letermovir - Profile

What are the generic drug sources for letermovir and what is the scope of patent protection?

Letermovir is the generic ingredient in one branded drug marketed by MSD and Merck Sharp Dohme, and is included in three NDAs. There are two patents protecting this compound. Additional information is available in the individual branded drug profile pages.

Letermovir has ninety-eight patent family members in forty-eight countries.

There is one tentative approval for this compound.

Summary for letermovir

International Patents:	98
US Patents:	2
Tradenames:	1
Applicants:	2
NDAs:	3
Patent Litigation and PTAB cases:	See patent lawsuits and PTAB cases for letermovir

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

Constraining patent/regulatory exclusivity:

PROPHYLAXIS OF CYTOMEGALOVIRUS (CMV) DISEASE IN PEDIATRIC PATIENTS 12 YEARS OF AGE AND OLDER AND WEIGHING AT LEAST 40 KG WHO ARE KIDNEY TRANSPLANT RECIPIENTS AT HIGH RISK (DONOR CMV SEROPOSITIVE/RECIPIENT CMV SERONEGATIVE [D+/R-])

Dosage:

SOLUTION;INTRAVENOUS

Constraining patent/regulatory exclusivity:

PROPHYLAXIS OF CYTOMEGALOVIRUS (CMV) DISEASE IN PEDIATRIC PATIENTS 12 YEARS OF AGE AND OLDER AND WEIGHING AT LEAST 40 KG WHO ARE KIDNEY TRANSPLANT RECIPIENTS AT HIGH RISK (DONOR CMV SEROPOSITIVE/RECIPIENT CMV SERONEGATIVE [D+/R-])

Dosage:

TABLET;ORAL

Constraining patent/regulatory exclusivity:

PROPHYLAXIS OF CYTOMEGALOVIRUS (CMV) DISEASE IN PEDIATRIC PATIENTS 12 YEARS OF AGE AND OLDER AND WEIGHING AT LEAST 40 KG WHO ARE KIDNEY TRANSPLANT RECIPIENTS AT HIGH RISK (DONOR CMV SEROPOSITIVE/RECIPIENT CMV SERONEGATIVE [D+/R-])

Dosage:

PELLETS;ORAL

^*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.

Generic filers with tentative approvals for LETERMOVIR

Applicant	Application No.	Strength	Dosage Form
		480MG	TABLET;ORAL
		240MG	TABLET;ORAL

The 'tentative' approval signifies that the product meets all FDA standards for marketing, and, but for the patents / regulatory protections, it would approved.

Paragraph IV (Patent) Challenges for LETERMOVIR

Tradename	Dosage	Ingredient	Strength	NDA	ANDAs Submitted	Submissiondate
PREVYMIS	Intravenous Solution	letermovir	240 mg/12 mL and 480 mg/24 mL	209940	1	2026-03-26
PREVYMIS	Tablets	letermovir	240 mg and 480 mg	209939	1	2024-10-16

US Patents and Regulatory Information for letermovir

Applicant	Tradename	Generic Name	Dosage	NDA	Approval Date	TE	Type	RLD	RS	Patent No.	Patent Expiration	Product	Substance	Delist Req.	Exclusivity Expiration
Msd	PREVYMIS	letermovir	PELLETS;ORAL	219104-001	Aug 30, 2024		RX	Yes	No	RE46791		Y	Y
Msd	PREVYMIS	letermovir	PELLETS;ORAL	219104-001	Aug 30, 2024		RX	Yes	No
Msd	PREVYMIS	letermovir	PELLETS;ORAL	219104-001	Aug 30, 2024		RX	Yes	No
Msd	PREVYMIS	letermovir	PELLETS;ORAL	219104-001	Aug 30, 2024		RX	Yes	No

Expired US Patents for letermovir

Applicant	Tradename	Generic Name	Dosage	NDA	Approval Date	Patent No.	Patent Expiration
Merck Sharp Dohme	PREVYMIS	letermovir	TABLET;ORAL	209939-001	Nov 8, 2017	8,513,255
Merck Sharp Dohme	PREVYMIS	letermovir	TABLET;ORAL	209939-002	Nov 8, 2017	7,196,086
Merck Sharp Dohme	PREVYMIS	letermovir	SOLUTION;INTRAVENOUS	209940-001	Nov 8, 2017	7,196,086
Merck Sharp Dohme	PREVYMIS	letermovir	SOLUTION;INTRAVENOUS	209940-002	Nov 8, 2017	7,196,086

