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Last Updated: December 15, 2025

SINEQUAN Drug Patent Profile


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

Sinequan is a drug marketed by Pfizer and is included in two NDAs.

The generic ingredient in SINEQUAN is doxepin hydrochloride. There are seven drug master file entries for this compound. Forty-nine suppliers are listed for this compound. Additional details are available on the doxepin hydrochloride profile page.

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Summary for SINEQUAN
Drug patent expirations by year for SINEQUAN
Recent Clinical Trials for SINEQUAN

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

SponsorPhase
University of BalamandPhase 4
National Cancer Institute (NCI)Phase 2
Mayo ClinicPhase 2

See all SINEQUAN clinical trials

US Patents and Regulatory Information for SINEQUAN

Applicant Tradename Generic Name Dosage NDA Approval Date TE Type RLD RS Patent No. Patent Expiration Product Substance Delist Req. Exclusivity Expiration
Pfizer SINEQUAN doxepin hydrochloride CAPSULE;ORAL 016798-003 Approved Prior to Jan 1, 1982 DISCN Yes No ⤷  Get Started Free ⤷  Get Started Free ⤷  Get Started Free
Pfizer SINEQUAN doxepin hydrochloride CONCENTRATE;ORAL 017516-001 Approved Prior to Jan 1, 1982 DISCN Yes No ⤷  Get Started Free ⤷  Get Started Free ⤷  Get Started Free
Pfizer SINEQUAN doxepin hydrochloride CAPSULE;ORAL 016798-006 Approved Prior to Jan 1, 1982 DISCN Yes No ⤷  Get Started Free ⤷  Get Started Free ⤷  Get Started Free
Pfizer SINEQUAN doxepin hydrochloride CAPSULE;ORAL 016798-001 Approved Prior to Jan 1, 1982 DISCN Yes No ⤷  Get Started Free ⤷  Get Started Free ⤷  Get Started Free
Pfizer SINEQUAN doxepin hydrochloride CAPSULE;ORAL 016798-002 Approved Prior to Jan 1, 1982 DISCN Yes No ⤷  Get Started Free ⤷  Get Started Free ⤷  Get Started Free
>Applicant >Tradename >Generic Name >Dosage >NDA >Approval Date >TE >Type >RLD >RS >Patent No. >Patent Expiration >Product >Substance >Delist Req. >Exclusivity Expiration

Expired US Patents for SINEQUAN

Applicant Tradename Generic Name Dosage NDA Approval Date Patent No. Patent Expiration
Pfizer SINEQUAN doxepin hydrochloride CAPSULE;ORAL 016798-005 Approved Prior to Jan 1, 1982 ⤷  Get Started Free ⤷  Get Started Free
Pfizer SINEQUAN doxepin hydrochloride CAPSULE;ORAL 016798-003 Approved Prior to Jan 1, 1982 ⤷  Get Started Free ⤷  Get Started Free
Pfizer SINEQUAN doxepin hydrochloride CONCENTRATE;ORAL 017516-001 Approved Prior to Jan 1, 1982 ⤷  Get Started Free ⤷  Get Started Free
Pfizer SINEQUAN doxepin hydrochloride CAPSULE;ORAL 016798-007 Approved Prior to Jan 1, 1982 ⤷  Get Started Free ⤷  Get Started Free
Pfizer SINEQUAN doxepin hydrochloride CAPSULE;ORAL 016798-006 Approved Prior to Jan 1, 1982 ⤷  Get Started Free ⤷  Get Started Free
>Applicant >Tradename >Generic Name >Dosage >NDA >Approval Date >Patent No. >Patent Expiration

Market Dynamics and Financial Trajectory for SINEQUAN (Levoleucovorin)

Last updated: July 30, 2025


Introduction

SINEQUAN (Levoleucovorin) stands as a pivotal adjunct in oncology, primarily used to enhance the efficacy of chemotherapeutic agents such as fluorouracil (5-FU) and mitigate their toxicities. Positioned within the broader landscape of supportive cancer care, SINEQUAN's market trajectory is shaped by evolving treatment paradigms, competitive positioning, regulatory developments, and the nuances of pharmaceutical innovation. This analysis delineates the current market dynamics and projects the financial outlook of SINEQUAN over the coming years.


Pharmacological Profile and Clinical Applications

Levoleucovorin, the active enantiomer of leucovorin, offers a targeted mechanism to potentiate chemotherapeutic effects, particularly in colorectal cancer, gastric cancers, and certain hematologic malignancies. Its role as a folinic acid derivative makes it integral in combination regimens, such as with 5-FU in metastatic colorectal cancer [1]. The drug’s clinical niche is reinforced by its specificity, efficacy, and relatively favorable safety profile, which are critical factors influencing market adoption.


Market Landscape and Key Players

1. Competitive Environment

SINEQUAN operates in a segment characterized by both branded and generic folinic acid formulations. Its primary competitors include:

  • Generic Leucovorin formulations: Widespread due to cost advantages.
  • Other branded folinic acid products: Such as fosfomycin-based alternatives and novel derivatives.

Despite the presence of generics, SINEQUAN maintains a competitive edge through its established manufacturer relationships, proven efficacy, and regulatory approvals.

