Last Updated: June 23, 2026

CLINICAL TRIALS PROFILE FOR TIMOLOL


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505(b)(2) Clinical Trials for TIMOLOL

This table shows clinical trials for potential 505(b)(2) applications. See the next table for all clinical trials
Trial Type Trial ID Title Status Sponsor Phase Start Date Summary
New Formulation NCT01426113 ↗ A Study of the Safety and Efficacy of Bimatoprost Ophthalmic Solution in Paediatric Patients With Glaucoma Terminated Allergan Phase 3 2011-09-01 The purpose of this study is to assess the safety and efficacy of a new formulation of bimatoprost ophthalmic solution compared to timolol ophthalmic solution in the treatment of paediatric patients with glaucoma.
New Formulation NCT02973880 ↗ Clinical Study to Evaluate the Efficacy and Tolerability of an Anti-inflammatory/Antibiotic Treatment Following Ocular Cataract Extraction Completed Sintesi Research Srl Phase 3 2017-10-15 Cataract is an ophthalmic disease that usually affects the elderly population. Cataract surgery with phaco-emulsification is now the most frequently performed intraocular surgical procedure in the developed world. However, differences in surgical technique impact the severity of surgical trauma and post-operative recovery. The amount of post-operative ocular pain and inflammation plays a significant role in the Patient's perception of the surgical success. Several ophthalmic products have been studied in the management of post-surgery ocular inflammation and pain following cataract surgery. Corticosteroids are considered the gold standard for the treatment of ocular inflammation, and their most commonly used route of administration is the topical instillation as eye drops formulation. After topical administration of Dexamethasone, the concentration in the anterior chamber increases and declines within hours, necessitating frequent daily instillations of eye drops for several weeks. This might be associated with compliance issues, particularly in elderly Patients or in individuals with disabilities. A pharmaceutical formulation allowing for a less frequent administration could therefore be an attractive alternative. NETILDEX™ eye drops solution, containing Netilmicin Sulfate 4.55 mg (3mg/ml) and Dexamethasone Disodium Phosphate 1.32 mg (1mg/ml), is already available for Patients. A new ophthalmic gel, preservative-free formulation has been developed. This new formulation has been tested in pre-clinical animal studies and in a clinical trial. The new formulation contains Xanthan gum, a high molecular mass polysaccharide approved by the FDA in 1969 for food products. It is used in the product as viscosity enhancer and to give to the product pseudo-plastic characteristics and prolonged ocular retention time. The purpose of this trial is to show that the administration of a reduced dose of NETILDEX ™ gel 2 times a day starting on the day of cataract extraction by means of phaco-emulsification and administered until 14 days after surgery is sufficient to obtain a non-inferior efficacy of the NETILDEX ™ eye drops solution administered 4 times a day for the same period.
New Formulation NCT02973880 ↗ Clinical Study to Evaluate the Efficacy and Tolerability of an Anti-inflammatory/Antibiotic Treatment Following Ocular Cataract Extraction Completed SIFI SpA Phase 3 2017-10-15 Cataract is an ophthalmic disease that usually affects the elderly population. Cataract surgery with phaco-emulsification is now the most frequently performed intraocular surgical procedure in the developed world. However, differences in surgical technique impact the severity of surgical trauma and post-operative recovery. The amount of post-operative ocular pain and inflammation plays a significant role in the Patient's perception of the surgical success. Several ophthalmic products have been studied in the management of post-surgery ocular inflammation and pain following cataract surgery. Corticosteroids are considered the gold standard for the treatment of ocular inflammation, and their most commonly used route of administration is the topical instillation as eye drops formulation. After topical administration of Dexamethasone, the concentration in the anterior chamber increases and declines within hours, necessitating frequent daily instillations of eye drops for several weeks. This might be associated with compliance issues, particularly in elderly Patients or in individuals with disabilities. A pharmaceutical formulation allowing for a less frequent administration could therefore be an attractive alternative. NETILDEX™ eye drops solution, containing Netilmicin Sulfate 4.55 mg (3mg/ml) and Dexamethasone Disodium Phosphate 1.32 mg (1mg/ml), is already available for Patients. A new ophthalmic gel, preservative-free formulation has been developed. This new formulation has been tested in pre-clinical animal studies and in a clinical trial. The new formulation contains Xanthan gum, a high molecular mass polysaccharide approved by the FDA in 1969 for food products. It is used in the product as viscosity enhancer and to give to the product pseudo-plastic characteristics and prolonged ocular retention time. The purpose of this trial is to show that the administration of a reduced dose of NETILDEX ™ gel 2 times a day starting on the day of cataract extraction by means of phaco-emulsification and administered until 14 days after surgery is sufficient to obtain a non-inferior efficacy of the NETILDEX ™ eye drops solution administered 4 times a day for the same period.
New Formulation NCT05857267 ↗ Dorzolamide+Timolol Multidose Preservative-free vs Dorzolamida+Timolol BAK Preserved Efficacy and Safety Recruiting Laboratorios Poen Phase 4 2023-03-07 The goal of this study is to evaluate the tolerability of the new formulation of Dorzolamide+Timolol preservative free developed in OSD Aptar Pharma multidose system in comparison with Dorzolamide +Timolol BAK preserved ophthalmic formulation.
>Trial Type >Trial ID >Title >Status >Phase >Start Date >Summary

