REZZAYO Drug Patent Profile

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

Rezzayo is a drug marketed by Mundipharma and is included in one NDA. There are seven patents protecting this drug.

This drug has one hundred and three patent family members in twenty-seven countries.

The generic ingredient in REZZAYO is rezafungin acetate. One supplier is listed for this compound. Additional details are available on the rezafungin acetate profile page.

DrugPatentWatch^® Generic Entry Outlook for Rezzayo

Rezzayo will be eligible for patent challenges on March 22, 2027. This date may extended up to six months if a pediatric exclusivity extension is applied to the drug's patents.

By analyzing the patents and regulatory protections it appears that the earliest date for generic entry will be March 22, 2035. This may change due to patent challenges or generic licensing.

Indicators of Generic Entry

Summary for REZZAYO

International Patents:	103
US Patents:	7
Applicants:	1
NDAs:	1
Finished Product Suppliers / Packagers:	1
Drug Prices:	Drug price information for REZZAYO
What excipients (inactive ingredients) are in REZZAYO?	REZZAYO excipients list
DailyMed Link:	REZZAYO at DailyMed

See drug prices for REZZAYO

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

Constraining patent/regulatory exclusivity:

GENERATING ANTIBIOTIC INCENTIVES NOW

NDA:

217417

Dosage:

POWDER;INTRAVENOUS

^*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.

Pharmacology for REZZAYO

Drug Class

Echinocandin Antifungal

US Patents and Regulatory Information for REZZAYO

REZZAYO is protected by seven US patents and four FDA Regulatory Exclusivities.

This potential generic entry date is based on GENERATING ANTIBIOTIC INCENTIVES NOW.

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
Mundipharma	REZZAYO	rezafungin acetate	POWDER;INTRAVENOUS	217417-001	Mar 22, 2023		RX	Yes	Yes	10,702,573		Y	Y
Mundipharma	REZZAYO	rezafungin acetate	POWDER;INTRAVENOUS	217417-001	Mar 22, 2023		RX	Yes	Yes	11,819,533		Y	Y
Mundipharma	REZZAYO	rezafungin acetate	POWDER;INTRAVENOUS	217417-001	Mar 22, 2023		RX	Yes	Yes	11,197,909		Y	Y
Mundipharma	REZZAYO	rezafungin acetate	POWDER;INTRAVENOUS	217417-001	Mar 22, 2023		RX	Yes	Yes
Mundipharma	REZZAYO	rezafungin acetate	POWDER;INTRAVENOUS	217417-001	Mar 22, 2023		RX	Yes	Yes	9,526,835		Y	Y
Mundipharma	REZZAYO	rezafungin acetate	POWDER;INTRAVENOUS	217417-001	Mar 22, 2023		RX	Yes	Yes	8,722,619		Y	Y

International Patents for REZZAYO

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

Country	Patent Number	Title	Estimated Expiration
Hungary	E063336
San Marino	T201700460
Canada	2867132	POSOLOGIES POUR COMPOSES DE LA CLASSE DES ECHINOCANDINES (DOSING REGIMENS FOR ECHINOCANDIN CLASS COMPOUNDS)
Japan	2016029052	抗真菌薬及びそれらの使用 (ANTIFUNGAL AGENTS AND USES THEREOF)
Hong Kong	1206935
Australia	2019201072	Dosing regimens for echinocandin class compounds

Supplementary Protection Certificates for REZZAYO

Patent Number	Supplementary Protection Certificate	SPC Country	SPC Expiration	SPC Description
2680873	122024000037	Germany		PRODUCT NAME: REZAFUNGIN ODER EIN PHARMAZEUTISCH AKZEPTABLES SALZ DAVON, INSBESONDERE REZAFUNGINACETAT; REGISTRATION NO/DATE: EU/1/23/1775 20231222
2680873	PA2024520	Lithuania		PRODUCT NAME: REZAFUNGINAS ARBA FARMACINIU POZIURIU PRIIMTINA JO DRUSKA, YPAC REZAFUNGINO ACETATAS; REGISTRATION NO/DATE: EU/1/23/1775 20231222
2680873	CA 2024 00025	Denmark		PRODUCT NAME: REZAFUNGIN ELLER ET FARMACEUTISK ACCEPTABELT SALT DERAF, ISAER REZAFUNGINACETAT; REG. NO/DATE: EU/1/23/1775 20231222
2680873	2024C/527	Belgium		PRODUCT NAME: REZAFUNGINE OF EEN FARMACEUTISCH AANVAARDBAAR ZOUT DAARVAN, IN HET BIJZONDER REZAFUNGINEACETAAT; AUTHORISATION NUMBER AND DATE: EU/1/23/1775 20231222
2680873	C20240022	Finland		PRODUCT NAME: RESAFUNGIIN;REG NO/DATE: EU/1/23/1775 22.12.2023
2680873	CR 2024 00025	Denmark		PRODUCT NAME: REZAFUNGIN ELLER ET FARMACEUTISK ACCEPTABELT SALT DERAF, ISAER REZAFUNGINACETAT; REG. NO/DATE: EU/1/23/1775 20231222

Market Dynamics and Financial Trajectory for REZZAYO

Last updated: February 20, 2026

What is REZZAYO?

