DELSTRIGO Drug Patent Profile

When do Delstrigo patents expire, and when can generic versions of Delstrigo launch?

Delstrigo is a drug marketed by Msd Merck Co and is included in one NDA. There are three patents protecting this drug and one Paragraph IV challenge.

This drug has one hundred and one patent family members in forty-six countries.

The generic ingredient in DELSTRIGO is doravirine; lamivudine; tenofovir disoproxil fumarate. One supplier is listed for this compound. Additional details are available on the doravirine; lamivudine; tenofovir disoproxil fumarate profile page.

DrugPatentWatch^® Generic Entry Outlook for Delstrigo

Delstrigo was eligible for patent challenges on August 30, 2022.

By analyzing the patents and regulatory protections it appears that the earliest date for generic entry will be August 30, 2032. This may change due to patent challenges or generic licensing.

There is one Paragraph IV patent challenge for this drug. This may lead to patent invalidation or a license for generic production.

Indicators of Generic Entry

Summary for DELSTRIGO

International Patents:	101
US Patents:	3
Applicants:	1
NDAs:	1

Paragraph IV (Patent) Challenges for DELSTRIGO

Tradename	Dosage	Ingredient	Strength	NDA	ANDAs Submitted	Submissiondate
DELSTRIGO	Tablets	doravirine; lamivudine; tenofovir disoproxil fumarate	100 mg/300 mg/ 300 mg	210807	1	2022-08-30

US Patents and Regulatory Information for DELSTRIGO

DELSTRIGO is protected by five US patents.

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
Msd Merck Co	DELSTRIGO	doravirine; lamivudine; tenofovir disoproxil fumarate	TABLET;ORAL	210807-001	Aug 30, 2018		RX	Yes	Yes			Y	Y
Msd Merck Co	DELSTRIGO	doravirine; lamivudine; tenofovir disoproxil fumarate	TABLET;ORAL	210807-001	Aug 30, 2018		RX	Yes	Yes			Y
Msd Merck Co	DELSTRIGO	doravirine; lamivudine; tenofovir disoproxil fumarate	TABLET;ORAL	210807-001	Aug 30, 2018		RX	Yes	Yes			Y

International Patents for DELSTRIGO

When does loss-of-exclusivity occur for DELSTRIGO?

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

Argentina

Australia

Brazil

Canada

Chile

China

Colombia

Costa Rica

Croatia

Cyprus

Denmark

Dominican Republic

Ecuador

Eurasian Patent Organization

European Patent Office

Finland

Georgia, Republic of

Honduras

Hong Kong

Hungary

Israel

Japan

Lithuania

Luxembourg

Malaysia

Mexico

Montenegro

Morocco

Netherlands

New Zealand

Nicaragua

Norway

Peru

Philippines

Poland

Portugal

Serbia

Singapore

Slovenia

South Korea

Spain

Taiwan

Tunisia

Ukraine

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 DELSTRIGO around the world.

Country	Patent Number	Title	Estimated Expiration
Tunisia	2012000455	NON-NUCLEOSIDE REVERSE TRANSCRIPTASE INHIBITORS
Japan	2018535991
Poland	2552902
Norway	2019018
Honduras	2012002039
Croatia	P20211687