All Clinical Trials for TIMOLOL

Trial ID Title Status Sponsor Phase Start Date Summary
NCT00004641 ↗ Prevention of Esophageal Varices by Beta-Adrenergic Blockers Completed Yale University Phase 3 1993-08-01 The purpose of this study is to learn whether timolol is useful in preventing or delaying the appearance of gastroesophageal varices, a complication that may develop in the future as a consequence of liver disease. Cirrhosis causes an increased resistance of blood flowing through the liver. This leads to an increased pressure in the portal vein (the vein that takes blood to your liver). High portal pressure is responsible for the appearance of complications of chronic liver disease such as varices and variceal bleeding (bleeding from veins in your esophagus). Timolol belongs to a group of medications called beta-blockers. Beta-blockers decrease high portal pressure and previous studies have shown that beta-blocker pills are useful in preventing bleeding from varices in patients who already have varices. A more desirable effect would be if these pills could prevent not only bleeding from varices but the appearance of varices (and therefore of bleeding).
NCT00004641 ↗ Prevention of Esophageal Varices by Beta-Adrenergic Blockers Completed National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) Phase 3 1993-08-01 The purpose of this study is to learn whether timolol is useful in preventing or delaying the appearance of gastroesophageal varices, a complication that may develop in the future as a consequence of liver disease. Cirrhosis causes an increased resistance of blood flowing through the liver. This leads to an increased pressure in the portal vein (the vein that takes blood to your liver). High portal pressure is responsible for the appearance of complications of chronic liver disease such as varices and variceal bleeding (bleeding from veins in your esophagus). Timolol belongs to a group of medications called beta-blockers. Beta-blockers decrease high portal pressure and previous studies have shown that beta-blocker pills are useful in preventing bleeding from varices in patients who already have varices. A more desirable effect would be if these pills could prevent not only bleeding from varices but the appearance of varices (and therefore of bleeding).
NCT00006398 ↗ Prevention of Esophageal Varices by Beta-Adrenergic Blockers Completed Yale University Phase 3 1993-08-01 The purpose of this study is to learn whether timolol is useful in preventing or delaying the appearance of gastroesophageal varices, a complication that may develop in the future as a consequence of liver disease. Cirrhosis causes an increased resistance of blood flowing through the liver. This leads to an increased pressure in the portal vein (the vein that takes blood to your liver). High portal pressure is responsible for the appearance of complications of chronic liver disease such as varices and variceal bleeding (bleeding from veins in your esophagus). Timolol belongs to a group of medications called beta-blockers. Beta-blockers decrease high portal pressure and previous studies have shown that beta-blocker pills are useful in preventing bleeding from varices in patients who already have varices. A more desirable effect would be if these pills could prevent not only bleeding from varices but the appearance of varices (and therefore of bleeding).
NCT00006398 ↗ Prevention of Esophageal Varices by Beta-Adrenergic Blockers Completed National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) Phase 3 1993-08-01 The purpose of this study is to learn whether timolol is useful in preventing or delaying the appearance of gastroesophageal varices, a complication that may develop in the future as a consequence of liver disease. Cirrhosis causes an increased resistance of blood flowing through the liver. This leads to an increased pressure in the portal vein (the vein that takes blood to your liver). High portal pressure is responsible for the appearance of complications of chronic liver disease such as varices and variceal bleeding (bleeding from veins in your esophagus). Timolol belongs to a group of medications called beta-blockers. Beta-blockers decrease high portal pressure and previous studies have shown that beta-blocker pills are useful in preventing bleeding from varices in patients who already have varices. A more desirable effect would be if these pills could prevent not only bleeding from varices but the appearance of varices (and therefore of bleeding).
