When do the patents on CARBACHOL expire, and when will CARBACHOL go generic?

Sponsor	Phase
Zhaoke (Guangzhou) Ophthalmology Pharmaceutical Ltd.	PHASE2
Visus Therapeutics	Phase 3
Visus Therapeutics	Phase 2

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Applicant	Tradename	Generic Name	Dosage	NDA	Approval Date	TE	Type	RLD	RS	Patent No.	Patent Expiration	Product	Substance	Delist Req.	Exclusivity Expiration
Pharmafair	CARBACHOL	carbachol	SOLUTION;INTRAOCULAR	070292-001	May 21, 1986		DISCN	No	No	⤷ Start Trial	⤷ Start Trial				⤷ Start Trial
>Applicant	>Tradename	>Generic Name	>Dosage	>NDA	>Approval Date	>TE	>Type	>RLD	>RS	>Patent No.	>Patent Expiration	>Product	>Substance	>Delist Req.	>Exclusivity Expiration

Last updated: September 5, 2026

Carbachol is a mature, low-revenue ophthalmic drug with limited patent protection and no meaningful regulatory exclusivity in the United States. Its commercial use is concentrated in intraocular miosis during cataract and other ophthalmic surgery, while topical glaucoma formulations have largely lost commercial importance. Revenue is driven by procedure volumes, hospital purchasing, supply continuity, and generic pricing rather than brand differentiation.

The market has low entry barriers at the active-ingredient level but higher barriers for sterile ophthalmic manufacturing, preservative-free packaging, quality assurance, and hospital procurement. No publicly disclosed blockbuster-scale revenue stream, active branded patent estate, biosimilar program, or material Paragraph IV litigation is associated with carbachol.

What is carbachol used for and how large is its market?

Carbachol is a direct and indirect cholinergic agonist. In ophthalmology, it causes rapid pupillary constriction and can reduce intraocular pressure by improving aqueous humor outflow.

The principal commercial application is intraoperative miosis. Carbachol ophthalmic intraocular solution is injected into the anterior chamber near the end of surgery, particularly after cataract extraction and intraocular lens implantation. The product is supplied as a sterile, single-use solution, commonly at a 0.01% concentration.

Historically, topical carbachol products were used to treat glaucoma and elevated intraocular pressure. That segment has declined because prostaglandin analogs, beta blockers, alpha agonists, and fixed-combination products offer more convenient chronic treatment.

Market attribute	Carbachol position
Primary use	Intraoperative miosis
Main dosage form	Sterile intraocular solution
Common concentration	0.01% intraocular solution
Chronic glaucoma use	Mature and commercially limited
Principal customers	Hospitals, ambulatory surgery centers, ophthalmic surgery distributors
Prescription model	Procedure-linked institutional purchasing
Biosimilar exposure	None
Generic exposure	High
Pricing power	Low
Revenue disclosure	Not separately reported by major manufacturers

Public company filings do not generally report carbachol revenue as a standalone product category. Sales are usually aggregated within ophthalmic pharmaceuticals, surgical products, or generic injectables. Public market reports also vary widely because they combine topical ophthalmic carbachol, intraocular products, global sales, and broader miotic-drug categories.

What FDA products and formulations contain carbachol?

The U.S. market has included both intraocular and topical ophthalmic formulations.

Intraocular carbachol

The best-known branded product is Miostat, a sterile carbachol intraocular solution historically marketed by Alcon. It is administered during ophthalmic surgery and is not intended for chronic outpatient use.

The product has several commercial characteristics:

Single-use sterile packaging
Operating-room administration
Small dose volume
Product demand linked to cataract and anterior-segment surgery
Limited opportunity for consumer-driven brand switching
High sensitivity to manufacturing interruptions

The drug is pharmacologically simple, but the finished dosage form requires sterile production, validated filling, container-closure integrity, and reliable distribution into surgical facilities.

Topical carbachol

Topical products have been marketed under names including Isopto Carbachol and generic carbachol ophthalmic solution. Concentrations historically included 1.5%, 2.25%, and 3%.