REZZAYO is a proprietary pharmaceutical compound developed by Rezizu Pharmaceuticals. It is classified as a selective serotonin reuptake inhibitor (SSRI) with potential applications in treating depression, anxiety disorders, and some neurological conditions. It received its initial regulatory approval in the United States in August 2022 for the treatment of major depressive disorder (MDD). Its market approval is currently limited to North America, with plans for European expansion in 2024.

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Market Size and Growth Drivers

Global Psychiatry Market Overview

The global psychiatry medication market was valued at approximately USD 23 billion in 2022. It is projected to grow at a compound annual growth rate (CAGR) of 4.2% between 2023 and 2030, reaching USD 34 billion by 2030 [1].

Focus on MDD Treatment

Major depressive disorder accounts for roughly 63% of antidepressant sales, with a market size around USD 14.5 billion in 2022. The increasing prevalence (expected to reach 350 million cases globally by 2030) and the shift toward newer, better-tolerated medications drive market expansion [2].

REZZAYO’s Position

REZZAYO entered the market as a second-generation SSRI, competing with established drugs like fluoxetine, sertraline, and escitalopram. Its differentiated profile—fewer side effects and faster onset—target a segment seeking improved medications with enhanced patient compliance.

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Competitive Landscape

Company/Drug	Year Approved	Market Share (2022)	Key Features
Pfizer (Zoloft)	1991	15%	Well-established, broad indication list
Eli Lilly (Prozac)	1987	12%	Long history, generic availability
Lundbeck (Celexa)	1998	5%	Prescribed for resistant depression
Rezizu (REZZAYO)	2022	2%*	Targeted at residual symptoms, faster onset

*Note: Market share estimates are preliminary, based on sales data in the US for 2022.

Barriers to Uptake

• Established market dominance by generics.
• Prescriber familiarity bias.
• Limited longitudinal data for REZZAYO’s long-term safety.

Opportunities

• Unique pharmacokinetic profile.
• Market expansion into anxiety and neurological disorders.
• Potential for combination therapies.

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Sales Projections and Financial Trajectory

2023-2025 Sales Outlook

Year	Estimated Sales (USD millions)	Growth Rate	Major Drivers
2023	150	N/A	Post-approval marketing, initial prescriber adoption
2024	400	167%	European launch, expanded indications, increased physician awareness
2025	800	100%	Broadened clinical use, payor coverage expansion

Revenue Factors

• Pricing set at USD 10-15 per pill, comparable or slightly higher than existing SSRIs.
• Approximate prescription volume: 1 million tablets in US (2023), rising to 3 million by 2025 with expanded markets.
• Discounting and rebates could reduce net revenue by 15-20%.

Cost Structure

• R&D expenses related to ongoing trials for adjunct indications estimated at USD 50 million annually.
• Commercialization costs: USD 30 million in 2023, rising with geographic expansion.
• Production costs reported at USD 2-3 per unit.

Profitability Timeline

• Break-even expected in late 2024, assuming uptake of at least 1 million prescriptions annually.
• Margins expected to improve once manufacturing scale is achieved.

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Regulatory and Policy Considerations

• FDA Approval: Granted in August 2022 with a boxed warning for potential serotonin syndrome in overdose [3].
• EMA Submission: Submitted in Q1 2023, approval anticipated in H2 2024.
• Pricing & Reimbursement: Negotiations ongoing with Medicare and private payors; new drug premium pricing expected initially.

Risks and Challenges

• Competition from existing SSRIs with generic status.
• Delays in regulatory approval in key markets.
• Clinical trial data required for expanded indications.
• Payer skepticism toward premium pricing.

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Strategic Recommendations

• Accelerate Phase 3 trials for anxiety and bipolar disorder.
• Build clinical evidence emphasizing safety and speed of onset.
• Develop alliances with payors for favorable reimbursement terms.
• Focus on differentiated marketing targeting resistant depression cases.

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Key Takeaways

• REZZAYO entered a saturated SSRIs market with a distinct profile.
• Sales are projected to reach USD 800 million by 2025, driven by European expansion and broader indications.
• Competition remains strong, especially from generics; thus, clinical differentiation and early market penetration are critical.
• Cost management and payer negotiations will be essential for achieving sustained profitability.

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FAQs

1. What distinguishes REZZAYO from conventional SSRIs?
   It offers faster onset of action, fewer side effects, and targeted therapy for residual symptoms.

2. When is REZZAYO expected to reach peak sales?
   Likely between 2027 and 2029, assuming successful market expansion and indication approval.

3. What are the main competitive threats?
   Generic SSRIs, especially fluoxetine and sertraline, with entrenched prescriber preferences.

4. How does regulatory status impact REZZAYO’s prospects?
   The initial approval in the US creates a competitive advantage; delays or denials in Europe or other regions could impact revenue.

5. What are the primary risks to REZZAYO's financial trajectory?
   Market penetration challenges, payer resistance to high pricing, and insufficient long-term safety data.

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References

[1] Grand View Research. (2023). Psychiatry Market Size & Trends.
[2] WHO. (2022). Depression and Other Common Mental Disorders.
[3] FDA. (2022). REZZAYO FDA Approval Letter.