NCT00007592 ↗ Hypertension Screening and Treatment Program Completed US Department of Veterans Affairs 1989-06-01 Hypertension is one of the most common medical problems in the United States and in the VA health care system. It has been well-documented that hypertension can be effectively treated. However, there remain important unresolved clinical questions in the area of antihypertensive treatment. For example, how much is mortality affected by visit compliance, blood pressure control and type of antihypertensive agent? Or, are some regimens associated with more morbidity than others? Or, are there inexpensive regimens that are as effective as more expensive regimens? The amount of data that is available from this demonstration project (currently 6,100 patients) will help address these questions. The answers to these questions should result in better care for veterans with hypertension.
NCT00007592 ↗ Hypertension Screening and Treatment Program Completed VA Office of Research and Development 1989-06-01 Hypertension is one of the most common medical problems in the United States and in the VA health care system. It has been well-documented that hypertension can be effectively treated. However, there remain important unresolved clinical questions in the area of antihypertensive treatment. For example, how much is mortality affected by visit compliance, blood pressure control and type of antihypertensive agent? Or, are some regimens associated with more morbidity than others? Or, are there inexpensive regimens that are as effective as more expensive regimens? The amount of data that is available from this demonstration project (currently 6,100 patients) will help address these questions. The answers to these questions should result in better care for veterans with hypertension.
NCT00061542 ↗ Safety and Efficacy Study of BETOPTIC S 0.25% and Timolol Gel-forming Solution 0.25% and 0.5% in Pediatric Patients With Glaucoma or Ocular Hypertension Completed Alcon Research Phase 3 2003-01-01 The purpose of this study is to evaluate the safety and efficacy of BETOPTIC S and Timolol Gel-forming solution in pediatric patients. Patients will dose with study drug at 8 am and 8 pm daily for twelve weeks. Patients will have vision tested, slit lamp exam, blood pressure and pulse checks at each visit. Patients will have a dilated fundus exam and corneal measurements taken at first and last visit.
>Trial ID >Title >Status >Phase >Start Date >Summary

Clinical Trial Conditions for TIMOLOL

Condition Name

Condition Name for TIMOLOL
Intervention Trials
Ocular Hypertension 122
Glaucoma 77
Open-Angle Glaucoma 39
Glaucoma, Open-Angle 21
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Condition MeSH

Condition MeSH for TIMOLOL
Intervention Trials
Glaucoma 179
Ocular Hypertension 140
Hypertension 118
Glaucoma, Open-Angle 116
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Clinical Trial Locations for TIMOLOL

Trials by Country

Trials by Country for TIMOLOL
Location Trials
United States 390
China 31
Italy 24
Germany 22
Canada 21
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Trials by US State

Trials by US State for TIMOLOL
Location Trials
California 33
Texas 29
New York 19
Pennsylvania 19
Georgia 18
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Clinical Trial Progress for TIMOLOL

Clinical Trial Phase

Clinical Trial Phase for TIMOLOL
Clinical Trial Phase Trials
PHASE4 2
PHASE3 3
PHASE2 3
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Clinical Trial Status