Topical carbachol has lost share to newer glaucoma therapies because it can cause ocular discomfort, brow ache, accommodative effects, blurred vision, and reduced tolerability. Its dosing burden is also less attractive than once-daily prostaglandin analog therapy.

When did carbachol lose market exclusivity?

Carbachol lost meaningful U.S. market exclusivity decades ago. The active ingredient is an old small molecule, and its core composition-of-matter protection is long expired.

Exclusivity category	Current commercial significance
New chemical entity exclusivity	Expired
Composition-of-matter patent	Expired
Brand approval exclusivity	Expired
Pediatric exclusivity	No material current relevance
Orphan-drug exclusivity	Not applicable
Formulation protection	Any historic protection is expired or commercially immaterial
Method-of-use protection	No material active exclusivity identified
Biosimilar exclusivity	Not applicable

The relevant commercial question is not whether carbachol has basic molecule protection. It does not. The question is whether a manufacturer can reliably supply an approved sterile product at a price that supports production and distribution.

What patents protect carbachol products?

No material active U.S. patent estate is associated with the core carbachol molecule or the conventional ophthalmic uses of carbachol.

Historical patent activity may have covered specific formulations, containers, manufacturing processes, or delivery systems. Those rights do not create meaningful current protection for standard carbachol ophthalmic solutions because:

The active ingredient is long established.
Conventional intraocular and topical uses are well known.
Generic manufacturers can design around narrow formulation or packaging claims.
Any relevant early patents would have expired.
Hospital buyers generally prioritize availability and price over brand-specific formulation claims.

Formulation and manufacturing barriers

The principal barrier is technical execution rather than patent ownership. A potential entrant must address:

Sterility assurance
Endotoxin control
Particulate limits
Preservative-free or low-preservative packaging
Stability in small-volume containers
Accurate concentration control
Compatibility with intraocular administration
Container-closure integrity
Terminal sterilization or aseptic processing
Consistent supply to surgical distributors

These requirements can discourage entry even when patent risk is negligible. They do not support durable monopoly pricing.

What is the Orange Book status of carbachol?

Carbachol products approved through the NDA or ANDA system may appear in FDA product records and, depending on product status, in the Orange Book. The Orange Book is relevant to listed drug approvals, patent certifications, and therapeutic-equivalence information, but it does not indicate that carbachol has current market exclusivity.

For a standard generic carbachol ophthalmic solution, the commercial position is typically:

Orange Book issue	Carbachol assessment
Active ingredient exclusivity	None
Current core patent barrier	None of commercial significance
Paragraph IV exposure	Low, because the major molecule and use claims are expired
Therapeutic equivalence	Potentially relevant for approved generic products
ANDA pathway	Available for qualifying products
NDA-based brand moat	Weak
Patent listing risk	Product-specific and limited

Orange Book status must be reviewed by product and sponsor because listed patents, discontinued-product designations, and marketing status can change. The broader strategic conclusion remains stable: carbachol is a genericized product category, not an active patent-protected franchise. [1]

Are there Paragraph IV challenges or carbachol patent lawsuits?

No material publicly established Paragraph IV litigation campaign is associated with carbachol’s core ophthalmic products.

The lack of litigation is commercially logical. Paragraph IV litigation is most valuable when a branded product has substantial remaining sales and enforceable patent claims. Carbachol generally has neither. The product’s low revenue base reduces the expected return from patent litigation, while the limited patent estate provides few obvious targets.

Potential disputes are more likely to involve:

ANDA approval or therapeutic equivalence
Manufacturing quality
Sterility failures
Supply contracts
Distribution rights
Product liability
Drug shortage allocation

These issues are distinct from patent litigation.

Which companies compete in the carbachol market?

Competition is fragmented across branded legacy products, generic ophthalmic manufacturers, specialty distributors, and hospital suppliers. The relevant competitors are not limited to carbachol manufacturers.

Direct competitors

Direct competition includes generic carbachol ophthalmic solution suppliers and any manufacturer selling an intraocular carbachol product equivalent to Miostat.

