Product image of Methadone Ap-Hp (Methadone Hydrochloride) supplied by GNH India

Methadone Ap-Hp

Active Ingredient:
Methadone Hydrochloride
Origin:
EU

Methadone Ap-Hp (Methadone Hydrochloride)

Methadone, the active ingredient in Methadone Ap-Hp, is a synthetic opioid presented as an oral dosage form for oral use. It is employed in the treatment of opioid dependence, including maintenance therapy, and provides analgesia for severe chronic pain in adult patients.

GNH India supplies Methadone Ap-Hp as a licensed, GDP‑compliant international pharmaceutical supplier serving hospitals, pharmacies and clinics worldwide, adhering to EU quality standards and providing reliable global distribution. The company ensures batch consistency, regulatory compliance, and timely delivery to meet the needs of healthcare providers across multiple regions.

Manufacturer / TM Owner

Assistance Publique - Hopitaux De Paris - Ap-Hp

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Indications & Clinical Uses

Methadone is indicated for conditions involving opioid pathways where analgesia or withdrawal suppression is required.

  • Opioid dependence: maintenance therapy reduces withdrawal symptoms and cravings, supporting long‑term abstinence.
  • Severe chronic pain: provides effective analgesia for patients with persistent, high‑intensity pain unresponsive to other opioids.
  • Opioid detoxification: facilitates controlled tapering of opioid use during supervised withdrawal programs.

How It Works

  • Methadone acts as a full agonist at the μ‑opioid receptors in the central nervous system. By binding to these receptors, it mimics the effects of endogenous opioids, producing analgesia and suppressing the hyper‑activity of the opioid system that underlies withdrawal. Its long half‑life provides sustained receptor activation, allowing once‑daily dosing for maintenance therapy and steady pain control.

Side Effects

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

Common Side Effects

  • Nausea: mild to moderate stomach upset.
  • Constipation: reduced bowel motility.
  • Drowsiness: increased sleepiness.
  • Sweating: excessive perspiration.

Serious or Rare Side Effects

  • Respiratory depression: slowed breathing that can be life‑threatening.
  • Cardiac arrhythmia (QT prolongation): irregular heart rhythm.
  • Severe hypotension: marked drop in blood pressure.

Precautions & Warnings

When prescribing Methadone, clinicians should consider several safety precautions to minimize risk.

  • Assess patient history: evaluate prior opioid use, tolerance, and comorbid conditions.
  • Monitor respiratory function: watch for signs of depression, especially during dose initiation.
  • Check cardiac status: obtain baseline ECG to assess QT interval.
  • Avoid abrupt discontinuation: taper dose gradually to prevent withdrawal.
  • Counsel on CNS depressants: limit concurrent use of alcohol, benzodiazepines, or other sedatives.
  • Store at ambient temperature: keep below 25 °C in the original container, protect from moisture and light.

Avoid Interactions

Methadone interacts with several medicines; awareness of these interactions helps prevent adverse events.

Major Interactions (Avoid)

  • CYP3A4 inhibitors (e.g., ketoconazole, erythromycin): can increase methadone plasma levels, risking toxicity.
  • QT‑prolonging agents (e.g., haloperidol, sotalol): may exacerbate cardiac arrhythmia risk.
  • CNS depressants (e.g., benzodiazepines, barbiturates): heighten respiratory depression.

Moderate Interactions (Monitor Closely)

  • CYP3A4 inducers (e.g., rifampin, carbamazepine): may reduce methadone effectiveness.
  • Antidepressants (e.g., SSRIs, SNRIs): can affect methadone metabolism and serotonin levels.
  • Antiretrovirals (e.g., efavirenz): may alter methadone concentrations.

Frequently Asked Questions

Methadone Ap-Hp is used as an opioid agonist to treat opioid dependence through maintenance therapy and to provide analgesia for severe chronic pain when other opioids are insufficient. It helps reduce withdrawal symptoms, cravings, and offers long‑lasting pain relief in adult patients.

Methadone works by binding as a full agonist to the μ‑opioid receptors in the brain and spinal cord. This activation mimics natural endorphins, producing analgesia and suppressing the neural pathways that cause opioid withdrawal, while its long half‑life allows stable plasma concentrations.

The dose of methadone is individualized and determined by the prescribing clinician based on the patient’s opioid tolerance, clinical condition, and response to therapy. Dosing may be adjusted during treatment to achieve optimal control of pain or withdrawal symptoms.

Data on methadone use in pregnancy and lactation are limited. It may be prescribed when the benefits to the mother outweigh potential risks to the fetus or infant. Healthcare providers should discuss potential effects and monitor both mother and child closely.

To order, 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 and buprenorphine are the primary opioid agonist therapies for dependence. Methadone is a full μ‑opioid receptor agonist with a longer half‑life, allowing once‑daily dosing, while buprenorphine is a partial agonist with a ceiling effect on respiratory depression, which may offer a different safety profile.

Store Methadone Ap-Hp at ambient temperature, preferably below 25 °C, in its original packaging. Protect it from moisture, direct sunlight, and accidental ingestion. Keep the product out of reach of children and handle according to standard pharmacy safety procedures.

Methadone Ap-Hp is administered orally. The tablet (or oral formulation) should be swallowed whole with a full glass of water. Doses are taken as prescribed, typically once daily for maintenance therapy, but the exact schedule is determined by the treating clinician.

The most serious risks include respiratory depression, especially during dose initiation or when combined with other CNS depressants, and cardiac arrhythmias due to QT‑interval prolongation. Patients should be educated to seek immediate medical attention if they experience shallow breathing, severe dizziness, or palpitations.

Methadone should be avoided in individuals with known hypersensitivity to methadone, uncontrolled severe respiratory disease, significant cardiac conduction abnormalities (e.g., prolonged QT interval), or those taking contraindicated medications that could cause dangerous interactions. A thorough medical assessment is required before initiation.

Published by

GNH India Pharmaceuticals Limited

Licensed pharmaceutical supplier

Last updated:

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