Product image of Methotrexate Pfizer (Methotrexate) supplied by GNH India

Methotrexate Pfizer

Active Ingredient:
Methotrexate
Origin:
EU

Methotrexate Pfizer (Methotrexate)

Methotrexate, the active ingredient in Methotrexate Pfizer, is an antimetabolite (folate antagonist) presented as an injectable solution for intramuscular, intravenous or intrathecal use. It is employed to treat autoimmune disorders and certain malignancies in adult and pediatric patients.

GNH India supplies Methotrexate Pfizer as a licensed, GDP‑compliant international pharmaceutical supplier serving hospitals, oncology centres and pharmacies worldwide.

Manufacturer / TM Owner

Pfizer Aps

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Indications & Clinical Uses

Methotrexate acts on rapidly dividing cells and immune pathways, making it useful across several disease families.

  • Rheumatoid arthritis: reduces joint inflammation and slows disease progression.
  • Psoriasis: diminishes skin plaque formation and severity.
  • Acute lymphoblastic leukemia: interferes with leukemic cell proliferation.
  • Non‑Hodgkin lymphoma: contributes to tumor control in combination regimens.
  • Osteosarcoma: used as part of multi‑agent chemotherapy protocols.

How It Works

  • Methotrexate inhibits dihydrofolate reductase, preventing the conversion of dihydrofolate to tetrahydrofolate. This blockade reduces the synthesis of thymidine and purine nucleotides, impairing DNA, RNA and protein production in rapidly dividing cells and activated immune cells, thereby exerting antineoplastic and immunosuppressive effects.

Side Effects

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

Common Side Effects

  • Nausea or vomiting.
  • Fatigue or malaise.
  • Oral mucosal ulceration.
  • Transient elevation of liver enzymes.
  • Decreased white blood cell count.
  • Alopecia (hair thinning).

Serious or Rare Side Effects

  • Pulmonary toxicity (interstitial pneumonitis).
  • Severe hepatic injury or fibrosis.
  • Bone marrow failure leading to pancytopenia.
  • Life‑threatening infections.
  • Renal impairment or failure.
  • Severe cutaneous reactions such as Stevens‑Johnson syndrome.

Precautions & Warnings

Methotrexate requires careful monitoring and specific safety measures.

  • Pregnancy: contraindicated (Category X) – avoid use in women of childbearing potential.
  • Liver function: monitor enzymes regularly; adjust therapy if significant elevation occurs.
  • Hematology: perform complete blood counts before and during treatment to detect cytopenias.
  • Renal function: assess creatinine clearance; dose reduction may be needed in impairment.
  • Folic acid supplementation: recommended to reduce mucosal and hematologic toxicity.
  • Store at 2-8°C: keep refrigerated, protect from light, do not freeze or shake.

Avoid Interactions

Methotrexate interacts with several drug classes, influencing efficacy and toxicity.

Major Interactions (Avoid)

  • Non‑steroidal anti‑inflammatory drugs (NSAIDs): increase methotrexate toxicity.
  • Penicillins and other β‑lactam antibiotics: may raise serum levels.
  • Sulfonamide antibiotics: potentiate hematologic suppression.
  • Live vaccines: risk of severe infection due to immunosuppression.
  • Proton pump inhibitors: can reduce renal clearance.

Moderate Interactions (Monitor Closely)

  • Warfarin: enhanced anticoagulant effect, monitor INR.
  • Phenytoin: may lower methotrexate concentrations.
  • Trimethoprim‑sulfamethoxazole: additive bone‑marrow suppression.
  • Azathioprine: combined immunosuppression increases infection risk.
  • Alcohol: exacerbates hepatic toxicity.

Frequently Asked Questions

Methotrexate Pfizer is indicated for rheumatoid arthritis, severe plaque psoriasis, acute lymphoblastic leukemia, non‑Hodgkin lymphoma and osteosarcoma. In each case it works by inhibiting cell proliferation or modulating immune activity, helping to control disease activity and improve clinical outcomes.

Methotrexate blocks the enzyme dihydrofolate reductase, which is essential for producing tetrahydrofolate. This limits the synthesis of nucleotides needed for DNA, RNA and protein formation, thereby reducing the growth of rapidly dividing cells and dampening the immune response.

The dose of Methotrexate Pfizer is individualized by the prescribing clinician based on the specific indication, patient weight, renal function and treatment protocol. Healthcare providers determine the appropriate amount and schedule for each patient.

Methotrexate is classified as Pregnancy Category X, meaning it is contraindicated in pregnancy due to a high risk of fetal harm. It is also not recommended while breastfeeding because it can be excreted in milk and affect the infant.

To place an 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 (including cold‑chain if needed) and import documentation.

Compared with biologic agents, methotrexate is a small‑molecule antimetabolite that can be administered by injection and is generally less expensive. It has a well‑characterized safety profile but requires regular monitoring of liver and blood parameters, whereas many biologics have different monitoring needs and administration routes.

Methotrexate Pfizer should be stored refrigerated at 2‑8 °C. Keep the vials in their original packaging, protect them from light, and do not freeze or shake the solution. If a temporary temperature excursion occurs, consult the product label before use.

Methotrexate Pfizer is supplied as an injectable solution and can be given intramuscularly, intravenously or intrathecally, depending on the therapeutic indication and physician’s prescription. Administration is performed by qualified healthcare professionals in a clinical setting.

The most serious risks include severe liver toxicity, bone‑marrow suppression leading to pancytopenia, pulmonary fibrosis or pneumonitis, and renal failure. Patients should be monitored regularly for signs of these complications, and therapy should be discontinued if they occur.

Methotrexate Pfizer is contraindicated in pregnant women, individuals with severe liver disease, uncontrolled renal impairment, active infections, and those with known hypersensitivity to methotrexate or any component of the formulation. It should also be avoided in patients receiving live vaccines.

Published by

GNH India Pharmaceuticals Limited

Licensed pharmaceutical supplier

Last updated:

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