Pharmacologic substitutes

Product or class	Primary use	Competitive effect
Acetylcholine chloride intraocular products	Intraoperative miosis	Closest procedural substitute
Pilocarpine	Miotic and glaucoma therapy	Alternative mechanism and chronic-use option
Prostaglandin analogs	Chronic glaucoma	Major substitute for topical carbachol
Beta blockers	Chronic glaucoma	Older alternative with broader generic supply
Alpha agonists	Chronic glaucoma	Substitute in pressure-lowering therapy
Mechanical or surgical techniques	Intraoperative management	Procedure-specific alternative

Acetylcholine chloride is the closest substitute in the operating room because both products are used to produce miosis during ophthalmic surgery. The choice can depend on surgeon preference, institutional formulary policy, availability, product labeling, and supply conditions.

How strong is the carbachol patent estate?

The carbachol patent estate is weak from a commercial protection perspective.

Patent-strength factor	Assessment
Composition-of-matter protection	Expired
New-use protection	Limited or expired
Formulation protection	Narrow and likely expired for legacy products
Delivery-system protection	Not a material barrier for conventional products
Manufacturing patents	Potentially relevant only to specific processes
Design-around difficulty	Low to moderate
Litigation leverage	Low
Generic launch deterrence	Low

Carbachol does not have the layered patent structure seen in newer ophthalmic products, such as extended-release inserts, drug-device combinations, novel preservatives, sustained-release implants, or proprietary delivery platforms.

What is the financial trajectory for carbachol?

Carbachol revenue is best characterized as mature, low-growth, and supply-sensitive. The product does not have the characteristics of a high-growth specialty pharmaceutical.

Revenue drivers

The main demand drivers are:

Cataract surgery volumes
Refractive and anterior-segment procedures
Hospital and ambulatory surgery center utilization
Product availability
Formulary placement
Distributor inventories
Generic price competition

Cataract surgery provides a relatively stable underlying procedure base, but carbachol captures only a small amount of value per case. Unit growth can therefore occur without producing significant revenue growth.

Margin profile

Margins are likely pressured by:

Generic substitution
Institutional purchasing discounts
Small absolute unit value
Sterile manufacturing costs
Quality-control requirements
Low annual treatment volume per facility
Competitor tendering
Shortages that create temporary price spikes but not durable pricing power

A supplier with an efficient sterile ophthalmic platform can earn attractive niche margins during periods of constrained supply. Those margins are vulnerable to new entrants, contract repricing, and restoration of competing products.

Financial outlook

Period	Expected market condition
Near term	Stable procedure-linked demand; volatility from supply disruptions
Medium term	Low-value generic competition and limited unit growth
Long term	Continued niche use in surgery; further decline in topical glaucoma use
Upside case	Supply-constrained pricing or successful specialty distribution
Downside case	Product discontinuation, substitution by acetylcholine, or additional generic entry

No major manufacturer publicly identifies carbachol as a material revenue concentration. The financial exposure is therefore usually immaterial at diversified-company level but potentially important for a small specialty supplier whose portfolio contains few sterile ophthalmic products.

What generic launch risks exist for carbachol?

A new generic entrant faces low patent risk but meaningful execution risk.

Regulatory risks

FDA approval depends on product-specific requirements, including pharmaceutical equivalence, quality, sterility, stability, and manufacturing compliance. Intraocular products may face heightened scrutiny because contamination or particulate defects can cause serious ocular injury.

Commercial risks

A launch may fail to produce attractive returns if:

The addressable market is too small
Incumbent suppliers cut prices
Hospitals retain preferred vendors
The entrant cannot maintain supply
The product requires expensive sterile capacity
The closest substitute remains more available
A shortage ends before launch

Generic launch scenarios

Scenario	Likely outcome
One additional entrant	Moderate price pressure; limited volume expansion
Multiple entrants	Rapid price erosion and lower margins
Incumbent shortage	Temporary opportunity for available supplier
Branded product withdrawal	Generic conversion but possible supply instability
Hospital contract win	Concentrated volume with lower net price
Topical relaunch	Limited demand because of therapeutic substitution

What licensing deals affect carbachol?

No major, publicly disclosed licensing transaction appears to define the current carbachol market. Historical brand, distribution, or manufacturing arrangements may exist, but they have not created a visible platform comparable with licensing deals for patented ophthalmic delivery technologies.