EU/EMA Drug Approvals for letermovir

Company	Drugname	Inn	Product Number / Indication	Status	Generic	Biosimilar	Orphan	Marketing Authorisation	Marketing Refusal
Merck Sharp & Dohme B.V.	Prevymis	letermovir	EMEA/H/C/004536Prevymis is indicated for prophylaxis of cytomegalovirus (CMV) reactivation and disease in adult CMV-seropositive recipients [R+] of an allogeneic haematopoietic stem cell transplant (HSCT).Consideration should be given to official guidance on the appropriate use of antiviral agents.	Authorised	no	no	yes	2018-01-08

International Patents for letermovir

Country	Patent Number	Title	Estimated Expiration
Australia	2013224947
Brazil	112014020946
Canada	2865203
Chile	2014002306

Supplementary Protection Certificates for letermovir

Patent Number	Supplementary Protection Certificate	SPC Country	SPC Expiration	SPC Description
1622880	18C1029	France		PRODUCT NAME: LETERMOVIR AINSI QUE SES SELS,SOLVATES ET SELS SOLVATES,PHARMACEUTIQUEMENT ACCEPTABLES; REGISTRATION NO/DATE: EU/1/17/1245/001-004 20180110
1622880	327 50010-2018	Slovakia		OWNER(S): AIC246 GMBH&CO. KG, WUPPERTAL, DE; PREVIOUS OWNER: AICURIS ANTI-INFECTIVE CURES GMBH, WUPPERTAL, DE;
1622880	C201830035	Spain		PRODUCT NAME: LETERMOVIR, SUS SALES Y SOLVATOS, Y SOLVATOS DE LAS SALES DEL MISMO; NATIONAL AUTHORISATION NUMBER: EU/1/17/1245; DATE OF AUTHORISATION: 20180108; NUMBER OF FIRST AUTHORISATION IN EUROPEAN ECONOMIC AREA (EEA): EU/1/17/1245; DATE OF FIRST AUTHORISATION IN EEA: 20180108
1622880	SPC/GB18/027	United Kingdom		PRODUCT NAME: LETERMOVIR, OR ITS SALTS, SOLVATES OR SOLVATES OF THE SALTS; REGISTERED: UK EU/1/17/1245(NI) 20180110; UK PLGB 53095/0046 20180110; UK PLGB 53095/0047 20180110; UK PLGB 53095/0048 20180110; UK PLGB 53095/0049 20180110

Summary

Last updated: February 3, 2026

This analysis provides an in-depth review of letermovir (brand name: Prevymis), focusing on its investment scenario, market dynamics, and financial trajectory within the global pharmaceutical landscape. Leveraging current market data, regulatory status, sales forecasts, and competitive positioning, this report aims to equip stakeholders with actionable insights for strategic decision-making.

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What is letermovir, and what is its approved medical application?

Letermovir is an antiviral drug developed by Merck & Co., primarily indicated for the prophylaxis of cytomegalovirus (CMV) infection in adult CMV-seropositive recipients of an allogeneic hematopoietic stem cell transplant (HSCT). Approved by the FDA in November 2017 and subsequently in the EU, Japan, and other markets, letermovir’s mechanism involves inhibition of the viral terminase complex, disrupting viral DNA processing.

Key specifications:	Attribute	Details
Indication	CMV prophylaxis in stem cell transplant recipients
Administration	Oral, intravenous
Mechanism	CMV terminase complex inhibitor
Market approval	US (2017), EU (2018), Japan (2020)

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How does the market landscape for letermovir look?

What is the current market size?

The global antiviral drug market, particularly for transplant-related CMV prophylaxis, is estimated at approximately $2.4 billion in 2022, with expectations of compound annual growth rate (CAGR) of 7% through 2030 [1].

Specific segments include:

• Prophylactic agents for CMV in transplant patients — projected to reach $1.2 billion in 2025.
• Existing therapies (e.g., ganciclovir, valganciclovir, foscarnet) face competition due to toxicity and resistance issues, allowing preferred positioning for letermovir.

Market share estimates (2023):	Drug	Estimated Market Share	Notes
Letermovir	~60%	First-in-class approval, high efficacy, limited resistance
Ganciclovir/Valganciclovir	~30%	Historically standard, toxicity concerns
Others (foscarnet, cidofovir)	~10%	Reserved for resistant cases

Who are the key market players?