Clinical Trial Status for TIMOLOL
Clinical Trial Phase Trials
Completed 173
Recruiting 28
Terminated 16
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Clinical Trial Sponsors for TIMOLOL

Sponsor Name

Sponsor Name for TIMOLOL
Sponsor Trials
Alcon Research 37
Allergan 35
Pfizer 15
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Sponsor Type

Sponsor Type for TIMOLOL
Sponsor Trials
Industry 183
Other 124
NIH 5
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Timolol Clinical Trials Update, Market Analysis and Projection: Trials, Competitors, Patent/Regulatory Exposure, and Commercial Outlook

Last updated: May 21, 2026

Timolol is an established ophthalmic beta-blocker and an older cardiovascular agent. Its clinical-trial pipeline is dominated by (1) incremental ocular formulations (typically fixed-combinations) and (2) device- or delivery-system studies rather than first-in-class systemic innovation. Market growth is driven by ophthalmology demand and switches among branded and generic products, while competitive pressure keeps pricing and margins compressed.


What is the current clinical trial landscape for timolol?

Fast answer: Most active trials for timolol focus on ophthalmic indications (open-angle glaucoma, ocular hypertension) and on comparative or formulation/device endpoints, including fixed combinations and tolerability-focused studies. Systemic timolol trials are largely limited to pharmacodynamic comparisons or pharmacotherapy optimization.

Which timolol trial types are most common?

  1. Ophthalmic formulation and bioavailability
    • New solubilizers, preservative systems, viscosity modifiers, and dosing regimens.
    • Sustained-release or gel/solution alternatives.
  2. Fixed-combination comparisons
    • Studies comparing timolol-containing combinations versus other monotherapies or other combo regimens.
    • Primary endpoints often include intraocular pressure (IOP) reduction and persistence of effect.
  3. Device and delivery studies
    • Preservative-free formats, contact with ocular surface, and tolerability.
    • Treatment adherence proxies such as dosing frequency and patient-reported outcomes.

How should companies interpret trial signals for timolol?

  • Any “new” timolol entrant competes in a space with high generic penetration. Trial outcomes that support dosing convenience, reduced irritation, or improved persistence can matter more than incremental IOP efficacy.
  • Sponsors often target label expansion or differentiation within existing glaucoma/ocular hypertension standards of care rather than novel MoAs.

Which diseases and indications are driving timolol trials today?

Fast answer: The largest remaining clinical activity concentrates in ophthalmology, especially open-angle glaucoma and ocular hypertension. Cardiovascular indications historically included hypertension and angina, but the current trial footprint is smaller and more incremental.

Ophthalmology: where timolol remains relevant

  • Open-angle glaucoma
  • Ocular hypertension
  • Post-operative ocular pressure control in some study designs
  • Combination regimens with prostaglandin analogs and other agents

Cardiovascular: where timolol trial activity is thinner

  • Blood pressure and heart-rate control optimization
  • Comparative pharmacology and tolerability studies
  • Device studies for drug delivery are less frequent than in ophthalmic development

What is the FDA regulatory status of timolol and key timolol-containing products?

Fast answer: Timolol is widely approved in the US for ophthalmic use; many products are generic. Fixed combinations containing timolol also have approved labeling in glaucoma/ocular hypertension. Systemic timolol is older and largely mature in the market.

What does “Orange Book status” typically look like for timolol?

  • The portfolio is usually split between:
    • Generic approvals for older references or equivalents
    • Formulation and method-of-use patents for branded originators of particular formulations
  • For many widely marketed timolol products, the most relevant “risk” is not new regulatory exclusivity, but patent tail effects and patent challenges to formulation or combination claims.

Pathway considerations

  • Ophthalmic generics commonly pursue ANDA routes using literature and bioequivalence where applicable.
  • New entrants often rely on formulation differentiation to win acceptance in prescriber preference and pharmacy contracts rather than waiting for clinical differentiation.

What patents protect timolol products, and when do they expire?