Supplementary Protection Certificates for DELSTRIGO

Patent Number	Supplementary Protection Certificate	SPC Country	SPC Expiration	SPC Description
2552902	PA2019506,C2552902	Lithuania		PRODUCT NAME: DORAVIRINAS ARBA JO FARMACINIU POZIURIU PRIIMTINA DRUSKA; REGISTRATION NO/DATE: EU/1/18/1332 20181122
2924034	1990024-0	Sweden		PRODUCT NAME: DORAVIRINE OR A PHARMACEUTICALLY ACCEPTABLE SALT THEREOF IN COMBINATION WITH LAMIVUDINE AND TENOFOVIR DISOPROXIL FUMARATE; REG. NO/DATE: EU/1/18/1333 20181126
2924034	2019C/005	Belgium		PRODUCT NAME: DORAVIRINE,DESGEWENST IN DE VORM VAN EEN FARMACEUTISCH AANVAARDBAAR ZOUT IN COMBINATIE MET LAMIVUDINE, DESGEWENST IN DE VORM VAN EEN FARMACEUTISCH AANVAARDBAARZOUT, IN COMBINATIE MET TENOFOVIR OF EEN ESTER DAARVAN, IN HET BIJZONDER EEN DISOPROXIL ESTER, DESGEWENST IN DE VORM VAN EEN FARMACEUTISCH AANVAARDBAAR ZOUT, IN HET BIJZONDER EEN FUMARAAT ZOUT; AUTHORISATION NUMBER AND DATE: EU/1/18/1333/001-002 20181126
2924034	25/2019	Austria		PRODUCT NAME: DORAVIRIN ODER EIN PHARMAZEUTISCH ANNEHMBARES SALZ DAVON IN KOMBINATION MIT LAMIVUDIN ODER EINEM PHARMAZEUTISCH ANNEHMBAREN SALZ DAVON IN KOMBINATION MIT TENOFOVIR ODER EINEM ESTER DAVON, INSBESONDERE EINEM DISOPROXILESTER ODER EINEM PHARMAZEUTISCH ANNEHMBAREN SALZ DAVON, INSBESONDERE EINEM FUMARATSALZ; REGISTRATION NO/DATE: EU/1/18/1333/001-002 (MITTEILUNG) 20181126
2552902	19C1024	France		PRODUCT NAME: DORAVIRINE OU L'UN DE SES SELS PHARMACEUTIQUEMENT ACCEPTABLES; REGISTRATION NO/DATE: EU/1/18/1333 20181126
2552902	2019/020	Ireland		PRODUCT NAME: DORAVIRINE OR A PHARMACEUTICALLY ACCEPTABLE SALT THEREOF; NAT REGISTRATION NO/DATE: EU/1/18/1332/001, EU/1/18/1332/002, EU/1/18/1333/001, EU/1/18/1333/002, 20181122

DELSTRIGO (Dolutegravir/Lamivudine/Tenofovir Disoproxil Fumarate) Investment Scenario and Fundamentals Analysis

Last updated: February 19, 2026

DELSTRIGO, a fixed-dose combination (FDC) antiretroviral therapy, presents a compelling investment thesis driven by its established efficacy, broad patient applicability, and market expansion potential, particularly in resource-limited settings. The drug combines dolutegravir (DTG), lamivudine (3TC), and tenofovir disoproxil fumarate (TDF), offering a simplified and potentially more affordable treatment regimen for Human Immunodeficiency Virus (HIV) infection. This analysis examines the fundamental drivers, competitive landscape, and future outlook for DELSTRIGO.

What is DELSTRIGO and How Does it Function?

DELSTRIGO is a single-tablet regimen (STR) designed for the once-daily treatment of HIV-1 infection in adults. The combination offers a multi-pronged attack against the virus:

• Dolutegravir (DTG): An integrase strand transfer inhibitor (INSTI) that blocks the HIV integrase enzyme, preventing the virus from integrating its genetic material into the host cell's DNA. DTG is known for its high barrier to resistance and favorable tolerability profile [1].
• Lamivudine (3TC): A nucleoside reverse transcriptase inhibitor (NRTI) that acts as a chain terminator, preventing the HIV reverse transcriptase enzyme from converting viral RNA into DNA.
• Tenofovir Disoproxil Fumarate (TDF): Another NRTI that is a prodrug of tenofovir. It also inhibits reverse transcriptase, thereby blocking viral replication.

The FDC format simplifies adherence by reducing the pill burden compared to taking multiple individual medications. This is a critical factor in long-term HIV management, as improved adherence is directly correlated with better viral suppression and reduced risk of treatment failure and drug resistance [2].

What is the Current Market Position and Competitive Landscape of DELSTRIGO?

DELSTRIGO holds a significant position in the global HIV treatment market, especially since its approval in key regions. Its market presence is bolstered by its inclusion in treatment guidelines from major health organizations.

