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 a pharmaceutical preparation for intra‑arterial, intramuscular, and intrathecal administration. It is employed in the management of rheumatoid arthritis, severe psoriasis, acute lymphoblastic leukemia, osteosarcoma, and gestational trophoblastic disease across adult and pediatric patient groups. It is used under specialist supervision to optimise therapeutic outcomes while monitoring toxicity.

GNH India supplies Methotrexate Pfizer as a licensed, GDP‑compliant international pharmaceutical supplier serving hospitals, oncology centres, pharmacies, and clinics worldwide, adhering to rigorous quality‑assurance standards.

Manufacturer / TM Owner

Pfizer Hellas A.E.

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Indications & Clinical Uses

Methotrexate is an antimetabolite used to modulate immune activity and inhibit malignant cell proliferation.

  • Rheumatoid arthritis: reduces joint inflammation and slows disease progression.
  • Psoriasis: decreases skin cell turnover and plaque formation.
  • Acute lymphoblastic leukemia: interferes with leukemic cell DNA synthesis.
  • Osteosarcoma: limits tumor growth by blocking folate pathways.
  • Gestational trophoblastic disease: induces remission by targeting proliferative trophoblastic tissue.

How It Works

  • Methotrexate inhibits the enzyme dihydrofolate reductase, preventing the conversion of dihydrofolate to tetrahydrofolate. This reduction in tetrahydrofolate limits the synthesis of purine and pyrimidine nucleotides, thereby impairing DNA, RNA, and protein production. The resulting antiproliferative effect curtails rapidly dividing cells, including immune cells and malignant tumor cells, leading to immunosuppression and antineoplastic activity.

Side Effects

Methotrexate can cause a range of adverse reactions that vary in frequency and severity.

Common Side Effects

  • Nausea and vomiting.
  • Fatigue or malaise.
  • Oral mucosal ulceration (mouth sores).
  • Elevated liver enzymes.
  • Mild to moderate cytopenias (low blood counts).

Serious or Rare Side Effects

  • Severe hepatotoxicity or liver fibrosis.
  • Pulmonary fibrosis or interstitial pneumonitis.
  • Life‑threatening infections due to immunosuppression.
  • Bone marrow failure or aplastic anemia.
  • Acute renal impairment.

Precautions & Warnings

When prescribing or handling Methotrexate, several safety considerations are essential.

  • Pregnancy: contraindicated (Category X); avoid use in pregnant patients.
  • Renal function: assess baseline and monitor; adjust or discontinue if renal impairment worsens.
  • Liver function: regularly check hepatic enzymes; discontinue if significant toxicity occurs.
  • Hematologic monitoring: perform frequent blood counts to detect cytopenias early.
  • Concomitant NSAIDs: use with caution as they may increase methotrexate toxicity.
  • Store at 2-8°C: keep refrigerated, protect from light, do not freeze or shake.

Avoid Interactions

Methotrexate interacts with several medicines that can alter its efficacy or safety.

Major Interactions (Avoid)

  • Live vaccines: avoid due to heightened infection risk.
  • Trimethoprim‑sulfamethoxazole: may cause severe myelosuppression.
  • NSAIDs: can increase methotrexate toxicity.

Moderate Interactions (Monitor Closely)

  • Azathioprine: monitor for additive immunosuppression.
  • Alcohol: limit intake to reduce liver injury risk.

Frequently Asked Questions

Methotrexate Pfizer is indicated for rheumatoid arthritis, severe psoriasis, acute lymphoblastic leukemia, osteosarcoma, and gestational trophoblastic disease. In each case, the drug works by inhibiting cell proliferation and modulating immune responses, helping to control disease activity and improve clinical outcomes under specialist supervision.

Methotrexate blocks the enzyme dihydrofolate reductase, which is essential for producing tetrahydrofolate, a key cofactor in nucleotide synthesis. By limiting DNA, RNA, and protein production, it suppresses rapidly dividing cells such as immune cells and cancer cells, providing both anti‑inflammatory and antineoplastic effects.

The dosage of Methotrexate Pfizer is individualized by the prescribing clinician based on the specific indication, patient weight, renal and hepatic function, and treatment response. Only a qualified healthcare professional should determine the appropriate dose and administration schedule.

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

To request Methotrexate Pfizer, 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.

Methotrexate is often considered a first‑line disease‑modifying antirheumatic drug (DMARD) because of its proven efficacy, oral or injectable options, and cost‑effectiveness. Compared with biologic agents, it has a broader safety profile but may require more laboratory monitoring for liver and blood‑cell effects.

Methotrexate Pfizer should be stored at 2‑8 °C in a refrigerator, protected from light, and kept in its original packaging. Do not freeze or shake the product, and ensure the temperature remains stable throughout storage and transport.

Methotrexate can be given via intra‑arterial, intramuscular, or intrathecal injection, depending on the clinical indication and prescribing physician’s judgment. The route, dose, and frequency are determined by the treating specialist and are tailored to each patient’s therapeutic needs.

Serious risks include severe liver toxicity, pulmonary fibrosis, life‑threatening infections due to immunosuppression, bone‑marrow failure, and acute renal impairment. Patients should be monitored regularly for hepatic enzymes, lung function, blood counts, and renal parameters to detect these complications early.

Methotrexate Pfizer should be avoided in pregnant or breastfeeding individuals, patients with severe renal or hepatic impairment, those with known hypersensitivity to methotrexate, and patients receiving live vaccines without appropriate medical supervision.

Published by

GNH India Pharmaceuticals Limited

Licensed pharmaceutical supplier

Last updated:

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