variance with few factors, including CYP 3A4 function measured with oral midazolam challenge.

Methadone-Dolutegravir (DTG - GSK1349572) Drug Interaction Study. [Not yet recruiting]
Dolutegravir (DTG, GSK1349572) is an integrase inhibitor that is currently in Phase 3 clinical development for the treatment of HIV infection. As HIV-infected subjects may also be receiving methadone for opioid dependence, an evaluation of the potential interaction between DTG and methadone is warranted. The primary objective of this study is to determine whether concomitant administration of DTG can affect the pharmacokinetics (PK) of methadone. As a secondary endpoint, the PK of DTG will be compared to historical data. This study will be open-label with subjects receiving DTG and stable doses of methadone. The study will be conducted at one center in Canada in adult male and female subjects.

more trials >>

Reports of Suspected Methadose (Methadone) Side Effects

Drug Withdrawal Syndrome Neonatal (374)Foetal Exposure During Pregnancy (371)Maternal Exposure During Pregnancy (176)Premature Delivery (169)Premature Baby (84)Completed Suicide (25)Cardio-Respiratory Arrest (22)Nystagmus (22)Maternal Drugs Affecting Foetus (21)Strabismus (16)more >>

Page last updated: 2014-11-30

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