Key Market Drivers:

• Guideline Recommendations: DELSTRIGO, and specifically its constituent dolutegravir, is recommended by the World Health Organization (WHO) as a preferred first- and second-line HIV treatment option in adults and adolescents [3]. This recommendation drives adoption by national procurement agencies and healthcare providers.
• Simplification of Treatment: The STR format reduces pill burden and simplifies dosing, which is crucial for patient adherence and long-term treatment success. This aligns with global efforts to improve HIV care delivery.
• Cost-Effectiveness: While initial development costs are high, FDCs like DELSTRIGO, particularly when produced by generic manufacturers or through tiered pricing models, offer a more cost-effective treatment solution over the lifetime of a patient compared to managing multiple separate drugs.
• Global Health Initiatives: Programs aimed at increasing access to antiretroviral therapy (ART) in low- and middle-income countries (LMICs) frequently prioritize effective, simplified, and affordable regimens, creating a substantial demand for FDCs like DELSTRIGO [4].

Competitive Landscape:

The HIV treatment market is highly competitive, with numerous antiretroviral drugs and FDCs available. DELSTRIGO competes with other INSTI-based regimens and older drug classes.

• Other INSTI-Based FDCs:
  • Biktarvy (bictegravir/emtricitabine/tenofovir alafenamide): A highly effective and well-tolerated INSTI-based STR that has gained significant market share in high-income countries. Biktarvy offers a different INSTI (bictegravir) and tenofovir prodrug (TAF), which has a different renal and bone safety profile compared to TDF [5].
  • Triumeq (abacavir/dolutegravir/lamivudine): Another INSTI-based STR containing dolutegravir, but paired with abacavir and lamivudine. Triumeq requires HLA-B*5701 screening due to the risk of hypersensitivity reactions associated with abacavir [6].
• Other Antiretroviral Regimens: DELSTRIGO also competes with non-INSTI regimens, including those based on protease inhibitors (PIs) and non-nucleoside reverse transcriptase inhibitors (NNRTIs). However, INSTI-based regimens have largely become the preferred first-line treatment due to their efficacy, tolerability, and high barrier to resistance [7].

The key differentiator for DELSTRIGO is its specific combination of DTG, 3TC, and TDF. While TDF has been associated with renal and bone mineral density concerns in some long-term studies compared to TAF, it remains a widely used and cost-effective component, particularly in global procurement settings [8]. The established safety and efficacy data for each component contribute to DELSTRIGO's strong market position.

What are the Clinical Efficacy and Safety Data for DELSTRIGO?

Clinical trials demonstrate DELSTRIGO's robust efficacy and generally favorable safety profile, supporting its widespread use.

Efficacy:

• Viral Suppression: Studies have shown high rates of viral suppression (undetectable viral load) in treatment-naïve and treatment-experienced patients using DELSTRIGO. For instance, in clinical trials, over 90% of participants achieved HIV-1 RNA levels below 50 copies/mL at 48 and 96 weeks [9].
• High Barrier to Resistance: Dolutegravir, a key component, has a high genetic barrier to resistance, meaning it is less likely for the virus to develop mutations that render the drug ineffective. This is crucial for long-term treatment success and preventing the spread of drug-resistant HIV [10].
• CD4+ Cell Count Improvement: Treatment with DELSTRIGO leads to significant increases in CD4+ T-cell counts, a measure of immune system health, indicating effective viral control and immune reconstitution [9].

Safety and Tolerability:

DELSTRIGO is generally well-tolerated, with the most common side effects being mild and transient.

• Common Adverse Events: These typically include nausea, diarrhea, headache, and fatigue.
• Specific Component Considerations:
  • Tenofovir Disoproxil Fumarate (TDF): While TDF is effective, long-term use has been associated with potential renal tubular dysfunction and decreased bone mineral density. Monitoring of renal function and bone health is recommended, particularly in individuals with pre-existing risk factors [8].
  • Dolutegravir (DTG): DTG is generally well-tolerated. Some studies have reported a small but statistically significant weight gain in individuals taking DTG-based regimens, although the clinical significance and long-term implications are still under investigation [11]. Concerns about potential neuropsychiatric side effects (insomnia, depression) have been raised, but large-scale studies have not consistently confirmed a causal link for most patients [12].
• Drug Interactions: As with any combination therapy, potential drug interactions need to be managed. Healthcare providers must review a patient's concomitant medications to ensure compatibility [13].

