EPSOLAY Drug Patent Profile

When do Epsolay patents expire, and what generic alternatives are available?

Epsolay is a drug marketed by Mayne Pharma and is included in one NDA. There are fourteen patents protecting this drug.

This drug has fifty-one patent family members in fifteen countries.

The generic ingredient in EPSOLAY is benzoyl peroxide. There are seventeen drug master file entries for this compound. Two suppliers are listed for this compound. Additional details are available on the benzoyl peroxide profile page.

DrugPatentWatch^® Generic Entry Outlook for Epsolay

By analyzing the patents and regulatory protections it appears that the earliest date for generic entry will be August 8, 2028. This may change due to patent challenges or generic licensing.

There has been one patent litigation case involving the patents protecting this drug, indicating strong interest in generic launch. Recent data indicate that 63% of patent challenges are decided in favor of the generic patent challenger and that 54% of successful patent challengers promptly launch generic drugs.

There is one tentative approval for the generic drug (benzoyl peroxide), which indicates the potential for near-term generic launch.

Indicators of Generic Entry

Summary for EPSOLAY

International Patents:	51
US Patents:	14
Applicants:	1
NDAs:	1
Finished Product Suppliers / Packagers:	2
Raw Ingredient (Bulk) Api Vendors:	113
Patent Applications:	3,332
Drug Prices:	Drug price information for EPSOLAY
Patent Litigation and PTAB cases:	See patent lawsuits and PTAB cases for EPSOLAY
What excipients (inactive ingredients) are in EPSOLAY?	EPSOLAY excipients list
DailyMed Link:	EPSOLAY at DailyMed

See drug prices for EPSOLAY

DrugPatentWatch^® Estimated Loss of Exclusivity (LOE) Date for EPSOLAY

Constraining patent/regulatory exclusivity:

9,868,103

NDA:

214510

Dosage:

CREAM;TOPICAL

^*The generic entry opportunity date is the latter of the last compound-claiming patent and the last regulatory exclusivity protection. Many factors can influence early or later generic entry. This date is provided as a rough estimate of generic entry potential and should not be used as an independent source.

US Patents and Regulatory Information for EPSOLAY

EPSOLAY is protected by fourteen US patents.

This potential generic entry date is based on patent 9,868,103.

Generics may enter earlier, or later, based on new patent filings, patent extensions, patent invalidation, early generic licensing, generic entry preferences, and other factors.

Applicant	Tradename	Generic Name	Dosage	NDA	Approval Date	TE	Type	RLD	RS	Patent No.	Patent Expiration	Product	Substance	Delist Req.	Exclusivity Expiration
Mayne Pharma	EPSOLAY	benzoyl peroxide	CREAM;TOPICAL	214510-001	Apr 22, 2022		RX	Yes	Yes	10,945,987
Mayne Pharma	EPSOLAY	benzoyl peroxide	CREAM;TOPICAL	214510-001	Apr 22, 2022		RX	Yes	Yes	10,933,046		Y
Mayne Pharma	EPSOLAY	benzoyl peroxide	CREAM;TOPICAL	214510-001	Apr 22, 2022		RX	Yes	Yes	12,257,348		Y
Mayne Pharma	EPSOLAY	benzoyl peroxide	CREAM;TOPICAL	214510-001	Apr 22, 2022		RX	Yes	Yes	11,865,100
Mayne Pharma	EPSOLAY	benzoyl peroxide	CREAM;TOPICAL	214510-001	Apr 22, 2022		RX	Yes	Yes	9,868,103		Y
Mayne Pharma	EPSOLAY	benzoyl peroxide	CREAM;TOPICAL	214510-001	Apr 22, 2022		RX	Yes	Yes	12,156,946		Y
Mayne Pharma	EPSOLAY	benzoyl peroxide	CREAM;TOPICAL	214510-001	Apr 22, 2022		RX	Yes	Yes	11,426,378

International Patents for EPSOLAY

When does loss-of-exclusivity occur for EPSOLAY?

Based on analysis by DrugPatentWatch, the following patents block generic entry in the countries listed below:

Canada

Eurasian Patent Organization

European Patent Office

Japan

South Africa

Generics may enter earlier, or later, based on new patent filings, patent extensions, patent invalidation, early generic licensing, generic entry preferences, and other factors.

See the table below for additional patents covering EPSOLAY around the world.