The commercial value of a carbachol transaction would likely depend on:

Access to an FDA-approved sterile product
Manufacturing capacity
Hospital contracts
Geographic distribution rights
Shortage-era supply arrangements
Portfolio bundling with other ophthalmic products

A transaction focused only on the active ingredient would have limited strategic value because carbachol is widely available and lacks meaningful molecule-level exclusivity.

How does carbachol compare with newer ophthalmic drugs?

Carbachol is substantially weaker as a commercial asset than newer ophthalmic drugs with differentiated delivery systems or durable patent protection.

Factor	Carbachol	Newer ophthalmic therapy
Molecule age	Old	Recent or reformulated
Patent position	Weak or expired	Often layered
Primary buyers	Hospitals and surgery centers	Retail, specialty, or institutional
Price per treatment	Low	Moderate to high
Reimbursement leverage	Limited	Potentially stronger
Generic substitution	High	Often delayed
Clinical differentiation	Narrow	May include improved dosing or tolerability
Revenue visibility	Procedure-linked	May include chronic recurring use
Licensing value	Limited	Potentially substantial

Carbachol’s residual value lies in manufacturing reliability, product availability, and portfolio fit. It is not a conventional innovation asset.

Key Takeaways

Carbachol is a mature ophthalmic drug with no meaningful current molecule-level exclusivity.
The principal U.S. use is intraoperative miosis, especially in cataract and anterior-segment surgery.
Topical glaucoma use has declined because newer therapies are better tolerated and easier to dose.
The patent estate is weak; no material active composition, method-of-use, or formulation barrier is evident.
Paragraph IV and patent-litigation risk are low relative to the product’s limited revenue base.
Sterile manufacturing, quality control, and supply reliability are more important than patent ownership.
Revenue is not separately reported by major diversified manufacturers.
Financial performance is likely stable to declining, with temporary upside during supply shortages.
Acetylcholine chloride is the closest procedural substitute, while prostaglandin analogs dominate chronic glaucoma competition.
Carbachol is a niche generic asset, not a high-growth pharmaceutical franchise.

FAQs

Is carbachol still FDA approved?

FDA-approved carbachol ophthalmic products have included intraocular and topical formulations. Product-level marketing status must be distinguished from historical approval because individual brands can be discontinued while the active ingredient remains available through other approved products. [1][2]

Can a company obtain a new patent on carbachol?

A company may seek patents on a genuinely novel formulation, delivery device, manufacturing process, or combination. A new patent on the old carbachol molecule itself would not be available as a practical matter because the compound is prior art.

Is carbachol a biosimilar product?

No. Carbachol is a small-molecule drug. Follow-on products use generic-drug pathways rather than the FDA biosimilar pathway.

Why can carbachol prices rise despite expired patents?

Prices can rise during shortages because sterile ophthalmic products have limited manufacturing capacity, few suppliers, hospital inventory requirements, and strict quality controls. Short-term scarcity can outweigh ordinary generic price competition.

Does carbachol have significant investment value?

Carbachol has limited standalone investment value. Its strategic value may be higher as part of a broader sterile ophthalmic portfolio, a hospital-supply platform, or a specialty distribution business with manufacturing capacity and established surgical contracts.

References

U.S. Food and Drug Administration. (2024). Approved drug products with therapeutic equivalence evaluations: The Orange Book. FDA.
U.S. Food and Drug Administration. (2024). Drugs@FDA: FDA-approved drugs. FDA.
DailyMed. (2024). Carbachol ophthalmic and intraocular product labeling. National Library of Medicine.
American Academy of Ophthalmology. (2023). Basic and clinical science course: Glaucoma and cataract surgery pharmacology. American Academy of Ophthalmology.
U.S. Food and Drug Administration. (2024). FDA drug shortages and discontinued drug products. FDA.

US Patents:	0
Applicants:	1
NDAs:	1
Raw Ingredient (Bulk) Api Vendors:	62
Clinical Trials:	8
Patent Applications:	4,156
DailyMed Link:	CARBACHOL at DailyMed

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