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

Methadone Martindale Pharma

Active Ingredient:
Methadone Hydrochloride
Origin:
EU

Methadone Martindale Pharma (Methadone Hydrochloride)

Methadone Hydrochloride, the active ingredient in Methadone Martindale, is an opioid analgesic presented as an oral formulation for oral use. It is employed in the management of opioid dependence and for the treatment of chronic pain in adult patients.

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

Manufacturer / TM Owner

Ethypharm

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Indications & Clinical Uses

Methadone is used in opioid‑related disorders and long‑term pain management.

  • Opioid dependence: stabilises patients, reduces withdrawal symptoms and supports abstinence.
  • Chronic pain: provides sustained analgesia for severe, persistent pain unresponsive to other opioids.
  • Opioid detoxification: facilitates a controlled tapering process during supervised withdrawal programs.

How It Works

  • Methadone acts as a full agonist at the mu‑opioid receptors, producing analgesia and suppressing withdrawal by mimicking endogenous opioids. It also blocks NMDA receptors, which may reduce opioid tolerance and hyperalgesia. The combined receptor activity results in prolonged pain relief and stabilization of opioid‑dependent patients.

Side Effects

Methadone may cause a range of adverse reactions, from mild to severe.

Common Side Effects

  • Constipation: reduced bowel motility leading to infrequent stools.
  • Nausea: feeling of queasiness, often transient.
  • Drowsiness: increased sleepiness or fatigue.
  • Dry mouth: reduced salivary flow.
  • Sweating: excessive perspiration.
  • Dizziness: light‑headed sensation, especially on standing.

Serious or Rare Side Effects

  • Respiratory depression: slowed breathing that can be life‑threatening.
  • Cardiac arrhythmia: abnormal heart rhythm, including QT prolongation.
  • Severe hypotension: marked drop in blood pressure.
  • Allergic reactions: rash, itching, or anaphylaxis.
  • Seizures: convulsive episodes.
  • Hepatotoxicity: liver enzyme elevations or liver injury.

Precautions & Warnings

Methadone requires careful monitoring due to its potency and risk profile.

  • Assess patient history: evaluate prior opioid use, respiratory conditions and cardiac disease.
  • Initiate low dose: start with the smallest effective dose and titrate slowly.
  • Monitor QT interval: obtain baseline ECG and repeat if clinically indicated.
  • Avoid abrupt discontinuation: taper gradually to prevent withdrawal.
  • Counsel on driving: advise patients not to operate machinery until they know how the drug affects them.
  • Store at ambient temperature: keep below 25 °C in the original container, protect from moisture and light.

Avoid Interactions

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

Major Interactions (Avoid)

  • CYP3A4 inhibitors (e.g., ketoconazole, erythromycin): may increase methadone plasma levels and risk of toxicity.
  • QT‑prolonging agents (e.g., haloperidol, quinidine): additive risk of cardiac arrhythmias.
  • CNS depressants (e.g., benzodiazepines, alcohol): potentiate respiratory depression.

Moderate Interactions (Monitor Closely)

  • CYP2B6 inducers (e.g., rifampicin, carbamazepine): may reduce methadone concentrations, leading to withdrawal.
  • Antidepressants (e.g., SSRIs): can affect methadone metabolism and QT interval.
  • Herbal supplements (e.g., St John’s wort): may alter hepatic enzyme activity and affect drug levels.

Frequently Asked Questions

Methadone Martindale, containing methadone hydrochloride, is used primarily to treat opioid dependence and to provide long‑acting analgesia for chronic, severe pain in adult patients. It helps stabilize individuals undergoing opioid substitution therapy and can be part of supervised detoxification programs.

Methadone works by binding to mu‑opioid receptors in the central nervous system, producing analgesia and reducing withdrawal symptoms. It also blocks NMDA receptors, which may limit the development of tolerance and lessen hyperalgesia, resulting in a more stable therapeutic effect over time.

The dose of Methadone Martindale is individualized and must be determined by a qualified prescriber based on the patient’s clinical condition, prior opioid exposure, and response to therapy. Physicians typically start with a low dose and adjust gradually to achieve the desired effect while minimizing adverse reactions.

Methadone is classified as Pregnancy Category C, indicating that risk cannot be ruled out. It may be used when the potential benefit justifies the potential risk to the fetus. Methadone does pass into breast milk, so breastfeeding decisions should be made in consultation with a healthcare professional.

To order Methadone Martindale, 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.

Methadone offers a long half‑life and strong mu‑opioid receptor activity, providing stable plasma levels that reduce cravings and withdrawal. Compared with buprenorphine, methadone has a higher risk of respiratory depression but may be more effective for patients with high opioid tolerance. Choice of therapy depends on individual patient factors and clinical judgment.

Methadone Martindale should be stored at ambient temperature, preferably below 25 °C. Keep the product in its original packaging, protect it from moisture and direct light, and ensure the container is tightly closed to maintain stability throughout its shelf life.

Methadone Martindale is administered orally, usually as a tablet or solution, according to the prescriber’s instructions. The dose may be taken once daily or divided into multiple doses, depending on the therapeutic goal and patient tolerance.

The most serious risks include respiratory depression, especially when combined with other CNS depressants, and cardiac arrhythmias such as QT‑interval prolongation. Patients should be monitored closely for signs of overdose, breathing difficulties, or abnormal heart rhythms, and appropriate emergency measures should be in place.

Methadone should be avoided in individuals with known hypersensitivity to methadone, uncontrolled severe respiratory disease, significant cardiac conduction abnormalities, or those taking contraindicated medications that could cause dangerous interactions. A thorough medical assessment is required before initiating therapy.

Published by

GNH India Pharmaceuticals Limited

Licensed pharmaceutical supplier

Last updated:

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