ANAPROX DS Drug Patent Profile

Which patents cover Anaprox Ds, and when can generic versions of Anaprox Ds launch?

Anaprox Ds is a drug marketed by Atnahs Pharma Us and is included in one NDA.

The generic ingredient in ANAPROX DS is naproxen sodium. There are forty-two drug master file entries for this compound. One hundred and thirty suppliers are listed for this compound. Additional details are available on the naproxen sodium profile page.

DrugPatentWatch^® Litigation and Generic Entry Outlook for Anaprox Ds

A generic version of ANAPROX DS was approved as naproxen sodium by CONTRACT PHARMACAL on January 13^th, 1997.

Summary for ANAPROX DS

US Patents:	0
Applicants:	1
NDAs:	1
Raw Ingredient (Bulk) Api Vendors:	78
Clinical Trials:	13
Patent Applications:	7,098
Drug Prices:	Drug price information for ANAPROX DS
DailyMed Link:	ANAPROX DS at DailyMed

See drug prices for ANAPROX DS

Recent Clinical Trials for ANAPROX DS

Identify potential brand extensions & 505(b)(2) entrants

Sponsor	Phase
Northwestern Medical Group	Phase 2
Shirley Ryan AbilityLab	Phase 2
Apkar Apkarian	Phase 4

See all ANAPROX DS clinical trials

US Patents and Regulatory Information for ANAPROX DS

Applicant	Tradename	Generic Name	Dosage	NDA	Approval Date	TE	Type	RLD	RS	Patent No.	Patent Expiration	Product	Substance	Delist Req.	Exclusivity Expiration
Atnahs Pharma Us	ANAPROX DS	naproxen sodium	TABLET;ORAL	018164-003	Sep 30, 1987	AB	RX	Yes	Yes

Expired US Patents for ANAPROX DS

Applicant	Tradename	Generic Name	Dosage	NDA	Approval Date	Patent No.	Patent Expiration
Atnahs Pharma Us	ANAPROX DS	naproxen sodium	TABLET;ORAL	018164-003	Sep 30, 1987
Atnahs Pharma Us	ANAPROX DS	naproxen sodium	TABLET;ORAL	018164-003	Sep 30, 1987
Atnahs Pharma Us	ANAPROX DS	naproxen sodium	TABLET;ORAL	018164-003	Sep 30, 1987

International Patents for ANAPROX DS

See the table below for patents covering ANAPROX DS around the world.

Country	Patent Number	Title	Estimated Expiration
United Kingdom	1301439
Switzerland	556810	VERFAHREN ZUR HERSTELLUNG DER D-2-(6-METHOXY-2-NAPHTHYL)-PROPIONSAEURE. (2-(6-Methoxy-2-naphthyl) propionic acid prepns. - anti-pyretics, analgesics, anti-inflammatory agents)
Canada	960689	2-NAPHTHYL ACETIC ACID DERIVATIVES AND COMPOSITIONS
Germany	2013641

Supplementary Protection Certificates for ANAPROX DS

Patent Number	Supplementary Protection Certificate	SPC Country	SPC Expiration	SPC Description
1411900	122012000052	Germany		PRODUCT NAME: NAPROXEN MIT ESOMEPRAZOL; NAT. REGISTRATION NO/DATE: 85145.00.00 20120202; FIRST REGISTRATION: GROSSBRITANNIEN PL 17901/0263 - 0001 20101105
0984957	PA2011005,C0984957	Lithuania		PRODUCT NAME: NAPROXENUM + ESOMEPRAZOLUM; REGISTRATION NO/DATE: LT/1/10/2302/001-LT/1/10/2302/012 20110126
1411900	18/2011	Austria		PRODUCT NAME: NAPROXEN UND ESOMEPRAZOL SOWIE DEREN PHARMAZEUTISCH ANNEHMBARE SALZE; NAT. REGISTRATION NO/DATE: 1-29937 20110105; FIRST REGISTRATION: GB PL 17901/0263-0001 20101105
0984957	SPC/GB11/013	United Kingdom		PRODUCT NAME: NAPROXEN AND ESOMEPRAZOLE; REGISTERED: UK PL 17901/0263-0001 20101105

ANAPROX DS market dynamics and financial trajectory: sales trends, pricing pressure, payer access, and competitive patent-driven risk

Last updated: June 8, 2026

Executive summary

• ANAPROX DS (naproxen sodium, extended-release capsules) remains a mature, low-growth NSAID brand facing steady generic substitution and periodic wholesale price pressure tied to broader naproxen market dynamics.
• The commercial trajectory for ANAPROX DS is dominated by (1) generic naproxen extended-release erosion, (2) payer formulary management favoring lowest net-cost options, and (3) procurement-driven pharmacy channel pricing rather than differentiation.
• Financial performance is structurally constrained by limited clinical differentiation versus generic naproxen sodium ER and the broader OTC-to-prescription channel shift for naproxen-containing therapies.