Fast answer: Timolol itself is long beyond primary patent coverage. The practical protection in 2026 comes from formulation, combination, and use patents tied to specific timolol-containing products, plus any remaining exclusivity for particular labeled indications or delivery systems.

Where protection usually remains

  1. Formulation patents
    • Preservative-free systems
    • Gel formulations
    • Stability and ocular surface retention methods
  2. Fixed-combination patents
    • Timolol plus additional active ingredients with defined dosing and composition
  3. Method-of-use patents
    • Dosing regimens and therapeutic monitoring steps

How to think about expiration for market entry

  • If protection is active, ANDA entrants typically use Paragraph IV challenges when claim strength is manageable and settlement timelines are favorable.
  • If protection is weak or expiring, the “commercial” window shifts quickly to generics and authorized generics.

How many companies compete in timolol ophthalmic and what is the intensity of generics?

Fast answer: Competition is high, with numerous authorized generic and standalone generic entrants in ophthalmic timolol and fixed timolol combinations. Price competition is structurally intense because the active is mature and clinical differentiation is limited.

Competitive landscape shape

  • Large generic companies dominate distribution.
  • Specialty ophthalmology brands remain for combination products that have additional IP or brand differentiation.
  • Contracting and PBM formularies drive share more than clinical switching within the same drug class.

Key competitive pressure channels

  • Pharmacy channel substitution of generics
  • Prescriber familiarity with multi-agent glaucoma pathways
  • Formulary tiering based on WAC net-to-net discounting

What is the global market outlook for timolol: ophthalmic vs systemic?

Fast answer: Market growth comes primarily from ophthalmic demand, driven by aging populations and glaucoma prevalence, while systemic timolol remains stable to modestly contracting due to therapeutic shifts and generic saturation.

Demand drivers

  • Glaucoma prevalence and progressive screening
  • Long-term adherence requirements for chronic IOP control
  • Switch dynamics between timolol-based therapy lines and other IOP-lowering classes

Value growth vs volume growth

  • Value growth lags volume growth because generic pricing compresses revenue.
  • Differentiated products (for example, preservative-free, fixed-combo) can support higher realized pricing but face rapid generic encroachment.

What are the revenue risks for timolol by commercial segment?

Fast answer: Revenue is most exposed in:

  • Standalone ophthalmic timolol where generic substitution is immediate
  • Fixed-combination timolol products where combination-specific patents may delay entry but ultimately face generic ANDA pressure

Risk map by segment

Segment Primary revenue lever Main risk Typical mitigation
Standalone ophthalmic timolol Net pricing and contract retention Rapid generic substitution Bundle with combos, adherence-focused marketing
Fixed-combination timolol Formulary position and patient tolerance Patent challenges and entry timing Differentiated formulations; settlements
Systemic timolol Stable prescribing base Policy and therapeutic preference shifts Cost-effective supply, authorized generics

When does timolol lose exclusivity and how does that affect generic launch timing?

Fast answer: For most widely marketed timolol products, exclusivity tied to originator references has already passed. The relevant “loss of exclusivity” events now are largely formulation- or combination-specific.

Generic launch mechanics that matter

  • Orange Book claim expiration drives legal posture.
  • Paragraph IV challenges trigger potential 30-month stay or settlement-driven acceleration.
  • Authorized generics frequently capture share quickly after patent/settlement milestones.

Timing outcomes commonly seen

  • If a settlement includes earlier “no-AD/skinny label” terms, market entry can occur before hard expirations.
  • If litigation holds, entry can shift to post-expiration launch.

What patent litigation affects timolol (Paragraph IV, settlements, and entry barriers)?

Fast answer: Litigation risk concentrates around (1) formulation patents, (2) combination claims, and (3) specific dosing or use claims in ophthalmic fixed combinations. Standalone timolol typically has limited remaining enforceable IP.

Typical legal pattern in timolol-fixed combo disputes

  • Brand or formulation holder asserts composition and use claims.
  • Generic challenger argues lack of novelty/obviousness or invalidity based on prior art.
  • Settlements often trade off:
    • entry timing
    • label carve-outs
    • non-infringement positions

What formulations are protected for timolol and what delivery systems matter commercially?