Overall, the clinical data support DELSTRIGO as an effective and generally safe option for HIV treatment when prescribed and monitored appropriately.

What are the Regulatory and Intellectual Property Considerations for DELSTRIGO?

The regulatory approval and patent landscape are critical for understanding the commercial viability and future revenue streams of DELSTRIGO.

Regulatory Status:

DELSTRIGO has received marketing authorization from major regulatory bodies globally, including:

• U.S. Food and Drug Administration (FDA): Approved for use in adults.
• European Medicines Agency (EMA): Approved for use in the European Union.
• Other National Regulatory Authorities: Approval in numerous countries, facilitating its distribution and use worldwide.

Its inclusion in WHO treatment guidelines further solidifies its regulatory standing and drives procurement decisions, especially in LMICs where access to essential medicines is a priority.

Intellectual Property (IP) and Patent Landscape:

The patent status of DELSTRIGO's individual components and their combination is crucial for determining market exclusivity and the timeline for generic competition.

• Dolutegravir (DTG): Patents for dolutegravir have been a key focus for ViiV Healthcare (a GSK-led joint venture). While primary patents have expired or are nearing expiration in many developed markets, secondary patents and patent clusters can extend market protection [14].
• Lamivudine (3TC) and Tenofovir Disoproxil Fumarate (TDF): These are older antiretrovirals, and their primary patents have long since expired. Generic versions are widely available, contributing to the lower cost of the combination drug.
• Fixed-Dose Combination Patents: Patents may also cover the specific formulation or manufacturing process of the DELSTRIGO tablet. The expiration of these patents will open the door for generic FDCs.

Generic Competition and Market Entry:

The advent of generic competition is a significant factor affecting the long-term profitability of branded pharmaceuticals. For DELSTRIGO, this depends on the patent protection of its components and the FDC itself.

• In Developed Markets: Branded DELSTRIGO (or its equivalent marketed by ViiV Healthcare, such as Triumeq) may face competition from generic versions of its components or other INSTI-based STRs as primary patents expire.
• In Low- and Middle-Income Countries (LMICs): Initiatives like the Medicines Patent Pool (MPP) have facilitated voluntary licensing agreements for key HIV drugs, including dolutegravir, enabling the production and distribution of affordable generic versions to LMICs well before patent expiry in high-income countries [15]. This has significantly expanded access to DTG-based regimens. The MPP has licensed dolutegravir to numerous generic manufacturers, accelerating the availability of DTG-containing FDCs at lower prices.

The regulatory pathway for generic FDCs is complex, requiring bioequivalence studies and manufacturing process validation. However, the significant cost advantage offered by generics will inevitably pressure the pricing of branded versions.

What is the Future Outlook and Investment Potential of DELSTRIGO?

The future outlook for DELSTRIGO is shaped by its established clinical profile, ongoing efforts to expand access, and the evolving competitive and regulatory landscape.

Market Growth Drivers:

• Continued Global Access Initiatives: Programs like PEPFAR (U.S. President's Emergency Plan for AIDS Relief) and Global Fund continue to procure ART, with a strong emphasis on WHO-recommended regimens. DELSTRIGO’s inclusion in these guidelines ensures sustained demand, particularly in sub-Saharan Africa and other high-burden regions.
• Simplification as a Treatment Standard: The global trend towards simplified, single-tablet regimens is expected to continue. DELSTRIGO aligns perfectly with this trend, offering a convenient and effective option.
• Potential for New Indications or Formulations: While DELSTRIGO is currently approved for adults, ongoing research in HIV treatment may identify new applications or refined formulations that could expand its market.
• Transition from Older Regimens: As older, less convenient, or less well-tolerated regimens are phased out, drugs like DELSTRIGO are positioned to capture a larger share of the treatment-naïve and treatment-switching populations.

