Product image of Immufalk (Azathioprine) supplied by GNH India

Immufalk

Active Ingredient:
Azathioprine
Origin:
EU

Immufalk (Azathioprine)

Azathioprine, the active ingredient in Immufalk, is an antimetabolite immunosuppressant presented as an oral tablet for oral use. It is used to prevent organ transplant rejection and to manage autoimmune and inflammatory bowel diseases in adult patients.

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

Manufacturer / TM Owner

Dr. Falk Pharma G.M.B.H.

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Indications & Clinical Uses

  • Azathioprine is employed in several immune‑mediated conditions to reduce pathological immune activity.
  • Organ transplant rejection: helps prevent graft rejection by suppressing the host immune response.
  • Rheumatoid arthritis: reduces disease activity and joint inflammation in adult patients.
  • Inflammatory bowel disease (Crohn's disease, ulcerative colitis): maintains remission and decreases intestinal inflammation.

How It Works

  • After oral absorption, azathioprine is converted to 6‑mercaptopurine, which interferes with purine synthesis. This inhibition blocks DNA replication in rapidly dividing cells, particularly T and B lymphocytes, leading to reduced proliferation and a dampened immune response.

Side Effects

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

Common Side Effects

  • Nausea or vomiting
  • Loss of appetite
  • Mild leukopenia or lymphopenia
  • Skin rash or pruritus
  • Elevated liver enzymes
  • Fatigue or headache

Serious or Rare Side Effects

  • Severe bone‑marrow suppression (pancytopenia)
  • Hepatotoxicity or cholestatic liver injury
  • Pancreatitis
  • Opportunistic infections
  • Increased risk of malignancies (e.g., lymphoma)
  • Severe hypersensitivity reactions

Precautions & Warnings

  • When using azathioprine, careful monitoring and patient education are essential.
  • Monitor blood counts regularly: detect early bone‑marrow suppression.
  • Assess liver function periodically: identify hepatotoxicity.
  • Screen for infections before initiation: avoid exacerbating latent infections.
  • Avoid in patients with known hypersensitivity to azathioprine or its metabolites.
  • Use caution in renal or hepatic impairment: dose adjustments may be required.
  • Store at ambient temperature: keep in the original container, protect from moisture and direct sunlight.

Avoid Interactions

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

Major Interactions (Avoid)

  • Allopurinol or febuxostat: can cause profound myelosuppression.
  • Warfarin: azathioprine may enhance anticoagulant effect, increasing bleeding risk.
  • Live vaccines: immunosuppression may lead to uncontrolled infection.
  • Ribavirin: combined use raises risk of severe hematologic toxicity.
  • Methotrexate: additive bone‑marrow suppression.

Moderate Interactions (Monitor Closely)

  • ACE inhibitors or ARBs: may increase risk of renal dysfunction.
  • NSAIDs: can worsen renal impairment and affect platelet function.
  • Trimethoprim‑sulfamethoxazole: may enhance myelosuppression.
  • Azole antifungals: can increase azathioprine plasma levels.
  • Oral contraceptives: azathioprine may reduce hormonal efficacy.

Frequently Asked Questions

Immufalk, whose active ingredient is azathioprine, is prescribed to prevent organ transplant rejection and to manage autoimmune disorders such as rheumatoid arthritis as well as inflammatory bowel diseases including Crohn's disease and ulcerative colitis. It works by suppressing the immune system to reduce tissue damage caused by overactive immune responses.

Azathioprine is converted after ingestion to 6‑mercaptopurine, which interferes with purine synthesis. This blocks DNA replication in rapidly dividing cells, especially T and B lymphocytes, leading to reduced proliferation of these immune cells and consequently dampening the overall immune response.

The appropriate dose of Immufalk is individualized by the prescribing clinician based on the specific indication, patient weight, renal and hepatic function, and response to therapy. Dosage adjustments are made during treatment to balance efficacy with safety, and patients should follow the prescriber’s instructions precisely.

The safety of azathioprine during pregnancy or lactation is not definitively established and should be evaluated by the treating physician. In some cases, the benefits may outweigh potential risks, but a thorough risk‑benefit assessment and close monitoring are essential for pregnant or nursing patients.

To place an order, submit an enquiry on the Immufalk 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 any cold‑chain requirements) and the necessary import documentation.

Azathioprine belongs to the antimetabolite class, differing from calcineurin inhibitors such as cyclosporine or tacrolimus. While all suppress immune activity, azathioprine primarily inhibits purine synthesis, offering a distinct side‑effect profile and dosing convenience (oral administration). Choice of agent depends on the clinical scenario, organ transplanted, and individual patient tolerance.

Immufalk should be stored at ambient temperature, preferably below 25 °C. Keep the tablets in the original packaging, protect them from moisture, heat and direct sunlight, and ensure the container is tightly closed to maintain product stability throughout its shelf life.

Immufalk is taken orally, usually as a tablet, with or without food as directed by the prescriber. The exact timing and frequency are individualized, and patients should swallow the tablet whole with water, adhering to the dosing schedule provided by their healthcare professional.

The most serious risks include severe bone‑marrow suppression leading to pancytopenia, hepatotoxicity, pancreatitis, opportunistic infections, and an increased long‑term risk of certain malignancies such as lymphoma. Patients should be monitored regularly for blood count and liver function abnormalities, and any concerning symptoms should be reported promptly.

Immufalk is contraindicated in individuals with known hypersensitivity to azathioprine or any of its components, and it should be avoided in patients with active severe infections. Caution is also advised for those with significant hepatic or renal impairment, and it is generally not recommended for pregnant or breastfeeding women without specialist guidance.

Published by

GNH India Pharmaceuticals Limited

Licensed pharmaceutical supplier

Last updated:

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