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Last Updated: April 2, 2026

CLINICAL TRIALS PROFILE FOR ZYRTEC ALLERGY


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505(b)(2) Clinical Trials for ZYRTEC ALLERGY

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
OTC NCT02024152 ↗ Safety, Tolerability and Pharmacokinetics Trial of JDP-205 Injection 10 mg Completed Algorithme Pharma Inc Phase 1 2011-03-01 This study is to investigate the pharmacokinetics (PK) together with the safety and tolerability of JDP-205 at 5 mg and 10 mg intravenous doses and 10 mg intramuscular dose, in comparison to the marketed cetirizine oral product Zyrtec® 10 mg tablets (an OTC product) in healthy male and female volunteers after a single dose administration.
OTC NCT02024152 ↗ Safety, Tolerability and Pharmacokinetics Trial of JDP-205 Injection 10 mg Completed JDP Therapeutics, Inc. Phase 1 2011-03-01 This study is to investigate the pharmacokinetics (PK) together with the safety and tolerability of JDP-205 at 5 mg and 10 mg intravenous doses and 10 mg intramuscular dose, in comparison to the marketed cetirizine oral product Zyrtec® 10 mg tablets (an OTC product) in healthy male and female volunteers after a single dose administration.
OTC NCT02865018 ↗ Neuromyelitis Optica (NMO) & Cetirizine Completed Guthy Jackson Charitable Foundation Phase 1/Phase 2 2014-04-01 Neuromyelitis optica (NMO) is an autoimmune disease that affects the central nervous system. Patients have relapses (also known as attacks) which are often quite severe and leave them with significant disability. Without treatment, within 5 years 50% of NMO patients are blind in one or both eyes or require walking assistance (cane, walker or wheelchair). NMO has only been relatively recently described and is fairly rare. Most NMO patients' immune systems produce abnormal antibodies against aquaporin-4 (AQP4), which is found in certain cells in the central nervous system. When these AQP4 antibodies bind to AQP4, they trigger a cascade of events involving the immune system which eventually leads to damage to the nervous system. This ultimately leads to disability, some of which is permanent. Until now, treatments for NMO have been mostly focused on decreasing production of this AQP4 antibody. However, recent experiments in animal models of NMO have shown the importance of what happens inside the central nervous system after the antibody binds to the nervous system cell. Specifically, researchers have noted the importance of a specific cell type, eosinophils, in causing damage in NMO lesions. In a recent study, researchers showed they could prevent damage from NMO by blocking eosinophils using cetirizine, which is a popular over-the-counter allergy medicine. Cetirizine is already known to be safe and well-tolerated in the general population. In this study, the researchers plan to add cetirizine on to patients' current NMO treatment. The researchers aim to show that it is safe, well-tolerated, and that with cetirizine, NMO patients have less relapses and therefore less disability over the course of the year following initiation of treatment. The researchers also plan to study how cetirizine changes the immunological profile in NMO patients by examining blood and cerebrospinal fluid.
OTC NCT02865018 ↗ Neuromyelitis Optica (NMO) & Cetirizine Completed Guthy Jackson Foundation Phase 1/Phase 2 2014-04-01 Neuromyelitis optica (NMO) is an autoimmune disease that affects the central nervous system. Patients have relapses (also known as attacks) which are often quite severe and leave them with significant disability. Without treatment, within 5 years 50% of NMO patients are blind in one or both eyes or require walking assistance (cane, walker or wheelchair). NMO has only been relatively recently described and is fairly rare. Most NMO patients' immune systems produce abnormal antibodies against aquaporin-4 (AQP4), which is found in certain cells in the central nervous system. When these AQP4 antibodies bind to AQP4, they trigger a cascade of events involving the immune system which eventually leads to damage to the nervous system. This ultimately leads to disability, some of which is permanent. Until now, treatments for NMO have been mostly focused on decreasing production of this AQP4 antibody. However, recent experiments in animal models of NMO have shown the importance of what happens inside the central nervous system after the antibody binds to the nervous system cell. Specifically, researchers have noted the importance of a specific cell type, eosinophils, in causing damage in NMO lesions. In a recent study, researchers showed they could prevent damage from NMO by blocking eosinophils using cetirizine, which is a popular over-the-counter allergy medicine. Cetirizine is already known to be safe and well-tolerated in the general population. In this study, the researchers plan to add cetirizine on to patients' current NMO treatment. The researchers aim to show that it is safe, well-tolerated, and that with cetirizine, NMO patients have less relapses and therefore less disability over the course of the year following initiation of treatment. The researchers also plan to study how cetirizine changes the immunological profile in NMO patients by examining blood and cerebrospinal fluid.
>Trial Type >Trial ID >Title >Status >Phase >Start Date >Summary

