Product image of Metadon (Methadone Hydrochloride) supplied by GNH India

Metadon

Active Ingredient:
Methadone Hydrochloride
Origin:
EU

Metadon (Methadone Hydrochloride)

Methadone, the active ingredient in Metadon, is an opioid agonist presented as a tablet for oral use. It treats opioid dependence and chronic pain in adult patients, helping to suppress withdrawal symptoms and provide long‑term analgesia.

GNH India supplies Metadon as a licensed, GDP‑compliant international pharmaceutical supplier serving hospitals, pharmacies and clinics worldwide.

Manufacturer / TM Owner

2care4 Generics Aps

1
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Indications & Clinical Uses

Metadon is an opioid agonist used in the management of conditions related to opioid use and pain control.

  • Opioid dependence: suppresses withdrawal symptoms and supports maintenance therapy.
  • Chronic pain: provides sustained analgesia for long‑term pain management.
  • Opioid substitution therapy: replaces more harmful opioids with a controlled, longer‑acting agent.

How It Works

  • Methadone acts as a full agonist at the mu‑opioid receptors in the central nervous system, producing analgesia and reducing the perception of pain. By occupying these receptors, it also diminishes cravings and withdrawal symptoms in individuals with opioid dependence, while its long half‑life provides stable plasma concentrations that help maintain therapeutic effect.

Side Effects

Methadon may cause a range of adverse reactions, some of which are common and others that are serious or rare.

Common Side Effects

  • Nausea
  • Constipation
  • Drowsiness
  • Sweating
  • Dry mouth
  • Headache

Serious or Rare Side Effects

  • Respiratory depression
  • QT interval prolongation
  • Severe hypotension
  • Seizures
  • Allergic reactions such as rash or angioedema
  • Adrenal insufficiency

Precautions & Warnings

When prescribing Metadon, clinicians should consider several safety measures.

  • Cardiac assessment: evaluate QT prolongation risk before initiation.
  • Respiratory monitoring: observe for signs of respiratory depression, especially during dose adjustments.
  • Liver function: check hepatic status as metabolism occurs primarily in the liver.
  • Renal function: adjust dosing in severe renal impairment.
  • Discontinuation: avoid abrupt cessation to prevent precipitated withdrawal.
  • Store at ambient temperature: keep in the original container, protect from moisture and direct sunlight.

Avoid Interactions

Methadone interacts with several drug classes that may alter its safety or efficacy.

Major Interactions (Avoid)

  • Central nervous system depressants (e.g., benzodiazepines): increased risk of respiratory depression.
  • Monoamine oxidase inhibitors: risk of serotonin syndrome.
  • Strong CYP3A4 inhibitors (e.g., ketoconazole): may raise methadone plasma levels.

Moderate Interactions (Monitor Closely)

  • CYP3A4 inducers (e.g., rifampicin): may reduce methadone concentrations.
  • Selective serotonin reuptake inhibitors: potential for additive serotonergic effects.
  • Antihistamines: may enhance sedation and drowsiness.

Frequently Asked Questions

Metadon contains methadone hydrochloride and is used primarily for the treatment of opioid dependence and for managing chronic pain. It helps suppress withdrawal symptoms in individuals undergoing opioid substitution therapy and provides long‑acting analgesia for persistent pain conditions.

Methadone works by binding to mu‑opioid receptors in the brain and spinal cord, acting as a full agonist. This activation reduces the perception of pain and diminishes cravings and withdrawal symptoms in people with opioid use disorder, while its long half‑life maintains steady drug levels.

The appropriate dose of Metadon is individualized and must be determined by a qualified prescriber based on the patient’s clinical condition, prior opioid exposure, and response to therapy. Dosage adjustments are made under medical supervision to achieve optimal therapeutic effect while minimizing adverse reactions.

Safety of methadone during pregnancy and lactation should be evaluated by the treating physician. While methadone is sometimes used in pregnancy to reduce illicit opioid use, potential risks to the fetus and infant exist, and a risk‑benefit assessment is essential before continuation.

To place an order, submit an enquiry on the Metadon product page at gnhindia.com, specifying the required quantity. GNH India works with hospitals, pharmacies, and procurement teams worldwide, verifies trade or institutional credentials, and then provides pricing, availability, shipping details, and any necessary import documentation.

Compared with shorter‑acting opioids such as morphine, methadone has a longer half‑life, allowing once‑daily dosing for maintenance therapy. It also possesses NMDA‑receptor antagonism, which may reduce tolerance development. However, it requires careful cardiac monitoring due to QT‑prolongation risk, a consideration less prominent with some alternatives.

Metadon should be stored at ambient temperature, preferably below 25 °C. Keep the product in its original packaging, protect it from moisture, and store it away from direct sunlight or heat sources to maintain potency and stability.

Metadon is administered orally, typically as a tablet. The exact dosing schedule and administration instructions are provided by the prescribing clinician, who may adjust the regimen based on therapeutic response and tolerability.

The most serious risks include respiratory depression, especially when combined with other central nervous system depressants, and cardiac arrhythmias due to QT interval prolongation. Patients should be monitored for signs of severe sedation, breathing difficulties, or irregular heart rhythms.

Metadon is contraindicated in individuals with known hypersensitivity to methadone, those taking monoamine oxidase inhibitors, or patients with severe uncontrolled cardiac arrhythmias. Caution is also advised for patients with significant respiratory, hepatic, or renal impairment, and it should be avoided in unmonitored opioid‑naïve individuals.

Published by

GNH India Pharmaceuticals Limited

Licensed pharmaceutical supplier

Last updated:

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