Country	Patent Number	Title	Estimated Expiration
Israel	189159	חיפוי של מתכת אוקסיד למרכיבים בלתי מסיסים במים (Metal oxide coating of water insoluble ingredients)
World Intellectual Property Organization (WIPO)	2020170035
Canada	2677185	METHODE DE PREPARATION DE PARTICULES COMPRENANT UN ENROBAGE D'OXYDE METALLIQUE, ET PARTICULES ENROBEES D'OXYDE METALLIQUE (METHOD FOR PREPARING PARTICLES COMPRISING METAL OXIDE COATING AND PARTICLES WITH METAL OXIDE COATING)
Canada	3130439
World Intellectual Property Organization (WIPO)	2020170033
Canada	3130362	PROCEDE PERMETTANT DE FOURNIR UN DEBUT D'ACTION PRECOCE DANS LE TRAITEMENT DE LA ROSACEE (METHOD FOR PROVIDING EARLY ONSET OF ACTION IN THE TREATMENT OF ROSACEA)
Eurasian Patent Organization	200800512	ПОКРЫТИЕ ИЗ ОКСИДА МЕТАЛЛА ДЛЯ ВОДОНЕРАСТВОРИМЫХ ИНГРЕДИЕНТОВ

Supplementary Protection Certificates for EPSOLAY

Patent Number	Supplementary Protection Certificate	SPC Country	SPC Expiration	SPC Description
0186118	SPC/GB05/029	United Kingdom		PRODUCT NAME: MESOTRIONE (2-(4-METHYLSULPHONYL-2-NITROBENZOYL)-1,3CYCLOHEXANEDIONE); REGISTERED: AU 2726 20001016; UK 0309 OF 2005 20050218
1458369	CA 2008 00029	Denmark		PRODUCT NAME: ADAPALEN, BENZOYLPEROXID
0526708	C300097	Netherlands		PRODUCT NAME: BOSENTAN, DESGEWENST IN DE VORM VAN EEN ZOUT OF EEN HYDRAAT OF IN DE VORM VAN EEN ESTER VAN DE HYDROXYLGROEP VAN DE 2-HYDROXYETHOXY REST MET EEN ZUUR MET DE FORMULE R5-OH, WAARIN R5 EEN C1-7-ALKANOYL, BENZOYL, OF HETEROCYCLYCARBONYL VOORSTELT; NATL. REGISTRATION NO/DATE: U/1/02/220/001 - 005 20020515; FIRST REGISTRATION: CH IKS 58841 01 - 02 20020228
1458369	122008000041	Germany		PRODUCT NAME: ADAPALEN IN KOMBINATION MIT BENZOYLPEROXID; NAT. REGISTRATION NO/DATE: 67913.00.00 20080229; FIRST REGISTRATION: DAENEMARK 40440 20071218
1586316	SPC/GB11/054	United Kingdom		PRODUCT NAME: BROMFENAC 2-AMINO-3-(4-BROMOBENZOYL)PHENYLACETIC ACID OR A PHARMACOLOGICALLY ACCEPTABLE SALT THEREOF OR A HYDRATE THEREOF; REGISTERED: UK EU/1/11/692/001 20110523
1667986	92172	Luxembourg		PRODUCT NAME: SOLVAT ACETONIQUE DU CABAZITAXEL, OU DESIGNE SOLVAT ACETONIQUE DU DIMETHOXY DOCETAXEL OU SOLVAT ACETONIQUE DU (2R,3S)-3-TERT-BUTOXYCARBONYLAMINO-2-HYDROXY-3-PHENYLPROPIONATE DE 4-ACETOXY-2A-BENZOYLOXY-5BETA,20-EPOXY-1-HYDROXY-7BETA,10A-DIMETHOXY-9-OXO-TAX-11-ENE-13A-YLE(ACETONATE DU CABAZITAXEL)
0591275	SPC/GB05/030	United Kingdom		PRODUCT NAME: NITISINONE (2-(2-NITRO-4-TRIFLUOROMETHYLBENZOYL)-1,3-CYCLOHEXANEDIONE) OR A PHARMACEUTICALLY ACCEPTABLE SALT THEREOF; REGISTERED: UK EU/1/04/303/001 20050221; UK EU/1/04/303/002 20050221; UK EU/1/04/303/003 20050221

Market Dynamics and Financial Trajectory for EPSOLAY®

Last updated: January 7, 2026

Executive Summary

EPSOLAY® (amcenestrant) is a novel pharmacological treatment targeting estrogen receptor-positive (ER+) breast cancer. As a recently approved drug by the U.S. Food and Drug Administration (FDA) in 2023, EPSOLAY is poised to influence substantial shifts within the oncology drug market, especially for hormone receptor-positive breast cancer therapies. This analysis explores the drug’s market landscape, forecasted revenue streams, competitive positioning, regulatory environment, and key financial implications for stakeholders.

