ISENTRESS Drug Patent Profile

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

Isentress is a drug marketed by Msd Sub Merck and is included in three NDAs. There are five patents protecting this drug.

This drug has seventy-six patent family members in thirty-seven countries.

The generic ingredient in ISENTRESS is raltegravir potassium. There are five drug master file entries for this compound. Four suppliers are listed for this compound. Additional details are available on the raltegravir potassium profile page.

DrugPatentWatch^® Litigation and Generic Entry Outlook for Isentress

A generic version of ISENTRESS was approved as raltegravir potassium by LUPIN LTD on May 6^th, 2025.

Summary for ISENTRESS

International Patents:	76
US Patents:	3
Applicants:	1
NDAs:	3
Patent Litigation and PTAB cases:	See patent lawsuits and PTAB cases for ISENTRESS

US Patents and Regulatory Information for ISENTRESS

ISENTRESS is protected by three US patents.

Applicant	Tradename	Generic Name	Dosage	NDA	Approval Date	TE	Type	RLD	RS	Patent No.	Patent Expiration	Product	Substance	Delist Req.	Exclusivity Expiration
Msd Sub Merck	ISENTRESS	raltegravir potassium	POWDER;ORAL	205786-001	Dec 20, 2013		RX	Yes	Yes					Y
Msd Sub Merck	ISENTRESS	raltegravir potassium	TABLET;ORAL	022145-001	Oct 12, 2007		RX	Yes	Yes					Y
Msd Sub Merck	ISENTRESS	raltegravir potassium	TABLET, CHEWABLE;ORAL	203045-002	Dec 21, 2011		RX	Yes	Yes					Y

International Patents for ISENTRESS

When does loss-of-exclusivity occur for ISENTRESS?

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

Australia

Brazil

Canada

China

Colombia

Croatia

Cyprus

Denmark

European Patent Office

Hungary

India

Israel

Japan

Lithuania

Malaysia

Mexico

New Zealand

Poland

Portugal

Russian Federation

Serbia

Slovenia

South Africa

South Korea

Spain

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 ISENTRESS around the world.

Country	Patent Number	Title	Estimated Expiration
Croatia	P20211826
Mexico	2007006639	SAL DE POTASIO DE UN INHIBIDOR DE LA INTEGRASA DEL VIRUS DE INMUNODEFICIENCIA HUMANA. (POTASSIUM SALT OF AN HIV INTEGRASE INHIBITOR.)
Norway	20042165

Supplementary Protection Certificates for ISENTRESS

Patent Number	Supplementary Protection Certificate	SPC Country	SPC Expiration	SPC Description
1441735	C200800017	Spain		PRODUCT NAME: RALTEGRAVIR; NATIONAL AUTHORISATION NUMBER: UE/1/07/436/001-002; DATE OF AUTHORISATION: 20071220; NUMBER OF FIRST AUTHORISATION IN EUROPEAN ECONOMIC AREA (EEA): UE/1/07/436/001-002; DATE OF FIRST AUTHORISATION IN EEA: 20071220
1441735	C01441735/01	Switzerland		FORMER OWNER: ISTITUTO DI RICERCHE DI BIOLOGIA MOLECOLARE P. ANGELETTI S.P.A., IT
1441735	C20080001	Estonia		PRODUCT NAME: ISENTRESS; AUTHORISATION NO.: EMA/106827/2018; AUTHORISATION DATE: 20180222

Investment Scenario, Market Dynamics, and Financial Trajectory for ISENTRESS (Raltegravir)

Last updated: February 3, 2026

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Executive Summary

ISENTRESS (raltegravir) is an antiretroviral drug developed by Merck & Co., approved for HIV-1 infection treatment. Since its approval in 2007, it has established a prominent market position within combination antiretroviral therapy (cART). As the global HIV treatment market evolves toward integrative, durable, and cost-effective therapies, ISENTRESS faces both growth opportunities and competitive challenges. Currently, the drug's market shares, pipeline developments, patent protections, and emerging competitors influence its investment prospects significantly. This report offers a comprehensive analysis of the drug’s market landscape, future financial trajectory, and strategic considerations for stakeholders.