---

What is ANAPROX DS and how does it compete in the naproxen sodium ER market?

Answer: ANAPROX DS is a naproxen sodium extended-release product used for pain and inflammatory conditions. Its competitive set is primarily other naproxen sodium ER generics and, secondarily, branded and generic NSAID equivalents across overlapping indications.

What differentiates ANAPROX DS versus other NSAIDs?

• Same active ingredient class: naproxen sodium (NSAID).
• Delivery: extended-release formulation, targeting less frequent dosing than immediate-release naproxen products.
• Prescribing behavior: clinicians typically select by net cost, prior tolerance, and insurance coverage rather than formulation-level innovation.

How does payer access shape adoption?

• Typical payer logic for NSAIDs: tier preference for contracted generics; prior authorization and step therapy are more common for higher-cost branded NSAIDs and combination products than for generic naproxen.
• Pharmacy benefit design: copays and coinsurance are often lower for generic naproxen ER, driving plan-level substitution even when patients initiate on a brand.

Competitive landscape: which categories displace ANAPROX DS?

• Generic naproxen sodium extended-release products.
• Generic naproxen enteric-coated tablets and immediate-release naproxen formulations (therapeutic interchange in practice).
• Alternative analgesic classes for chronic pain and inflammation (selective COX-2 inhibitors where covered, topical NSAIDs, and non-NSAID options), reducing incremental NSAID volume.

---

How do generic substitution and channel dynamics drive ANAPROX DS sales?

Answer: ANAPROX DS faces persistent volume loss to generics through automatic substitution in retail and aggressive contracting in wholesales, with price compression following each generic expansion.

What are the main market mechanics affecting revenue?

• Retail substitution: pharmacy systems typically default to lowest-cost therapeutically equivalent products unless a “brand medically necessary” override is used.
• Wholesale pricing: distributors push for lower unit pricing as competitors expand shelf presence and plan contracts.
• Rebates and L/E (list-to-earnings) dynamics: in NSAIDs, branded products are often disadvantaged on net pricing due to competitive tendering.

Does extended-release provide pricing power?

• Limited. Extended-release is a formulation attribute, but payer incentives generally align with generic availability for the same molecule and comparable release profile.
• Any premium pricing tends to be temporary and absorbed into contracted net prices rather than protected gross margin.

What happens when generic supply increases?

• Price levels decline toward marginal distribution and manufacturing economics for the dominant generic suppliers.
• Margin compression accelerates when multiple ANDA entrants target the same SKU class and when payers re-optimize formularies.

---

When does ANAPROX DS face exclusivity and patent-driven loss of protection?

Answer: ANAPROX DS is a legacy NSAID product. Its market exposure is primarily “post-exclusivity” with ongoing erosion rather than an imminent branded exclusivity inflection.

How does patent structure usually map to NSAID brand value?

For older NSAIDs, the critical commercial event is typically earlier in the product lifecycle: generic entry based on the expiry of relevant patents and exclusivity. After generic entry, the remaining brand advantage is usually limited to distribution relationships, patient inertia, and payer-specific formulary quirks.

What does that imply for financial trajectory?

• Revenue generally trends with total NSAID demand minus share loss to generics.
• Growth is difficult even when total NSAID volume is stable, because share loss is structural.

(Note: A complete and accurate patent-by-patent exclusivity and expiration timeline requires Orange Book and litigation-specific data for ANAPROX DS; it is not provided in the inputs.)

---

What is the Orange Book status of ANAPROX DS and how does it affect generic entry risk?

Answer: The provided information does not include the Orange Book listing for ANAPROX DS, so a legal status mapping cannot be completed to a defensible standard.

What generic entry risks matter most for mature NSAID brands?

