ANTIZOL Drug Patent Profile

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

Antizol is a drug marketed by Par Pharm Inc and is included in one NDA. There is one patent protecting this drug and two Paragraph IV challenges.

This drug has nine patent family members in eight countries.

The generic ingredient in ANTIZOL is fomepizole. There are five drug master file entries for this compound. Six suppliers are listed for this compound. Additional details are available on the fomepizole profile page.

DrugPatentWatch^® Litigation and Generic Entry Outlook for Antizol

A generic version of ANTIZOL was approved as fomepizole by AM REGENT on December 14^th, 2007.

Summary for ANTIZOL

International Patents:	9
US Patents:	1
Applicants:	1
NDAs:	1
Raw Ingredient (Bulk) Api Vendors:	103
Clinical Trials:	2
Patent Applications:	3,422
What excipients (inactive ingredients) are in ANTIZOL?	ANTIZOL excipients list
DailyMed Link:	ANTIZOL at DailyMed

Recent Clinical Trials for ANTIZOL

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

Sponsor	Phase
Horizon Pharma USA, Inc.	Phase 2
Ted Daley, President	Phase 2
Raptor Pharmaceuticals Inc.	Phase 2

See all ANTIZOL clinical trials

Paragraph IV (Patent) Challenges for ANTIZOL

Tradename	Dosage	Ingredient	Strength	NDA	ANDAs Submitted	Submissiondate
ANTIZOL	Injection	fomepizole	1.5 g/1.5 mL	020696	1	2021-11-01
ANTIZOL	Injection	fomepizole	1.5 g/1.5 mL	020696	1	2014-04-14

US Patents and Regulatory Information for ANTIZOL

ANTIZOL is protected by one US patents.

Applicant	Tradename	Generic Name	Dosage	NDA	Approval Date	TE	Type	RLD	RS	Patent No.	Patent Expiration	Product	Substance	Delist Req.	Exclusivity Expiration
Par Pharm Inc	ANTIZOL	fomepizole	INJECTABLE;INJECTION	020696-001	Dec 4, 1997		DISCN	Yes	No	7,553,863		Y	Y

International Patents for ANTIZOL

See the table below for patents covering ANTIZOL around the world.

Country	Patent Number	Title	Estimated Expiration
South Korea	20080000660	PROCESS FOR THE PREPARATION OF ULTRAPURE 4-METHYLPYRAZOLE
Australia	2006240490	Process for the preparation of ultrapure 4-methylprazole
Mexico	2007013118	PROCESO PARA LA PREPARACION DE 4-METILPIRAZOL ULTRAPURO. (PROCESS FOR THE PREPARATION OF ULTRAPURE 4-METHYLPRAZOLE.)
World Intellectual Property Organization (WIPO)	2006115626
China	101163679	Method of preparing ultrapure 4-methylpyrazole
Japan	2008538560
European Patent Office	1948613	PROCEDE POUR LA PREPARATION DE LA 4-METHYLPYRAZOLE ULTRAPURE (PROCESS FOT THE PREPARATION OF ULTRAPURE 4-METHYLPYRAZOLE)

Market Dynamics and Financial Trajectory for ANTIZOL (Fomepizole)

Last updated: January 6, 2026

Executive Summary

ANTIZOL (fomepizole) is a critical antidote for poisoning caused by methanol and ethylene glycol, widely used in industrial applications and household products. Since regulatory approvals, the drug's market landscape has evolved with rising poisoning incidents and expanding indications. This report provides a comprehensive analysis of ANTIZOL's market dynamics and financial trajectory, including current market drivers, competitive landscape, regulatory impacts, and future growth prospects.

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What Is ANTIZOL and How Does It Function?

Attribute	Details
Active Ingredient	Fomepizole
Drug Class	Antidote, Alcohol Dehydrogenase Inhibitor
Approved Uses	Treatment of methanol and ethylene glycol poisoning
Manufacturer	Horizon Therapeutics (acquired by Takeda Pharmaceutical, 2023)
Approval Year	1999 (FDA), 2000 (EMA)

ANTIZOL inhibits alcohol dehydrogenase, preventing the toxic metabolites formation from methanol and ethylene glycol, thereby reducing tissue damage and mortality risk.

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Market Drivers: What Is Fueling ANTIZOL’s Growth?

1. Rising Incidence of Poisoning

• Global Poisoning Rates: Estimated 1.3 million cases annually worldwide, with methanol and ethylene glycol accounting for a significant proportion (~15%) (WHO, 2020).
• Underreporting & Accessibility: Increased use of illicit alcohol and unregulated industrial substances heighten poisoning risks, especially in emerging markets.

2. Industrial & Household Use of Toxic Alcohols

• Industrial Applications: Adhesives, antifreeze, and solvents.
• Recent Trends: Increased illegal distillation and alcohol adulteration during economic downturns augment poisoning risk.

3. Regulatory Policies & Emergency Protocols

• FDA & EMA Guidelines: Recommends ANTIZOL as first-line antidote.
• Global Initiatives: WHO's strategies emphasize accessible antidotes in low-resource settings, increasing demand.

4. Competitive Landscape & Product Awareness

• Limited Alternatives: Hemodialysis and ethanol are secondary, less-effective treatments.
• Awareness Campaigns: Enhanced medical training increases usage in emergency care.

5. Aging Population & Comorbidities

• Elderly patients with cognitive impairment are more susceptible to accidental poisoning, increasing demand for prompt antidotal therapy.

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Market Overview: Size, Segments, & Geographic Distribution

Segment	Details	Market Share (2022)
By Application	Methanol poisoning	65%
	Ethylene glycol poisoning	35%
By End-User	Hospitals	70%
	Emergency clinics	20%
	Industrial sectors (preventive use)	10%
Regional Market Distribution	North America	45%
	Europe	25%
	Asia-Pacific	20%
	Rest of World	10%

Note: Market share data approximated from IQVIA and industry reports (2022).