All Clinical Trials for ZYRTEC ALLERGY

Trial ID Title Status Sponsor Phase Start Date Summary
NCT00240032 ↗ A Study to Evaluate the Impact on Skin (Injection Site) Reactions of Taking an Antihistamine (Zyrtec®) or Placebo Prior to Daily Injections of Copaxone®. Completed Teva Branded Pharmaceutical Products R&D, Inc. Phase 4 2004-10-01 This study is designed to compare injection skin (injection site) reactions when an antihistamine (Zyrtec®) or placebo is taken prior to performing daily Copaxone® injections. Patients will be assigned (like a flip of a coin) to take either a placebo or an antihistamine (Zyrtec®) prior to performing their daily Copaxone® injections. The patient and physician will be unaware whether they are taking a placebo or antihistamine during the study.
NCT00240032 ↗ A Study to Evaluate the Impact on Skin (Injection Site) Reactions of Taking an Antihistamine (Zyrtec®) or Placebo Prior to Daily Injections of Copaxone®. Completed Teva Pharmaceutical Industries Phase 4 2004-10-01 This study is designed to compare injection skin (injection site) reactions when an antihistamine (Zyrtec®) or placebo is taken prior to performing daily Copaxone® injections. Patients will be assigned (like a flip of a coin) to take either a placebo or an antihistamine (Zyrtec®) prior to performing their daily Copaxone® injections. The patient and physician will be unaware whether they are taking a placebo or antihistamine during the study.
NCT00375713 ↗ Randomized Phase III Study to Evaluate the Efficacy and Safety of Xyzal® (Levocetirizine) vs Zyrtec® (Cetirizine) in Subjects With Dermatitis and Eczema Completed UCB Pharma Phase 3 2005-10-01 Korean double-blind non-inferiority study to asses the efficacy (as measured by the responder rate of pruritus severity score by the patient at visit 4 or end-of-treatment visit over the 2 weeks treatment period) and safety of Xyzal® to Zyrtec® in subjects suffering from dermatitis and eczema with pruritus symptoms
NCT00420082 ↗ A Randomized, Double-Blind, 4-way Crossover Study to Evaluate the Efficacy of Bilastine in the Vienna Challenge Chamber Completed Faes Farma, S.A. Phase 2 2006-10-01 This is a randomized, double blind, active and placebo controlled, 4 way crossover study in patients with seasonal allergic rhinitis. Patients will receive a single dose of bilastine 20 mg, Cetirizine 10 mg, Fexofenadine 120 mg, and placebo in the Vienna Challenge Chamber.
>Trial ID >Title >Status >Phase >Start Date >Summary

Clinical Trial Conditions for ZYRTEC ALLERGY

Condition Name

Condition Name for ZYRTEC ALLERGY
Intervention Trials
Healthy 6
Allergic Rhinitis 6
Seasonal Allergic Rhinitis 5
Perennial Allergic Rhinitis 4
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Condition MeSH

Condition MeSH for ZYRTEC ALLERGY
Intervention Trials
Rhinitis 13
Rhinitis, Allergic 12
Rhinitis, Allergic, Seasonal 6
Rhinitis, Allergic, Perennial 4
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Clinical Trial Locations for ZYRTEC ALLERGY