Fast answer: The most commercially relevant differentiation is tied to ocular tolerability and dosing convenience: preservative-free products, gel/viscous formulations, and fixed combinations.

Formulation levers

  • Preservative system changes (reduced irritation)
  • Increased ocular surface contact time
  • Stability and drop-size uniformity for dosing adherence

Why delivery matters for market share

  • Preservative-free and tolerability advantages can drive formulary selection even when IOP efficacy is comparable.
  • Once generics match active ingredient and core performance, contract leverage and patient experience become decisive.

How does timolol compare with other glaucoma first-line and combination classes?

Fast answer: Timolol is positioned as an effective IOP-lowering beta-blocker but faces sustained competitive pressure from prostaglandin analogs, fixed-combination regimens, and newer adjunctive classes that often offer stronger efficacy or improved tolerability.

Competitive comparison points

  • Prostaglandin analogs often have superior IOP-lowering magnitude with once-daily dosing, shaping first-line preference.
  • Timolol combinations remain relevant due to additive IOP reduction and established cost profiles.
  • Patient tolerability and preservative burden frequently decide between classes within a step-therapy framework.

Which generic entry risks exist for timolol and timolol fixed combinations?

Fast answer: Generic entry risk is highest for products with expiring formulation or combination patents and those with weak claim scope. The “barrier” is less about timolol itself and more about how narrow or broad the remaining protected claims are.

Risk factors that increase the probability of early entry

  • Narrowly drafted patents easily designed around
  • Prior art that anticipates formulation features
  • Settlement patterns in related ophthalmic combination litigations
  • Weak enforcement history for specific claim families

What is the biosimilar or biologics risk for timolol?

Fast answer: Timolol is a small molecule; biologics and biosimilar frameworks are not applicable.


Clinical trial and market projection summary: 2026-2030

Fast answer: Timolol’s market is likely to remain stable-to-growing in volume in ophthalmology, with value growth constrained by generic competition. Near-term incremental innovation will continue to target formulation and combination differentiation, not mechanism-of-action novelty.

Projected drivers (directional)

  • Aging population sustains glaucoma and ocular hypertension prevalence
  • Fixed-combination adherence products maintain share even under generic pressure
  • Price competition limits premiumization unless delivery and tolerability support contracting advantages

Projected headwinds

  • Generic substitution across mainstream timolol products
  • Continued manufacturing scale by generics compresses margins
  • Patent tail effects mainly shift timing rather than eliminate competitive pressure

Key Takeaways

  • Timolol clinical activity is dominated by ophthalmic formulation and combination studies, with endpoints centered on IOP control, tolerability, and dosing convenience.
  • Market growth is expected primarily from ophthalmology volume, while revenues face ongoing compression from high generic penetration.
  • The relevant exclusivity and litigation focus is on combination and formulation patents tied to specific labeled products, not on timolol’s original mechanism.
  • Commercial outcomes in timolol will track IP expiry, settlement timing, and formulary contracting more than novel clinical efficacy.

FAQs

  1. Are there any new timolol ocular delivery systems in late-stage trials?
  2. What is the typical dosing frequency and label positioning for timolol fixed combinations versus timolol monotherapy?
  3. How do preservative-free timolol products affect formulary access and pharmacy switching?
  4. What Paragraph IV claim types most commonly drive settlements for timolol-containing ophthalmic products?
  5. How does timolol performance in real-world IOP control compare with prostaglandin analog first-line strategies?

References (APA)

  1. FDA. (n.d.). Drug Approval Reports and labeling for timolol-containing products. U.S. Food and Drug Administration.
  2. FDA. (n.d.). Orange Book: Approved Drug Products with Therapeutic Equivalence Evaluations (Search results for timolol and timolol combinations). U.S. Food and Drug Administration.
  3. ClinicalTrials.gov. (n.d.). Timolol studies. U.S. National Library of Medicine.

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