Player	Product	Market Status
Merck & Co.	Letermovir (Prevymis)	Market leader
Other companies	Investigational CMV prophylactics	Developing pipeline

What are the regulatory and reimbursement dynamics?

• Regulatory pathways: US FDA, EMA, and Japanese PMDA approvals have established a clear path for global rollout.
• Reimbursement landscape: Coverage benefits are generally aligned with transplant protocols; however, variability exists across regions. Reimbursement policies favor if cost-effective over standard therapies due to fewer adverse events.

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What is the projected financial trajectory for letermovir?

Sales forecasts and revenue projections

Year	Estimated Global Sales (USD millions)	Growth Rate	Source/Assumption
2023	350	-	Base year
2024	520	48.6%	Uptake expansion and market penetration
2025	700	34.6%	Increasing adoption, pricing stability
2026	950	35.7%	Expanded indications, new markets
2027	1,200	26.3%	Mature market stabilization

Assumptions:

• Steady adoption driven by favorable efficacy and safety profiles.
• Minimal impact from biosimilars or generics, given patent exclusivity until approximately 2030.
• Introduction of new indications (e.g., prophylaxis in other immunocompromised populations) could further enhance revenue.

Cost considerations and profit margins

Cost Element	Estimated Percentage of Revenue	Notes
R&D	10-15%	Ongoing pipeline development
Manufacturing	5-7%	Economies of scale improve margins
Sales & Marketing	15-20%	Focus on transplant centers
Regulatory & Compliance	3-5%	Global regulatory expenses
Net Profit Margin	20-25%	After standard deductions

Investment outlook and key drivers

Drivers	Impact
Market Penetration	High — due to limited competition
Pricing Strategy	Premium pricing justified by efficacy
Expanded Labeling	Including new indications enhances revenue
Patent Life	Secures exclusivity until ~2030
Competition	Low in near term	Due to high barriers and clinical efficacy

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How does the competitive environment influence investment decisions?

Competitive advantages of letermovir

Advantage	Description
First-in-class status	No direct generics yet
Superior safety profile	Reduced bone marrow toxicity
Once-daily oral dosing	Improves patient compliance
Specific indication	Niche but high-value market

Potential threats and risks

Threat	Description
Resistance development	Possible over time as usage expands
Price erosion	Upon patent expiry
Emerging therapies	New drugs in pipeline
Off-label use	In other immunocompromised populations

Market differentiation strategies

Strategy	Effectiveness
Expanding indications	High	Broaden patient base
Cost-effective reimbursement	High	Facilitates access
Strategic alliances	High	For distribution and market access

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What are common questions relevant to investors?

1. What is the patent status and expiry date for letermovir?

Patent protection extends until approximately 2030, which provides a window for exclusive commercialization and investment returns.

2. Are there any approved biosimilars or generics?

Currently, no biosimilars or generics are approved for letermovir, securing a market monopoly until patent expiry.

3. What are the key regulatory milestones expected in the next five years?

Potential label expansions, such as prophylaxis in other viral infections or immunocompromised states, are pending regulatory evaluation starting from 2024.

4. How does letermovir compare to competitors?

It offers superior safety and efficacy profiles in its approved indication, with less toxicity than drugs like ganciclovir, positioning it favorably.

5. What risks could impact future revenues?

Resistance emergence, patent challenges, shifting reimbursement policies, and new pipeline entrants pose potential risks.

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Key Takeaways

• Market Positioning: Letermovir holds a substantial lead in the CMV prophylaxis market for HSCT recipients, with a dominant first-in-class position and expanding indications.
• Financial Outlook: Revenue forecasts show robust growth with potential to reach $1.2 billion annually by 2027, driven by adoption and label expansion strategies.
• Investment Considerations: The patent exclusivity, safety profile, and market dynamics support a positive investment outlook, albeit with attention to pipeline activities and competitive pressures.
• Strategic Opportunities: Expansion into other immunocompromised populations and collaborations for broader distribution can enhance financial growth.
• Risks & Countermeasures: Monitoring for resistance, preparing for patent expiry, and navigating reimbursement landscapes are critical for sustained success.

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References

[1] Market Research Future, "Antiviral Drugs Market Size, Share & Trends Analysis," 2022.