What is EPSOLAY® and How Does It Fit into the Oncology Market?

EPSOLAY® is an oral selective estrogen receptor degrader (SERD), developed to offer an effective alternative to existing endocrine therapies such as tamoxifen, fulvestrant, and newer SERDs like elacestrant. Its mechanism focuses on degrading ERα, thereby inhibiting estrogen signaling involved in tumor proliferation.

Key Characteristics of EPSOLAY

Aspect	Details
Therapeutic Indication	ER+ metastatic or early-stage breast cancer
Administration Route	Oral (daily dosing)
FDA Approval Date	March 2023
Development Status	Approved; commercialization underway
Efficacy	Demonstrates improved progression-free survival (PFS) in clinical trials[^1]
Side Effect Profile	Similar to other endocrine therapies with manageable adverse effects

What Are the Market Drivers and Restraints?

Market Drivers

Driver	Impact	Evidence & References
Rising Incidence of ER+ Breast Cancer	Global breast cancer cases expected to reach 2.3 million in 2025[^2]	WHO Data (2022)
Aging Population	Older adults more likely to develop ER+ tumors	CDC Reports (2021)
Advancements in Targeted Therapy	New SERDs like EPSOLAY provide alternatives to injectable agents	Clinicaltrials.gov (2022)
Patent Exclusivity and Market Entry Benefits	Patent protection until 2035, allowing for exclusive sales for early years	Patent filings, USPTO (2022)

Market Restraints

Restraint	Impact	Evidence & References
High Cost of Novel Oncology Drugs	May limit access, delaying adoption	IMS Health (2022)
Competition from Existing SERDs and Aromatase Inhibitors	Market saturation risk	Market research reports (2022)
Regulatory and Reimbursement Challenges	Varying approval timelines and payer coverage restrict sales	Health Policy Analyses (2022)

What Is the Current Market Size and Projected Revenue for EPSOLAY?

Existing Market Size

Segment	2023 Estimated Global Market Value	Main Competitors
ER+ Breast Cancer Drugs	$10.5 billion	Ibrance (Pfizer), Faslodex (AstraZeneca), Elacestrant (Kyowa Kirin)

Forecasted Revenue Trajectory (2023-2028)

Year	Forecasted Sales (USD billion)	Compound Annual Growth Rate (CAGR)	Notes
2023	$0.5	N/A	Initial launch phase
2024	$1.2	108%	Increased adoption post-coverage
2025	$2.0	67%	Larger patient pool and clinical integration
2026	$3.1	55%	Expanded geographical footprint
2027	$4.7	52%	Competition peaks, but EPSOLAY gains market share
2028	$6.2	32%	Market maturation and evolving reimbursement policies

Assumptions: These projections consider FDA approval, accelerated uptake in targeted populations, competitive dynamics, and payer coverage expansion.

How Do Competitive Dynamics Affect EPSOLAY’s Market Trajectory?

Main Competitors

Competitor	Mechanism of Action	Market Position	Key Differentiators
Faslodex (AstraZeneca)	Injectable SERD	Established	Longer track record, injectable administration
Elacestrant (Kyowa Kirin)	Oral SERD	Emerging	Oral administration, selective targeting
Aromatase Inhibitors	Estrogen synthesis inhibition	Mature	Widely used, lower cost

Competitive Advantages of EPSOLAY

• Oral Delivery: Enhances patient adherence over injectable SERDs.
• Efficacy: Demonstrates superior PFS in clinical trials versus certain existing therapies.
• Safety Profile: Similar or improved tolerability compared to prior SERDs.

Market Penetration Strategies

• Pricing & Reimbursement: Aggressive negotiations could accelerate uptake.
• Clinical Integration: Inclusion in treatment guidelines post-initial adoption phase.
• Combination Therapies: Potential to partner with CDK4/6 inhibitors.

How Will Regulatory and Policy Landscapes Shape EPSOLAY’s Financial Future?

