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

Metadon Martindale Pharmaceuticals

Active Ingredient:
Methadone Hydrochloride
Origin:
EU

Metadon Martindale Pharmaceuticals (Methadone Hydrochloride)

Methadone, the active ingredient in Metadon, is an opioid agonist presented as an oral formulation for systemic use. It is employed in the management of opioid dependence and chronic pain, providing substitution therapy and analgesia for adult patients under medical supervision.

GNH India supplies Metadon as a licensed, GDP‑compliant international pharmaceutical supplier serving hospitals, pharmacies and clinics worldwide. The company adheres to stringent quality standards and provides regulatory documentation for export to multiple regions. Customers benefit from reliable logistics and responsive technical support.

Manufacturer / TM Owner

Martindale Pharmaceuticals Ltd

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Indications & Clinical Uses

  • Methadone is used in opioid‑related pathways to treat dependence and pain.
  • Opioid dependence: stabilizes patients during withdrawal and supports long‑term maintenance therapy.
  • Chronic pain: provides potent analgesia for severe, refractory pain when other opioids are insufficient.
  • Opioid substitution therapy: replaces illicit opioids with a controlled, oral medication to reduce harm and improve compliance.

How It Works

  • Methadone acts as a full agonist at the µ‑opioid receptor, binding with high affinity to produce analgesic and euphoric effects while suppressing withdrawal symptoms. It also blocks NMDA receptors and inhibits serotonin reuptake, contributing to its efficacy in chronic pain and reducing opioid tolerance. The drug’s long half‑life provides stable plasma concentrations, allowing once‑daily dosing in maintenance programs.

Side Effects

Methadone may cause a range of adverse reactions, which are categorized by frequency.

Common Side Effects

  • Nausea
  • Constipation
  • Dizziness
  • Sweating

Serious or Rare Side Effects

  • Respiratory depression
  • QT interval prolongation
  • Seizures
  • Severe allergic reactions (e.g., anaphylaxis)

Precautions & Warnings

  • When prescribing methadone, several safety considerations are essential.
  • Dose titration: adjust gradually under medical supervision to avoid accumulation.
  • Pregnancy: Category C; weigh potential benefits against risks with a healthcare provider.
  • Breastfeeding: caution advised; monitor infant for sedation or respiratory effects.
  • Concomitant CNS depressants: increased risk of profound sedation and respiratory depression.
  • Risk of dependence: monitor for misuse and diversion.
  • Store at ambient temperature: keep in original container, protect from moisture and heat.

Avoid Interactions

Methadone interacts with several drug classes; awareness helps prevent adverse events.

Major Interactions (Avoid)

  • CYP3A4 inhibitors (e.g., ketoconazole): may raise methadone plasma levels and cause toxicity.
  • QT‑prolonging agents (e.g., haloperidol): increase risk of cardiac arrhythmias.
  • Respiratory depressants (e.g., benzodiazepines): additive suppression of breathing.

Moderate Interactions (Monitor Closely)

  • CYP3A4 inducers (e.g., rifampin): may lower methadone concentrations, reducing efficacy.
  • Antiretroviral drugs (e.g., efavirenz): can alter methadone metabolism, requiring dose adjustments.
  • Selective serotonin reuptake inhibitors (e.g., sertraline): may enhance central nervous system effects.

Frequently Asked Questions

Metadon contains methadone hydrochloride and is prescribed for opioid dependence management and for the relief of severe chronic pain. It is used in maintenance therapy to reduce withdrawal symptoms and to provide analgesia when other opioids are inadequate.

Methadone works by binding strongly to the µ‑opioid receptors in the central nervous system, acting as a full agonist. This activation reduces pain signals and suppresses the cravings and withdrawal associated with opioid dependence, while its long half‑life maintains steadier drug levels.

The appropriate dose of Metadon is individualized. A qualified prescriber determines the starting amount, titration schedule, and maintenance dose based on the patient’s clinical condition, prior opioid exposure, and response to therapy.

Methadone is classified as Pregnancy Category C, meaning risk cannot be ruled out. It may be used when the benefit outweighs potential harm, but careful monitoring is required. During breastfeeding, caution is advised because the drug can pass into milk and affect the infant.

To order Metadon, submit an enquiry on the 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.

The primary alternative for opioid dependence is buprenorphine, a partial µ‑opioid agonist. Methadone provides full agonism and a longer half‑life, which can offer more stable plasma levels but carries a higher risk of respiratory depression. Choice depends on patient history, treatment goals and clinician judgment.

Metadon should be stored at ambient temperature, below 25 °C, in its original packaging. Protect the product from moisture, direct sunlight and excessive heat to maintain potency. Keep out of reach of children and unauthorized personnel.

Metadon is administered orally. The tablet or capsule is swallowed whole with water, usually once daily for maintenance therapy, although dosing frequency may be adjusted by the prescriber based on therapeutic response and plasma levels.

The most serious risks include respiratory depression, especially when combined with other depressants, QT‑interval prolongation that can lead to cardiac arrhythmias, and the potential for overdose. Patients should be monitored closely for signs of severe sedation, breathing difficulties or cardiac symptoms.

Metadon is contraindicated in individuals with known hypersensitivity to methadone, severe respiratory depression, acute asthma attacks, or those taking monoamine oxidase inhibitors (MAOIs). Caution is also required for patients with significant cardiac disease, liver impairment, or a history of substance misuse.

Published by

GNH India Pharmaceuticals Limited

Licensed pharmaceutical supplier

Last updated:

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