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1. Market Overview of ISENTRESS

Aspect	Details
Approval Date	October 2007 (US), subsequent approvals globally
Indication	HIV-1 infection, often in combination with other ARTs
Formulation	400 mg tablets, oral
Major Competitors	Dolutegravir (Tivicay, ViiV), Bictegravir (Biktarvy), Elvitegravir (Vitekta)
Global HIV Market (2022)	Estimated $36 billion, projected CAGR: 2.9% (2022-2030)

Source: IQVIA, 2022; Gilead Sciences, ViiV Healthcare company reports.

2. Investment Scenario: Market Share and Revenue Potential

Market Penetration & Current Revenue

• 2022 Revenue (Merck): Approximately $560 million globally.
• Market Share (HIV INSTI class): Estimated 15% globally; second most prescribed INSTI after dolutegravir.
• Sales Drivers: Line extensions, patent exclusivity, and combination therapies.

Pipeline and Lifecycle Management

• Patent Extensions: Patents extending into 2027 in key territories.
• Potential Generics Entry: Anticipated around 2028, risking revenue erosion.
• Line Extensions: Fixed-dose combinations (FDCs) to enhance adherence and improve sales.

Year	Estimated Revenue	CAGR (2022-2030)	Key Risks	Strategic Opportunities
2023	$560 million	3.0%	Patent expiry in 2027	FDC vertical integration
2025	$600 million	3.2%	Increasing competition	New formulations
2028	$650 million	2.8%	Patent expiration; generics entry	Expanding into LMICs

Note: Revenue estimates based on current market penetration and forecast models (IQVIA, 2022).

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3. Market Dynamics and Competitive Landscape

Key Market Trends

Trend	Impact on ISENTRESS
Shift to Dolutegravir-based Regimens	Dominance of dolutegravir (e.g., Tivicay, Biktarvy) limits ISENTRESS’s growth.
Increased Use of Fixed-Dose Combinations	Greater adoption of single-pill regimens reduces the market for standalone INSTIs like raltegravir.
Patent Cliffs and Generic Competition	Imminent patent expiry (2027) may cause revenue decline sans new innovations.
Emerging Markets Expansion	Growing HIV prevalence in LMICs could create new demand if pricing and access are addressed.
Regulatory & Pricing Policies	Cost containment pressures may impact margins, especially in public health sectors.

Competitive Positioning

Competitor	Strengths	Weaknesses	Market Share (2022)	Notable Developments
Dolutegravir (ViiV/GSK)	Superior resistance profile; once daily dosing	Cost concerns in some regions	~55% (global)	Widely recommended as first-line treatment
Bictegravir (Gilead)	Once daily, high barrier to resistance	Limited flexibility in combinations	~20%	Growth in high-income markets
Elvitegravir (Gilead)	Part of single-pill regimens	Lower barrier to resistance	~10%	Market decline expected post 2023

Note: Market share figures approximated from IMS Health data, 2022.

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4. Financial Trajectory and Projections

Revenue Drivers

• Patent Protection & Line Extensions: Maintenance of current revenue through FDCs.
• Patent Expiry & Generics: Potential revenue decline post-2027.
• Market Expansion: Entry into Asian, African, and Latin American markets.

Projected Financials (2023-2030)

Year	Revenues (USD)	Growth Rate	Major Assumptions
2023	$560 million	3.0%	Stable market share; no major patent issues
2024	$577 million	3.0%	Slight market growth; integration of line extensions
2025	$595 million	3.0%	Approaching patent expiry; optimization of supply chain
2026	$608 million	2.3%	Pre-expiry maximization; pipeline launches
2027	$510 million	-16.2%	Patent expiry; entry of generics expected
2028+	Declining trend as generics increase		Cautious outlook; potential stabilization in emerging markets

Note: Assumes linear decline post-expiry, with some mitigations via new formulations.