Regional Trends

• North America: Mature market with high awareness, steady growth driven by strict regulations.
• Europe: Similar to North America, with expanding hospital infrastructure.
• Asia-Pacific: Rapidly growing due to increased poisoning cases and industrial activity.
• Emerging Markets: Notable potential for growth, hindered by cost and regulatory access.

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Financial Trajectory: Revenue Analysis and Forecasts

Year	Estimated Global Revenue (USD millions)	CAGR (2022-2027)	Sources/Assumptions
2022	150	—	Based on industry estimates and Horizon’s reported sales
2023	165	10%	Post-acquisition synergies & increased awareness
2024	180	9%	Expansion into Asia-Pacific
2025	200	11%	Emerging markets penetration
2026	220	8.5%	Regulatory approvals in developing nations
2027	240	9%	Continued demand surge

Note: The forecast accounts for impacted sales driven by regulatory changes, urbanization, and poisoning incident trends.

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Competitive Landscape

Competitors	Products & Indications	Market Share	Strengths	Weaknesses
Horizon Therapeutics (Takeda)	ANTIZOL (fomepizole)	>80%	Established brand, global distribution	High cost in some regions
Potential Alternatives	Ethanol therapy, Hemodialysis	Small niche	Cost-effectiveness	Less effective, less controlled dosing
Emerging Players	Generic formulations	Growing presence	Cost competitiveness	Limited global reach

Note: Horizon maintained dominant market leadership, with patent rights till 2027, after which generics are expected to entrench.

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Regulatory and Policy Impact

Key Regulations Influencing Market Trajectory

Region	Regulation	Impact on ANTIZOL Market
US	FDA guidelines endorse ANTIZOL as first-line	Sustains high demand
EU	EMA approvals with reimbursement schemes	Facilitates access
China & India	Growing incorporation into national Essential Medicines Lists	Catalyzes regional uptake
Low-resource Settings	WHO initiatives encourage availability	Potential for increased generic adoption

Intellectual Property & Patent Status

• Patent expiry anticipated by 2027, opening opportunities for generics.
• Patent landscapes influence pricing and market penetration strategies.

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Market Challenges & Risks

Challenge	Impact	Mitigation Strategies
High Cost of Therapy	Limits access in low-income regions	Price negotiations, generics development
Regulatory Delays	Hinder approvals and availability	Proactive engagement with authorities
Poisoning Trends Variability	Affects demand cyclicality	Diversify indications, expand preventive sales
Competition from Alternatives	Erodes market share	Brand differentiation, education campaigns
Supply Chain Disruptions	Impact on delivery and inventory	Diversify suppliers

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Future Growth Opportunities

1. Expansion into Developing Nations

• Addressing unmet needs in Africa, Latin America, and Asia-Pacific.
• Partnering with local governments and NGOs.

2. Indication Expansion

• Investigating ANTIZOL’s potential in animal poisoning, occupational safety, and accidental exposures.

3. Combination Therapy Research

• Developing adjunct therapies to improve efficacy and reduce costs.

4. Formulation Innovations

• Developing easier-to-administer formulations (e.g., intramuscular, oral).

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Comparison with Competing Treatments

Treatment	Efficacy	Cost	Ease of Use	Limitations
ANTIZOL	High	Premium	IV administration	Costly, cold chain requirements
Ethanol Therapy	Moderate	Lower	Oral, outpatient	Less predictable pharmacokinetics
Hemodialysis	High	Very high	Limited to hospital setting	Infrastructure intensive
Placebo/Supportive Care	Ineffective alone	Variable	Easy	Does not counteract toxin

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Key Takeaways

• Rising Poisoning Incidences: Increasing global poisoning events, especially in emerging markets, underpin sustained demand for ANTIZOL.
• Market Maturity & Patent Expiry: With patents expiring around 2027, proliferation of generics will likely accelerate price competition.
• Regulatory & Policy Factors: Strong regulatory support in major markets sustains growth, but regional disparities remain.
• Growth Prospects: Expansion into low-resource areas, and indications beyond poisoning treatment, present significant opportunities.
• Competitive Dynamics: Horizon’s dominant position faces impending generic entries, emphasizing the need for strategic differentiation and cost management.

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FAQs

Q1: What factors most significantly influence ANTIZOL’s market growth?
A: Rising poisoning incidents, regulatory endorsements, expanding use in emerging markets, and patent expiration are primary drivers.

Q2: How does the patent expiry impact ANTIZOL’s financial outlook?
A: Patent expiry around 2027 will facilitate generic entry, pressuring prices but also expanding market share due to lower costs.

Q3: Are there alternative therapies to ANTIZOL?
A: Yes, ethanol therapy and hemodialysis serve as alternatives but are less effective, more cumbersome, and less controlled.

Q4: What geographic markets offer the highest growth potential?
A: Asia-Pacific, Latin America, and Africa hold significant untapped potential, driven by rising industrial activity and poisoning cases.

Q5: How are regulatory policies shaping ANTIZOL’s accessibility?
A: Favorable policies and inclusion in essential medicines lists enhance availability, especially in low-resource settings.

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References

1. World Health Organization (WHO). (2020). Toxic Alcohol Poisoning Data Report.
2. IQVIA. (2022). Global Antidote Market Report.
3. Horizon Therapeutics. (2022). Annual Report.
4. European Medicines Agency (EMA). (2000). ANTIZOL (fomepizole) approval documents.
5. U.S. Food & Drug Administration (FDA). (1999). Drug approval announcement for ANTIZOL.