Investigational Drug Information for Clemizole

What is the drug development status for Clemizole?

Clemizole is an investigational drug.

There have been 4 clinical trials for Clemizole. The most recent clinical trial was a Phase 1 trial, which was initiated on February 1^st 2022.

The most common disease conditions in clinical trials are Epilepsies, Myoclonic, Syndrome, and Hepatitis C. The leading clinical trial sponsors are Epygenix, Eiger BioPharmaceuticals, and GreenLight Clinical PTY LTD.

There are five hundred and ninety-three US patents protecting this investigational drug and zero international patents.

Summary for Clemizole

US Patents	593
International Patents	3,818
US Patent Applications	1,617
WIPO Patent Applications	761
Japanese Patent Applications	337
Clinical Trial Progress	Phase 1 (2022-02-01)
Vendors	54

Recent Clinical Trials for Clemizole

Title	Sponsor	Phase
EPX-100 (Clemizole Hydrochloride) as Adjunctive Therapy in Children With Lennox Gastaut Syndrome.	Epygenix	Phase 2
EPX-100 (Clemizole Hydrochloride) as Add-on Therapy to Control Convulsive Seizures in Patients With Dravet Syndrome	GreenLight Clinical PTY LTD	Phase 2
EPX-100 (Clemizole Hydrochloride) as Add-on Therapy to Control Convulsive Seizures in Patients With Dravet Syndrome	Epygenix	Phase 2

See all Clemizole clinical trials

Clinical Trial Summary for Clemizole

Top disease conditions for Clemizole

Top clinical trial sponsors for Clemizole

See all Clemizole clinical trials

US Patents for Clemizole

Drugname	Patent Number	Patent Title	Patent Assignee	Estimated Expiration
Clemizole		Heterocyclic compound	Takeda Pharmaceutical Company Limited (Osaka, JP)
Clemizole		.beta.-D-2'-deoxy-2'-.alpha.-fluoro-2'-.beta.-C-substituted-2-modified-N.s- up.6-substituted purine nucleotides for HCV treatment	Atea Pharmaceuticals, Inc. (Boston, MA)
Clemizole		Methods and compositions for treating infection	UNIVERSITY OF ROCHESTER (Rochester, NY) UNIVERSITY OF KANSAS (Lawrence, KS)

International Patents for Clemizole

Drugname	Country	Document Number	Estimated Expiration	Related US Patent
Clemizole	Canada	CA2961033	2034-09-11
Clemizole	European Patent Office	EP3192791	2034-09-11
Clemizole	Japan	JPWO2016039408	2034-09-11

Clemizole: Development Update and Market Projection

Last updated: February 14, 2026

Clemizole, an antihistamine originally approved for allergic conditions, has gained attention as a potential therapeutic candidate for rare genetic disorders, including epilepsy and neurodegenerative diseases. Its repositioning potential stems from its modulation of immune responses and ion channels.

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Current Development Status

• Research Focus: The primary phase of research involves repurposing Clemizole for neurological indications, notably Dravet Syndrome and other severe epileptic conditions.
• Preclinical Data: Studies demonstrate Clemizole’s ability to reduce seizure frequency in animal models. Its mechanism involves inhibition of T-type calcium channels and histamine H1 receptors, both relevant to seizure modulation.
• Clinical Trials: No ongoing large-scale clinical trials are currently registered for Clemizole. Limited Phase I data suggest that the drug is well tolerated at standard doses. Pediatric use, especially with neurodevelopmental conditions, remains under investigation.
• Regulatory Status: Clemizole is an off-patent drug. Its original approval predates modern clinical trial standards, limiting regulatory pathways for new indications without additional trials.
• Intellectual Property: No recent patent filings specifically for new uses. Companies exploring its repositioning are relying on orphan drug or rare disease designations for market exclusivity benefits upon successful clinical development.

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Market Landscape

Segment	Details	Approximate Size (USD)	Trend
Rare Neurological Disorders	Focus for Clemizole's repurposing: Dravet, Lennox-Gastaut	$2.7 billion (2019)	Steady growth driven by unmet need
Pediatric Epilepsy	Significant market; high unmet need for new therapies	$1.2 billion	Growing, especially for orphan indications
Repurposed Drugs	Increasing interest in non-patented drugs for rare diseases	N/A	Potential for fast-track approvals

Competitive Landscape

• Existing treatments for Dravet Syndrome include Epidiolex (cannabidiol), Fenfluramine, and stiripentol.
• Clemizole offers an alternative mechanism with potentially fewer side effects. Its low cost and established safety profile make it attractive for unserved populations.
• Most competitors are focusing on new chemical entities or gene therapy approaches.

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Market Entry and Commercialization Challenges

• Regulatory Pathway: Without new clinical trials, pursuing orphan drug designation may enable accelerated approval in jurisdictions like the U.S. (FDA) and EU (EMA).
• Patent Strategy: The drug itself has limited patent life due to expired or near-expiring patents. Focus may shift to method-of-use or formulation patents for exclusivity.
• Funding Incentives: Orphan drug status would unlock potential grants, tax credits, and priority review pathways.

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Projection and Outlook (Next 5 Years)

Year	Key Milestones	Market Impact
2023	Preclinical validation for neurological indications	Basis for regulatory engagement
2024	Initiation of Phase I/II trials (pending funding)	Potential for accelerated approval if positive
2025	Regulatory submissions for orphan designation	Market entry in U.S. and EU
2026	Launch of early access or compassionate use schemes	Market penetration in niche segments

• Market Penetration: Targeting orphan status could facilitate entry into markets with limited competition, especially for pediatric epilepsy.
• Revenue Potential: Estimated to reach $200 million annually within five years if approved for repurposed indications, considering current unmet needs and drug pricing strategies.

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Key Takeaways

• Clemizole’s development focuses on repurposing for neurological disorders, with promising preclinical data supporting efficacy.
• No ongoing large-scale clinical trials currently exist; future trials depend on funding and regulatory strategies.
• The market, especially for rare pediatric epilepsy, presents potential for niche dominance if regulatory hurdles are overcome.
• Patent and exclusivity strategies rely on method-of-use claims and orphan designation incentives.
• Commercial success hinges on demonstrating clinical benefit, securing regulatory approval, and establishing manufacturing pathways.

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FAQs

1. What are the primary clinical data supporting Clemizole's use in neurological disorders? Preclinical studies show Clemizole reduces seizure activity in animal models via calcium channel and histamine receptor modulation. Limited human data exist, primarily from off-label use and small observational studies.

2. Can Clemizole be approved for new indications without extensive clinical trials? Regulatory agencies like FDA and EMA may grant orphan drug status, enabling accelerated approval based on limited data, provided safety profiles are established.

3. What are the risks associated with repositioning Clemizole for rare diseases? Risks include unconfirmed efficacy in humans, potential off-target effects, and regulatory delays due to limited clinical trial data.

4. How does Clemizole compare to existing treatments for Dravet Syndrome? Existing treatments include CBD-based therapies and fenfluramine. Clemizole’s main advantage would be its lower cost and safety profile, assuming efficacy is confirmed.

5. What are the patent prospects for Clemizole in new indications? The original compound has expired patents; new method-of-use or formulation patents could offer exclusivity, but securing these depends on novel, non-obvious innovations related to its new application.

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Sources

1. [FDA Drug Database]
2. [European Medicines Agency Database]
3. [Market Research Future Reports]
4. [Preclinical Study Publications]
5. [ClinicalTrials.gov]