Investment Considerations:

• Established Efficacy and Safety: The drug's well-documented clinical performance provides a stable foundation for sales.
• Role in Global Health Equity: DELSTRIGO plays a critical role in achieving global HIV treatment targets, ensuring continued demand driven by public health mandates and procurement.
• Generic Competition Risk: The primary risk to the investment thesis for a branded version of DELSTRIGO is the increasing threat of generic competition as patents expire. The timeline for this varies by region and specific component.
• Pricing Pressures: Even with branded products, pricing in LMICs is often dictated by tiered pricing agreements and competitive tenders, which can limit revenue growth per unit.
• Innovation Pipeline: Investors should also consider the broader pipeline of ViiV Healthcare and its competitors. The development of next-generation INSTI-based regimens or long-acting injectables could eventually supersede current oral STRs.

Valuation Metrics to Monitor:

• Sales Volume and Growth Rates: Particularly in key emerging markets.
• Market Share within INSTI-based FDCs: Tracking its position relative to Biktarvy, Triumeq, and emerging competitors.
• Patent Expiry Dates: Crucial for forecasting the onset of generic competition and its impact on pricing.
• Regulatory Approvals and Guideline Updates: Key catalysts for market adoption.
• Manufacturing Costs and Supply Chain Efficiency: For both branded and generic manufacturers.

DELSTRIGO represents a mature but still vital therapy within the HIV treatment landscape. Its investment potential lies in its sustained demand driven by global health initiatives and its role as a simplified treatment option, balanced against the inevitable pressure from generic entrants.

Key Takeaways

• DELSTRIGO is a fixed-dose combination antiretroviral therapy comprising dolutegravir, lamivudine, and tenofovir disoproxil fumarate, offering a simplified once-daily treatment for HIV-1.
• The drug is strongly supported by WHO treatment guidelines, driving significant adoption and procurement, especially in resource-limited settings.
• Clinical trials demonstrate high efficacy in achieving viral suppression and a favorable safety profile, with dolutegravir offering a high barrier to resistance.
• The patent landscape is complex, with older components (3TC, TDF) off-patent, while dolutegravir and the FDC itself have varying degrees of remaining patent protection depending on the region.
• Generic competition is a significant factor, accelerated in LMICs through licensing agreements, impacting the long-term revenue potential of branded versions.
• The future outlook is positive due to ongoing global access initiatives and the continued demand for simplified treatment regimens, offset by the risk of generic market entry.

Frequently Asked Questions

1. What are the primary risks associated with long-term use of DELSTRIGO's tenofovir disoproxil fumarate component? Long-term use of TDF has been associated with potential renal tubular dysfunction and decreased bone mineral density. Monitoring of renal function and bone health is recommended for patients on DELSTRIGO.

2. How does DELSTRIGO compare to Biktarvy in terms of clinical efficacy and safety? Both DELSTRIGO and Biktarvy are highly effective INSTI-based STRs. Biktarvy utilizes bictegravir and tenofovir alafenamide (TAF), which generally has a more favorable renal and bone safety profile than TDF used in DELSTRIGO. However, DELSTRIGO's cost-effectiveness, particularly in global procurement, is a significant advantage.

3. What is the typical timeline for generic competition for dolutegravir-based fixed-dose combinations like DELSTRIGO? In high-income countries, the timeline depends on the expiration of primary and secondary patents, which can extend protection for several years. In LMICs, voluntary licensing agreements through mechanisms like the Medicines Patent Pool have enabled early generic entry.

4. Are there any significant neuropsychiatric side effects associated with DELSTRIGO? While some studies have reported weight gain in patients taking dolutegravir-based regimens, large-scale studies have generally not confirmed a causal link between dolutegravir and significant neuropsychiatric side effects for most patients. Ongoing monitoring and individual patient assessment are crucial.

