Skip to content
Assyro AI
Orange Book drug · Brand (NDA)

Estrogel

Estradiol

RLDNDA 021166 2 strengths Ascend Theraps US
Approved
Feb 09, 2004
Strengths
2
Listed patents
0

What does the FDA Orange Book show for Estrogel?

Estrogel contains Estradiol and is the new drug FDA Orange Book record for NDA 021166. The application has 2 presentations with strength, dosage-form, route, status, RLD/RS, TE, patent, and exclusivity context. Current inventory and clinical labeling are not established without an application-matched source.

FDA application
NDA 021166

New drug application identity from the Orange Book snapshot.

Application holder
Ascend Therapeutics US LLC

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
Discontinued and Prescription

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
0010.06%GELTOPICALDiscontinuedNone posted
None posted
0020.06% (1.25GM/ACTIVATION)GEL, METEREDTRANSDERMALPrescriptionAB
RLDRS

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

Ascend Therapeutics US LLC

The Orange Book identifies this organization as the applicant responsible for NDA 021166.

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 on the Discontinued Drug Product List and 1 prescription

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

41 other ANDAs and 16 other NDAs found

32 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 021166 appears in 2 comparison cohorts. These groups narrow the same-ingredient landscape, but strength and TE code must still match before interpreting therapeutic equivalence.

Gel · Topical

Estradiol

1 application
Product rows
1
Active applications
0
Active with AB row
0

Why are clinical sections unavailable?

Exact application-label matching status
Exact source match queuedQueue NDA-021166

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 021166
Discontinued
Strength
0.06%
Dosage form
GEL
Route
TOPICAL
Marketing status
Discontinued

Key dates

Approval, patents, exclusivity

  1. Approval

    FDA approval date of this drug product.

    22 yr 9 mo ago

  2. Today

Pharmaceutical detail

FDA product record

Active ingredient

ESTRADIOL

Strength

0.06%

Dosage form

GEL

Route

TOPICAL

TE code

Not listed

Application

NDA 021166

Product number

001

Marketing status

Discontinued

Reference listed drug (RLD)

No

Reference standard (RS)

No

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.

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 Estradiol 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.

Estrogel: 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 021166 is shown on this page. Interpret patents, exclusivity, availability, and therapeutic equivalence using the limitations above.

Related FDA reference tools

Agent CTA Background

Your Next Submission Could Take 6+ Fewer Weeks and Cost $250K Less.

Book a Demo