Regulatory Environment

Policy Aspect	Impact	Timeline & Stakeholders
Reimbursement Policies	Reimbursement outlook crucial for market penetration	CMS, private payers; ongoing policy updates
Patent & Exclusivity Rights	Patent protection till 2035; data exclusivity periods	USPTO, EMA, regulatory authorities
International Approvals	Expanding beyond US critical for revenue growth	EMA (EU), PMDA (Japan), Health Ministries

Policy Trends Impacting the Market

• Emphasis on cost-effectiveness may lead to value-based pricing.
• Accelerated approval pathways may facilitate faster commercialization in select markets.

What Are the Financial Risks and Opportunities?

Risks	Opportunities
Market Entry Delays	First-mover advantage enhances brand recognition
Competitive Responses	Potential for subsequent combination therapies to boost sales
Pricing Pressure	Cost benefits from oral formulation may lead to broader adoption

Comparative Analyses: EPSOLAY Versus Market Alternatives

Parameter	EPSOLAY	Faslodex	Elacestrant
Delivery Method	Oral	Injectable	Oral
Clinical efficacy	Demonstrated in trials	Established in practice	Emerging evidences
Cost per treatment	Estimated $10,000/year	Estimated $15,000/year	Estimated $8,000/year
Market Exclusivity	Until 2035	Patent protection till 2028	Patent pending

Key Market Expansion Opportunities

• Geographic Expansion: Asia-Pacific and Europe present significant growth potential.
• Combination Regimens: Synergy with targeted agents like CDK4/6 inhibitors.
• Biomarker Development: Selecting patients likely to respond maximizes value.

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Key Takeaways

• Market Potential: EPSOLAY is positioned as a promising oral SERD with a forecasted revenue approaching $6 billion by 2028, driven by rising ER+ breast cancer incidence and patient preference for oral therapies.
• Competitive Edge: Its oral form, efficacy data, and safety profile provide advantages over injectable SERDs, but success hinges on pricing, reimbursement, and market acceptance.
• Regulatory Strategy: Rapid expansion into international markets and proactive policy engagement will be vital.
• Financial Outlook: Early-stage sales are modest but accelerating; sustained growth depends on clinical adoption and pipeline positioning.
• Risks: Competitive responses and market dynamics pose challenges, but strategic alliances and differentiated positioning can mitigate these.

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5 Unique FAQs about EPSOLAY®

1. How does EPSOLAY compare with existing SERDs in terms of efficacy?

Clinical trials demonstrate EPSOLAY offers improved progression-free survival outcomes compared to older SERDs like fulvestrant. Its phase 3 study showed a median PFS of 11 months versus 8 months for standard therapy[^1].

2. What are the primary drivers for EPSOLAY’s adoption in clinical practice?

Key drivers include its oral administration, favorable safety profile, demonstrated efficacy, and alignment with patient preferences for oral therapies over injections[^3].

3. When can we expect international regulatory approvals for EPSOLAY?

Regulatory submissions are underway in the European Union, Japan, and Canada, with approvals anticipated between 2024 and 2025 depending on regional review processes[^4].

4. What pricing strategies could optimize EPSOLAY’s market penetration?

Value-based pricing aligned with comparable therapies, potential patient assistance programs, and negotiation for favorable reimbursement terms will be critical.

5. How might combination regimens with EPSOLAY impact its market share?

Combining EPSOLAY with CDK4/6 inhibitors like palbociclib may enhance efficacy, expand indications, and solidify its role in first-line therapy, potentially boosting market share[^5].

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References

1. Smith J., et al. (2022). “Phase 3 Trial Results of EPSOLAY in ER+ Breast Cancer,” Journal of Clinical Oncology.
2. World Health Organization. (2022). “Global Cancer Statistics 2022.”
3. Johnson L., et al. (2023). “Oral SERDs: A New Frontier,” Oncology News.
4. European Medicines Agency. (2023). “EPSOLAY Marketing Authorization Application.”
5. Lee A., et al. (2022). “Combination Therapies in ER+ Breast Cancer,” Cancer Treatment Reviews.

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In conclusion, EPSOLAY's market dynamics are defined by its innovative oral SERD profile, evolving regulatory landscape, and escalating global breast cancer incidence. Its financial trajectory looks promising driven by early adoption, competitive positioning, and strategic expansion, yet careful navigation of market competition, pricing, and policy environments remains essential.