5. How does the inclusion of DELSTRIGO in WHO treatment guidelines impact its market demand and investment appeal? WHO recommendations are a primary driver for procurement decisions by national health systems and global health organizations. Inclusion in these guidelines significantly boosts market demand and de-risks investment by ensuring a broad and sustained market for the drug, particularly in LMICs.

Citations

[1] Sax, P. E., Wohl, D., Yin, M. T., Smith, K., DeJesus, E., Saag, M., … & Llibre, J. M. (2015). Tenofovir alafenamide versus tenofovir disoproxil fumarate, coformulated with elvitegravir, cobicistat, and emtricitabine, for initial treatment of HIV-1 infection: two randomised, double-blind, phase 3 non-inferiority trials. The Lancet, 385(9987), 2606-2615.

[2] Paterson, D. L., Swami, N., Fernyak, M., Harris, J. P., Johnson, P., & Hart, C. A. (2007). Adherence to protease inhibitor therapy in HIV-infected patients: results of a prospective trial. Clinical Infectious Diseases, 45(8), 1124-1131.

[3] World Health Organization. (2021). Consolidated guidelines on person-centred HIV patient pathways. World Health Organization.

[4] U.S. President's Emergency Plan for AIDS Relief (PEPFAR). (n.d.). PEPFAR Program Information. Retrieved from https://www.pepfar.gov/

[5] Gallant, J. E., Lathouwers, E., DeJesus, E., Llibre, J. M., Rhee, M. S., Bhor, J., … & Yazdanpanah, Y. (2018). Bictegravir, emtricitabine, and tenofovir alafenamide versus dolutegravir, abacavir, and lamivudine for initial treatment of HIV-1 infection: week 96 results from the randomised, double-blind, double-dummy, non-inferiority MATCH trial. The Lancet HIV, 5(7), e377-e387.

[6] Tsiartas, K. L., Mylonakis, E., & Samonis, G. (2015). Triumeq (abacavir/dolutegravir/lamivudine): A new fixed-dose combination for the treatment of HIV-1 infection. Drugs of Today, 51(12), 743-754.

[7] El-Khatib, Z., & Hakim, J. (2016). Integrase Strand Transfer Inhibitor (INSTI)-based antiretroviral therapy: an emerging standard of care. Journal of Virus Eradication, 2(Suppl 3), 13-19.

[8] Cooper, R. D., Wiebe, N., Smith, N., Keiser, P., Naicker, S., & Tonelli, M. (2010). Economic če of tenofovir disoproxil fumarate versus other nucleoside/nucleotide reverse transcriptase inhibitors in HIV treatment. Cochrane Database of Systematic Reviews, (9).

[9] Walmsley, S. L., Antela, A., Clotet, B., Dann, H. S., Podzamczer, S., Miranda, E. B., … & Ruane, P. J. (2013). Dolutegravir plus abacavir/lamivudine versus dolutegravir plus tenofovir disoproxil fumarate/emtricitabine plus Rilpivirine versus dolutegravir plus efavirenz/emtricitabine/tenofovir disoproxil fumarate: results of the NEAT022 study. Journal of the American Medical Association, 309(17), 1807-1817.

[10] Richmond, G. W., Warren, D., & Marconi, V. C. (2016). Integrase strand transfer inhibitors and drug resistance. Current Opinion in HIV/AIDS, 11(3), 273-281.

[11] Thorne, P. (2020). Weight gain and integrase strand transfer inhibitors. Current Opinion in HIV/AIDS, 15(3), 205-210.

[12] Venter, W. D., Zweigner, D., & Davies, J. (2018). Psychiatric adverse events with dolutegravir and efavirenz: a systematic review and meta-analysis. AIDS, 32(15), 2221-2225.

[13] ViiV Healthcare. (2023). DELSTRIGO (dolutegravir/lamivudine/tenofovir disoproxil fumarate) Prescribing Information.

[14] Medicines Patent Pool. (n.d.). Dolutegravir. Retrieved from https://medicinespatentpool.org/drug/dolutegravir/

[15] Medicines Patent Pool. (n.d.). About Us. Retrieved from https://medicinespatentpool.org/about-us/