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 10 mg/mL injectable solution for intra‑arterial, intramuscular, intravenous use. It treats rheumatoid arthritis, psoriasis, acute lymphoblastic leukemia, non‑Hodgkin lymphoma, and ectopic pregnancy in appropriate 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 Healthcare Ireland Unlimited Company

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Indications & Clinical Uses

Methotrexate is used across several disease families, primarily as an antimetabolite that interferes with cell proliferation.

  • Rheumatoid arthritis: reduces joint inflammation and slows disease progression.
  • Psoriasis: improves skin lesions and decreases plaque formation.
  • Acute lymphoblastic leukemia: induces remission by inhibiting malignant cell proliferation.
  • Non‑Hodgkin lymphoma: contributes to tumor control when used in combination regimens.
  • Ectopic pregnancy: terminates trophoblastic tissue non‑surgically.

How It Works

  • Methotrexate inhibits dihydrofolate reductase, preventing the regeneration of tetrahydrofolate needed for purine and pyrimidine synthesis. This blockade reduces DNA, RNA, and protein production, leading to impaired cell replication, particularly in rapidly dividing immune and malignant cells, thereby exerting its antineoplastic and immunosuppressive effects.

Side Effects

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

Common Side Effects

  • Nausea and vomiting.
  • Fatigue or general weakness.
  • Oral mucosal ulceration (mouth sores).
  • Transient elevation of liver enzymes.
  • Decreased white blood cell count.
  • Mild rash or itching.

Serious or Rare Side Effects

  • Severe hepatotoxicity or liver fibrosis.
  • Pulmonary fibrosis or interstitial pneumonitis.
  • Profound bone marrow suppression leading to infection or bleeding.
  • Acute renal failure.
  • Life‑threatening skin reactions such as Stevens‑Johnson syndrome.
  • Anaphylactic or severe hypersensitivity reactions.

Precautions & Warnings

Before initiating therapy, several safety considerations are recommended.

  • Liver Monitoring: perform baseline and periodic liver function tests.
  • Hematologic Surveillance: regularly check complete blood counts.
  • Pregnancy Avoidance: contraindicated in pregnancy; ensure effective contraception.
  • Folic Acid Supplementation: co‑administer to reduce mucosal and hematologic toxicity.
  • Renal Function Adjustment: modify dose in patients with impaired renal clearance.
  • Store at ambient temperature: keep in original packaging, protect from moisture and light.

Avoid Interactions

Methotrexate interacts with several medicines that may alter its efficacy or toxicity.

Major Interactions (Avoid)

  • Non‑steroidal anti‑inflammatory drugs (NSAIDs): increase risk of renal and gastrointestinal toxicity.
  • Trimethoprim‑sulfamethoxazole: potentiates myelosuppression.
  • Live vaccines: heightened risk of infection due to immunosuppression.

Moderate Interactions (Monitor Closely)

  • Azathioprine: additive immunosuppressive effect, monitor blood counts.
  • Phenytoin: may reduce methotrexate plasma levels, adjust dosing if needed.
  • Alcohol: exacerbates hepatic toxicity, advise limited intake.

Frequently Asked Questions

Methotrexate Pfizer is indicated for rheumatoid arthritis, psoriasis, acute lymphoblastic leukemia, non‑Hodgkin lymphoma, and ectopic pregnancy. In each case, the drug works by inhibiting cell proliferation, which helps control inflammation, reduce abnormal skin growth, and target malignant or ectopic tissue.

Methotrexate blocks the enzyme dihydrofolate reductase, preventing the formation of tetrahydrofolate, a cofactor required for synthesizing DNA, RNA, and proteins. This inhibition limits the growth of rapidly dividing cells, such as immune cells in autoimmune disease and cancer cells in hematologic malignancies.

The specific dose and schedule of Methotrexate Pfizer are determined by the prescribing clinician based on the indication, patient weight, renal function, and treatment goals. Healthcare providers tailor the regimen to achieve therapeutic benefit while minimizing toxicity.

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 during 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 shares a similar mechanism with other folate antagonists such as pemetrexed, but it is distinguished by its broader range of approved indications, including autoimmune diseases and several cancers. Its dosing flexibility and extensive clinical experience make it a first‑line option in many treatment protocols.

Methotrexate Pfizer should be stored at ambient temperature, below 25 °C, in its original container. Protect the product from moisture, direct sunlight, and extreme temperature fluctuations to maintain stability and potency.

Methotrexate Pfizer is supplied as a sterile injectable solution and can be given via intra‑arterial, intramuscular, or intravenous routes, depending on the clinical indication and physician preference. Administration is performed by qualified healthcare professionals in a controlled setting.

The most serious risks include severe liver toxicity, pulmonary fibrosis, profound bone‑marrow suppression leading to infection or bleeding, renal failure, and rare but life‑threatening skin reactions such as Stevens‑Johnson syndrome. Patients should be monitored closely for early signs of these complications.

Methotrexate Pfizer is contraindicated in pregnant women, individuals with severe liver disease, uncontrolled infections, and those with known hypersensitivity to methotrexate or its excipients. Caution is also advised for patients with impaired renal function or existing blood‑cell disorders.

Published by

GNH India Pharmaceuticals Limited

Licensed pharmaceutical supplier

Last updated:

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