• Supply-side risk: increased generic manufacturing capacity reduces price but improves availability.
• Regulatory risk: for legacy NSAIDs, the key constraint is usually not FDA approval timing but formulary placement and contracting.

What would drive Paragraph IV activity in this context?

• Paragraph IV challenges tend to be more relevant when listed patents are still active. For legacy NSAID brands, most entry tends to be driven by expiration rather than ongoing litigation.

---

How do FDA and labeling changes influence ANAPROX DS market performance?

Answer: For mature NSAID products, labeling stability typically does not create sustained demand growth, and market outcomes remain payer- and generic-driven.

What labeling levers could change volume?

• Safety communications can reduce total NSAID utilization for certain populations.
• Indication expansions are uncommon at late lifecycle stages for legacy NSAIDs and usually do not offset generic substitution.

What regulatory signals typically matter commercially?

• Switches between prescription-only and OTC channels (or equivalent reclassification) tend to shift channel economics.
• Risk-management programs rarely create a durable benefit for a legacy branded NSAID against generics.

---

How do payer formularies and net pricing trends affect ANAPROX DS margins?

Answer: ANAPROX DS margins are typically constrained by rebate pressure and net price discounting as generics set the benchmark.

What drives net price compression in NSAIDs?

• Payer benchmark pricing and contracting.
• Mandatory generic substitution policies.
• Bidirectional pressure from PBMs seeking lower WAC-based spreads.

What is the typical financial pattern for legacy branded NSAIDs?

• Sales: declining volume share over time.
• Net price: downward drift as payers demand “equivalent” pricing versus generics.
• EBITDA margin: supported less by pricing and more by working capital efficiency, cost structure, and any residual specialty distribution.

(No ANAPROX DS company financial statements or segment reporting are provided in the inputs, so specific revenue and margin figures cannot be stated.)

---

Which competitors most pressure ANAPROX DS: extended-release naproxen vs broader NSAIDs?

Answer: The direct competitors are generic naproxen sodium extended-release products. Indirect competitive pressure comes from alternative NSAID delivery forms and non-NSAID analgesic classes.

Direct substitution set

• Generic naproxen sodium ER capsules/tablets.
• Generic naproxen enteric-coated and immediate-release products used interchangeably.

Indirect substitution set

• Topical NSAIDs for localized pain reducing oral NSAID demand.
• COX-2 selective agents where covered.
• Non-NSAID analgesics and combination regimens for chronic musculoskeletal pain.

How does this translate to market dynamics?

• The NSAID class is large but mature. Without new clinical differentiation, the default commercial outcome is share erosion to lower-cost options.

---

What does the financial trajectory likely look like for ANAPROX DS versus a hypothetical “new” branded entrant?

Answer: ANAPROX DS follows a mature-brand trajectory: early decline in share followed by low-growth residual revenue, rather than sustained growth.

Expected trajectory components

• Post-generic entry: revenue declines unless protected by preferential contracting or a high-switching-friction segment.
• Residual growth: limited, driven by population growth, generic supply variability, and occasional formulary exceptions.
• Price: compresses as payers renegotiate.

Investment or licensing implication

• The economic value is more about cash-flow stability and portfolio balance than a scalable growth story.
• Licensing upside is typically tied to distribution efficiency and manufacturing economics rather than unique clinical value.

---

Key Takeaways

• ANAPROX DS operates in a mature, highly substitutable naproxen sodium ER market where generic contracting and retail substitution drive volume and price compression.
• Commercial performance is driven by payer formulary design and net pricing mechanics, not by differentiation that can overcome generic benchmark behavior.
• A defensible patent and exclusivity risk assessment cannot be produced from the provided inputs because Orange Book and litigation details for ANAPROX DS are not included.
• The financial trajectory is best characterized as low-growth residual revenue with declining share pressure consistent with legacy NSAID brand dynamics.

---

FAQs

1. What drives pharmacy substitution for ANAPROX DS in retail channels?
2. How do PBMs typically tier naproxen sodium ER products for chronic pain coverage?
3. Do extended-release NSAIDs maintain higher net pricing versus immediate-release in payer contracts?
4. What kinds of FDA safety communications most affect NSAID utilization for branded products?
5. How should a brand like ANAPROX DS be valued when generic naproxen ER dominates the formulary?

---

References

(No sources were provided in the prompt, and no verifiable ANAPROX DS-specific Orange Book, FDA, or financial reporting data was included in the inputs.)