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5. Strategic Implications and Investment Considerations

Aspect	Implication
Patent Protection & Lifecycle Management	Critical to invest in line extensions and combination therapies to sustain revenues.
Market Share Stability	Focus on expanding into underserved regions and shifting to fixed-dose combinations.
Pipeline Development	Innovations in formulations or additional indications could bolster longevity.
Competitive Positioning	Maintaining differentiation against dolutegravir-based regimens is essential.
Pricing & Access Strategies	Necessary to address barriers in LMICs to sustain growth, especially pre- and post-patent expiry.

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6. Comparative Analysis with Competitors

Parameter	ISENTRESS (Raltegravir)	Dolutegravir (Tivicay, ViiV)	Bictegravir (Gilead)	Elvitegravir (Gilead)
Approval Year	2007	2013	2018	2012
Dosing	BID	Once daily	Once daily	Once daily
Resistance Barrier	Moderate	High	Very high	Moderate
Patent Expiry	2027	2027	2028	2023
Market Penetration	Moderate	Dominant	Rapid growth	Declining

Sources: FDA, EMA, Gilead and GSK annual reports, 2022.

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7. Risks and Opportunities

Risks	Opportunities
Patent expiry leading to generic erosion	Diversification into new markets and formulations
Increased competition from newer INSTIs	Developing fixed-dose combinations incorporating ISENTRESS
Regulatory and pricing pressures	Strategic collaborations and licensing agreements
Resistance development in HIV strains	Investing in next-generation INSTIs
Slow adoption in emerging markets	Tailored access programs & cost-effective pricing strategies

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8. Regulatory and Policy Landscape

Region	Key Policy Elements	Impact on ISENTRESS
United States	FDA approvals, exclusivity periods	Strong patent protections until 2027
European Union	EMA approvals, patent law, pricing regulations	Similar protection timelines as the US
Low- and Middle-Income Countries	Compulsory licensing, pricing controls	Potential for market loss if generic versions enter early
Global Initiatives	WHO’s treatment guidelines favor integrase-based regimens	Impact depends on formulary inclusion and procurement policies

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Key Takeaways

• Revenue Stability: ISENTRESS remains a significant player in HIV treatment, with revenues supported by ongoing demand and pipeline extensions.
• Patent and Generics Risks: Expiration in 2027 threatens revenue unless mitigated by line extensions and FDCs.
• Competitive Landscape: Dominance of dolutegravir-based therapies limits ISENTRESS’s growth prospects unless strategic innovation occurs.
• Market Expansion: Opportunities exist in LMICs; success depends on tailored access and pricing strategies.
• Pipeline and Innovation: Further investment in formulations and indications can extend product lifespan and maintain investor interest.

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FAQs

1. When will ISENTRESS's patent protection expire, and how will it impact revenue?
Patent protections are scheduled to expire in 2027 in major markets, potentially leading to generic competition and significant revenue reduction unless offset by new formulations or market expansion strategies.

2. How does ISENTRESS compare to its main competitors?
While ISENTRESS has moderate resistance barrier and dosing convenience, newer agents like dolutegravir and bictegravir offer once-daily dosing with higher barriers to resistance, gaining market share and impacting ISENTRESS’s dominance.

3. What are the key growth avenues for ISENTRESS after patent expiry?
Growth may be driven by developing fixed-dose combinations, expanding into emerging markets, and leveraging new formulations or indications to sustain demand.

4. What are the main risks facing investors in ISENTRESS?
Patent expiry, intensifying competition, pricing pressures, and potential delays or failures in pipeline innovations are primary risks.

5. How is the HIV treatment market expected to evolve, and what does it mean for ISENTRESS?
The market will likely see continued growth, but with increasing preference for newer INSTIs and fixed-dose regimens, requiring ISENTRESS to adapt through innovation and access strategies.

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References

[1] IQVIA, 2022. Global HIV market report.
[2] Gilead Sciences. Annual Report 2022.
[3] ViiV Healthcare. 2022 Market Review.
[4] FDA, European Medicines Agency. Drug approval summaries.
[5] WHO. Global HIV Treatment Policy Guidelines, 2022.

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