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Data updated: Mar 10, 2026

AZASAN

AZATHIOPRINE Nucleic Acid Synthesis Inhibitors
Immunology Approved 1999-06-07
1
Indication
--
Phase 3 Trials
26
Years on Market

Details

Status
Prescription
First Approved
1999-06-07
Routes
ORAL
Dosage Forms
TABLET

Companies

Active Ingredient: AZATHIOPRINE

AZASAN Approval History

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What AZASAN Treats

2 indications

AZASAN is approved for 2 conditions since its original approval in 1999. These indications span multiple therapeutic areas including oncology, immunology, and more.

  • Organ Rejection
  • Rheumatoid Arthritis
Source: FDA Label

AZASAN Boxed Warning

WARNING - MALIGNANCY Chronic immunosuppression with AZASAN, a purine antimetabolite increases risk of malignancy in humans. Reports of malignancy include post-transplant lymphoma and hepatosplenic T-cell lymphoma (HSTCL) in patients with inflammatory bowel disease. Physicians using this drug should be very familiar with this risk as well as with the mutagenic potential to both men and women and with possible hematologic toxicities. Physicians should inform patients of the risk of malignancy with...

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Trial Timeline

Full development history with FDA approval milestones

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Understanding FDA Approval Types
Count Type What it means
- ORIG Original approval - drug first enters market
- SUPPL - Efficacy New indication (new disease/condition approved)
- SUPPL - Labeling Label text changes (warnings, dosing updates)
- SUPPL - Manufacturing Production changes (new facility)
- SUPPL - Chemistry Formulation changes (new dosage strength)

Green lines in the timeline show ORIG and Efficacy approvals - the clinically meaningful milestones.

AZASAN FDA Label Details

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Indications & Usage

: AZASAN is indicated as an adjunct for the prevention of rejection in renal homotransplantation. It is also indicated for the management of active rheumatoid arthritis to reduce signs and symptoms. Renal Homotransplantation: AZASAN is indicated as an adjunct for the prevention of rejection in renal homotransplantation. Experience with over 16,000 transplants shows a 5-year patient survival of 35% to 55%, but this is dependent on donor, match for HLA antigens, anti-donor or anti-B-cell alloantigen antibody, and other variables. The effect of AZASAN on these variables has not been tested in con...

⚠️ BOXED WARNING

WARNING - MALIGNANCY Chronic immunosuppression with AZASAN, a purine antimetabolite increases risk of malignancy in humans. Reports of malignancy include post-transplant lymphoma and hepatosplenic T-cell lymphoma (HSTCL) in patients with inflammatory bowel disease. Physicians using this drug should ...

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Data Sources

Data sourced from official FDA and NIH databases. Click links to verify on original sources.