Methadone Martindale Pharmaceuticals (Methadone Hydrochloride)

Methadone works primarily as a full agonist at the μ‑opioid receptor, producing analgesic and anti‑withdrawal effects. It also blocks NMDA receptors and inhibits the reuptake of serotonin and norepinephrine, which contributes to its effectiveness in chronic pain and opioid dependence treatment.

The dose of methadone is individualized and set by the prescribing clinician based on the patient’s condition, prior opioid exposure, and response to therapy. Dosage adjustments are made according to clinical response and tolerability, and the prescriber determines the appropriate regimen.

Methadone is classified as Pregnancy Category C, indicating that risk cannot be ruled out. It may be used when the benefit outweighs potential risks, but careful monitoring is required. Methadone does pass into breast milk; therefore, clinicians should weigh the benefits of treatment against possible effects on the infant.

To place an order, submit an enquiry on the product page at gnhindia.com, specifying the required quantity. GNH India supplies hospitals, pharmacies and procurement teams worldwide, and will request verification of trade or institutional credentials. After confirmation, the team provides pricing, availability, shipping details (including cold‑chain if required) and assists with import documentation.

Methadone has a long half‑life and strong μ‑opioid receptor activity, allowing once‑daily dosing for maintenance therapy, unlike many short‑acting opioids. It also possesses NMDA antagonism and serotonin‑norepinephrine reuptake inhibition, which can benefit neuropathic pain. However, it requires careful cardiac monitoring for QT prolongation, a consideration less prominent with many other opioids.

Methadone Martindale should be stored at 2‑8 °C in a refrigerator, protected from light, and must not be frozen or shaken. Keep the product in its original packaging to maintain stability and prevent contamination.

Methadone is administered by intramuscular, intravenous, or subcutaneous injection. The route and injection site are selected by the healthcare professional based on clinical need, and the preparation is given using aseptic technique in a controlled setting.

The most serious risks include respiratory depression, which can be fatal, and cardiac arrhythmias due to QT interval prolongation. Other critical concerns are severe hypotension, adrenal insufficiency, serotonin syndrome when combined with serotonergic drugs, and rare allergic reactions such as anaphylaxis.

Methadone should be avoided in patients with uncontrolled severe respiratory disease, known hypersensitivity to methadone, significant baseline QT prolongation, or those taking contraindicated medications that may cause life‑threatening interactions. Caution is also advised for individuals with severe hepatic impairment or uncontrolled cardiac conditions.