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Orange Book drug · Brand (NDA)

Imuran

Azathioprine

RLDNDA 016324 2 strengths Legacy Pharma
Approved
Prior to Jan 1, 1982
Strengths
2
Listed patents
0
Applications
2

What does the FDA Orange Book show for Imuran?

Imuran contains Azathioprine and appears in 2 FDA Orange Book applications. NDA 016324 is the lead filing, with 2 presentations shown in detail; the other exact-name filings are listed separately. The page preserves strength, dosage form, route, status, RLD/RS, TE, patent, and exclusivity facts. Clinical labeling requires an exact application-matched source.

FDA applications
2; lead NDA 016324

Every filing shown uses the exact FDA product name; the lead filing supplies the detailed presentation view.

Lead application holder
Legacy Pharma Inc

The listed applicant holds the FDA application; this field does not establish the product manufacturer.

Product presentations
2

Each FDA product number remains tied to its own strength, dosage form, route, and status.

Marketing categories
Prescription and Discontinued

Orange Book marketing categories do not establish real-time inventory or commercial availability.

Reference roles
RLD / RS

RLD and RS designations are presentation-specific, not inferred from the trade name.

TE codes
AB

Therapeutic-equivalence codes apply only within the matching Orange Book product heading.

Listed patents
0

A zero means none appear in this snapshot, not that no patent rights exist.

Exclusivity records
0

FDA exclusivity and listed patent protection are distinct regulatory concepts.

Sourced from the official FDA Orange Book data file · snapshot refreshed

FDA product-presentation matrix

Every product number in this exact application
Every FDA product presentation under this application, with strength, dosage form and route, marketing status, therapeutic-equivalence code, and reference role.
ProductStrengthDosage form / routeMarketing statusTE codeReference role
00150MGTABLETORALPrescriptionAB
RLDRS
00225MGTABLETORALDiscontinuedNone posted
RLD

Marketing status, TE code, RLD, and RS are presentation-level fields. Never transfer one product number's designation to another presentation.

Who is responsible for this application?

Application holder is not the same as manufacturer

FDA application holder

Legacy Pharma Inc

The Orange Book identifies this organization as the applicant responsible for NDA 016324.

Manufacturer status

Not established by the Orange Book

A product-specific FDA label or NDC source must independently identify a manufacturer, labeler, distributor, packager, repackager, or relabeler. The applicant name is not used as a substitute for that evidence.

Regulatory interpretation

What the record means, and what it does not
FDA marketing status

Status varies by presentation: 1 prescription and 1 on the Discontinued Drug Product List

Orange Book status is assigned at the product-presentation level, so one strength can remain listed as prescription or OTC while another appears on the discontinued list.

Therapeutic equivalence

TE code AB across rated presentations

An AB code is an A-rating: FDA considers the product therapeutically equivalent to pharmaceutical equivalents in the same Orange Book heading and equivalence group. 1 presentation in the application has no posted TE code.

Patent & exclusivity record

No listed patents or exclusivity records

This means none appear for this application in the current Orange Book files. It is not a freedom-to-operate opinion and does not rule out unlisted patents, regulatory barriers, or product-specific rights.

Same-ingredient landscape

5 other ANDAs and 0 other NDAs found

5 of the related ANDA applications are not marked discontinued. Sharing an ingredient does not establish pharmaceutical or therapeutic equivalence; strength, dosage form, route, and TE group still matter.

Which products are meaningfully comparable?

Exact ingredient + dosage form + route cohorts

NDA 016324 appears in 1 comparison cohort. These groups narrow the same-ingredient landscape, but strength and TE code must still match before interpreting therapeutic equivalence.

Why are clinical sections unavailable?

Exact application-label matching status
Exact source match queuedQueue NDA-016324

No exact application-level FDA or DailyMed label match has been reviewed for this application. Approved uses, dosing, warnings, adverse reactions, and clinical evidence remain unavailable rather than being inherited from a related brand, generic, or ingredient record.

Until an exact application match passes human review, this page intentionally omits approved uses, dosing, warnings, adverse reactions, mechanism, and clinical-study summaries. It never inherits those claims from an RLD, brand, generic, or same-ingredient product.

Strengths & dosage forms

2 approved presentations · NDA 016324
TE ABRLDRS
Strength
50MG
Dosage form
TABLET
Route
ORAL
Marketing status
Prescription

Key dates

Approval, patents, exclusivity

No patent or exclusivity dates are listed for this product.

Pharmaceutical detail

FDA product record

Active ingredient

AZATHIOPRINE

Strength

50MG

Dosage form

TABLET

Route

ORAL

TE code

AB

Application

NDA 016324

Product number

001

Marketing status

Prescription

Reference listed drug (RLD)

Yes

Reference standard (RS)

Yes

Listed patents

Orange Book patent file

No patents are listed against this product in the Orange Book. Listed patents reflect those the NDA holder submits under 21 U.S.C. 355 and are not exhaustive.

Other FDA applications for Imuran

1 additional filing

The FDA has approved 2 separate applications under this product name. Each row is one application: a distinct applicant and approval for the same drug.

Other FDA applications approved under the product name Imuran, with applicant, approval date, number of strengths, therapeutic-equivalence code, and marketing status.
ApplicationApplicantApprovedStrengthsTE codeStatus
NDA 017391Casper Pharma LLCApproved Prior to Jan 1, 19821—Discontinued

Active-ingredient family

Brand + generics

This is a reference-listed drug (RLD), the basis for generic (ANDA) applications. Other products sharing this ingredient are listed below.

View full Azathioprine family

How to use this record responsibly

Scope, limitations, and primary sources

What to verify before making a decision

  • The applicant is the holder of legal responsibility for the application; the Orange Book does not establish that the applicant manufactured or currently markets every listed product.
  • RX, OTC, and discontinued are FDA listing categories, not real-time pharmacy inventory or commercial-availability data.
  • Therapeutic equivalence applies only within the matching ingredient, dosage form, route, strength, and TE-code group; same ingredient alone is insufficient.
  • Listed patent and exclusivity dates are regulatory intelligence, not legal advice, a freedom-to-operate analysis, or a reliable generic-launch forecast.
  • The Orange Book is not prescribing information and does not provide indications, dosing, contraindications, adverse reactions, recalls, or current safety communications.

Official FDA references

Data shown here is normalized for search and comparison. When a regulatory, substitution, launch, or legal decision turns on a field, verify it against the current FDA record and the relevant source document.

Imuran: frequently asked questions

Approval, therapeutic equivalence, patents, and exclusivity for this drug, from the FDA Orange Book.

Built directly from the FDA Orange Book product, patent, and exclusivity files refreshed Jul 02, 2026, 06:34 PM. Every strength of NDA 016324 is shown on this page. Interpret patents, exclusivity, availability, and therapeutic equivalence using the limitations above.

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