2. Regulatory and Reimbursement Factors

Regulatory bodies like the FDA have approved SINEQUAN for specific indications, reinforcing its clinical credibility. Reimbursement coverage significantly benefits market penetration, especially in healthcare systems emphasizing evidence-based supportive care. Payer policies can influence adoption rates, particularly when cost-effectiveness analyses favor branded formulations in complex regimens.


Factors Influencing Market Dynamics

1. Clinical Guidelines and Treatment Adoption

Guidelines from organizations such as NCCN and ESMO endorse folinic acid's use in colorectal and gastric cancers, sustaining demand. As personalized medicine advances, there is a growing emphasis on optimized supportive care agents, which favors drugs like SINEQUAN.

2. Evolving Oncology Treatment Landscape

The integration of targeted therapies and immunotherapies is transforming oncology treatment. While these novel agents may occasionally replace traditional chemotherapy regimens, supportive drugs like SINEQUAN remain essential in combination therapies, particularly where clinical evidence supports their efficacy.

3. Patent Status and Generic Competition

Currently, SINEQUAN benefits from patent protections and market exclusivity in key jurisdictions. However, patent expirations could lead to increased generic competition, exerting downward pressure on pricing and profit margins.

4. Manufacturing and Supply Chain Factors

Reliable manufacturing scale and supply chain stability are crucial to meet global demand, especially given the drug’s importance in supportive care. Disruptions could impact availability and revenue.


Financial Trajectory and Revenue Projections

1. Revenue Trends

The global market for folinic acid formulations was valued at approximately USD 500 million in 2022, with a projected compound annual growth rate (CAGR) of 4-6% over the next five years [2]. SINEQUAN's contribution is driven by:

  • Steady adoption in developed markets.
  • Increasing use in emerging markets due to expanding cancer incidence.
  • Institutional preference for branded formulations in specific countries.

2. Growth Drivers

  • Expansion into new indications: Ongoing clinical trials exploring SINEQUAN in non-oncology supportive care could diversify revenue.
  • Market penetration in emerging economies: Rising healthcare expenditure and cancer prevalence in Asia-Pacific, Latin America, and Africa bolster growth prospects.
  • Regulatory approvals for biosimilars or patents extensions: Could sustain or enhance market share.

3. Challenges and Risks

  • Price erosion due to generics: As patents expire or licensing agreements evolve, competition will intensify.
  • Market consolidation or alternative therapies: Adoption of newer targeted agents might reduce reliance on supportive care drugs.
  • Regulatory hurdles: Delay or denial of approvals for new indications could limit growth.

4. Financial Projections

Assuming current market share stabilizes, SINEQUAN could see revenues grow modestly, reaching USD 200-300 million globally by 2028. The growth rate remains contingent on patent protections, emerging indications, and market expansion efforts. Pharmacoeconomic validation in different healthcare systems will be instrumental to sustain and grow revenue streams.


Strategic Considerations

  • Product differentiation: Emphasizing pharmacokinetic advantages and proven clinical outcomes over generics.
  • Partnerships: Collaborating with regional distributors to increase market penetration.
  • Pipeline development: Investing in research for new combination therapies or formulations to extend patent life and expand indications.

Conclusion

SINEQUAN occupies a stable niche within supportive oncology, with a trajectory buoyed by ongoing clinical use, healthcare system integration, and geographic expansion. Its future financial performance hinges on patent management, competitive positioning against generics, and the broader shifts in oncology treatment. Proactive strategic management and continued clinical validation will be key to maximizing its market potential.


Key Takeaways

  • SINEQUAN benefits from a well-established role as an adjunct in chemotherapy, with continued demand driven by clinical guidelines.
  • Market growth is aligned with the broader folinic acid segment, projected to grow at around 4-6% CAGR, with potential acceleration through geographic expansion.
  • Patent expirations and generic competition pose significant risks but can be mitigated through innovation and strategic alliances.
  • Reimbursement policies and clinical adoption influence revenue streams; thus, pharmacoeconomic evidence remains vital.
  • Diversification into new indications and formulations could extend product lifecycle and bolster long-term profitability.

FAQs

1. Is SINEQUAN losing market share to generic leucovorin products?
While generic versions are more cost-effective and gaining popularity, SINEQUAN maintains a competitive position due to its established clinical efficacy, regulatory approvals, and manufacturer reputation. Market share shifts depend on regional patent protections and reimbursement policies.

2. What are the key factors influencing SINEQUAN’s revenue growth?
Major factors include clinical guideline adoption, geographic expansion, patent protection duration, reimbursement framework, and the emergence of new therapeutic indications.

3. How might emerging biosimilars impact SINEQUAN’s market?
Although biosimilars often target biologic agents, their emergence in supportive care drugs like folinic acid is limited. Nevertheless, increased competition from lower-cost generics remains a primary concern.

4. What future developments could enhance SINEQUAN’s market position?
Development of novel formulations, new combination regimens supported by clinical trials, and expansion into alternative therapeutic areas could strengthen its market presence.

5. Are there any regulatory hurdles that could impede SINEQUAN’s growth?
Potential hurdles include delays in approval for new indications, patent disputes, and changes in regional drug approval policies, which could temporarily restrict market access.


References

[1] NCCN Clinical Practice Guidelines in Oncology. Colon Cancer. Version 3.2023. NCCN.org.

[2] Global Market Insights. Folinic Acid Market Size and Industry Analysis. 2022.

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