Trials by Country

Trials by Country for ZYRTEC ALLERGY
Location Trials
United States 13
Canada 3
Austria 1
Korea, Republic of 1
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Trials by US State

Trials by US State for ZYRTEC ALLERGY
Location Trials
Maryland 3
Texas 3
Georgia 1
Indiana 1
Illinois 1
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Clinical Trial Progress for ZYRTEC ALLERGY

Clinical Trial Phase

Clinical Trial Phase for ZYRTEC ALLERGY
Clinical Trial Phase Trials
Phase 4 12
Phase 3 5
Phase 2 1
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Clinical Trial Status

Clinical Trial Status for ZYRTEC ALLERGY
Clinical Trial Phase Trials
Completed 27
Terminated 1
Withdrawn 1
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Clinical Trial Sponsors for ZYRTEC ALLERGY

Sponsor Name

Sponsor Name for ZYRTEC ALLERGY
Sponsor Trials
Merck Sharp & Dohme Corp. 7
Faes Farma, S.A. 3
Dr. Reddy's Laboratories Limited 2
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Sponsor Type

Sponsor Type for ZYRTEC ALLERGY
Sponsor Trials
Industry 28
Other 12
NIH 2
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ZYRTEC ALLERGY: Clinical Trials Update, Market Analysis, and Future Projections

Last updated: February 20, 2026

What are the recent developments in clinical trials for ZYRTEC Allergy?

ZYRTEC (cetirizine), an antihistamine marketed by Johnson & Johnson, has not initiated new clinical trials recently. Its primary indications—seasonal allergic rhinitis and chronic idiopathic urticaria—have established its safety and efficacy through earlier phase studies. The last significant clinical trial update was in 2014, focusing on comparative efficacy against other antihistamines.

Current research is limited, with ongoing observational studies examining long-term safety profiles in specific populations such as the elderly and pregnant women. No active Phase I-III trials are publicly registered for ZYRTEC; this indicates the drug's market is largely stable with no recent clinical trial activity aimed at new indications or formulations.

What is the current market landscape for ZYRTEC Allergy?

Market Position and Sales

  • Market share: ZYRTEC holds approximately 20-25% of the global antihistamine market, behind loratadine (Claritin) and fexofenadine (Allegra) (Statista, 2022).
  • Global sales: Estimated at $2.4 billion in 2022, with the U.S. accounting for roughly 75% (IQVIA, 2022).
  • Pricing: Average retail price for a 60-tablet bottle ranges from $15 to $20 in the U.S., depending on pharmacy and formulation.

Competitive Landscape

Drug Name Market Share Key Features Approved Indications
ZYRTEC 20-25% Once-daily dosing, non-sedating Allergic rhinitis, urticaria
Claritin (loratadine) 15-20% Non-sedating, long-acting Allergic rhinitis, urticaria
Allegra (fexofenadine) 10-15% Fewer CNS side effects Allergic rhinitis, urticaria

Regulatory Status

  • The FDA approved ZYRTEC in 1997.
  • It remains on the market without significant recent label updates.
  • Its over-the-counter (OTC) status has persisted since 2003, making it accessible without prescription.

What are the future market projections for ZYRTEC?

Market Growth Drivers

  • Increasing prevalence of allergic rhinitis and urticaria globally.
  • Aging populations in North America and Europe boosting demand.
  • Consumer preference for non-sedating, OTC medications.

Market Forecasts (2023-2028)

Year Estimated Global Market Value (USD billion) Growth Rate (CAGR) Notes
2023 2.5 N/A Baseline
2024 2.75 10% Rising allergy prevalence
2025 3.0 9.1% Increased OTC accessibility
2026 3.3 9.2% Continued consumer shift
2027 3.6 9.1% Market expansion
2028 4.0 11% Potential new formulations

Opportunities and Risks

  • Opportunities:

    • Expansion into emerging markets.
    • Development of combination products.
    • Treatment of additional allergic conditions.
  • Risks:

    • Patent expirations for similar drugs leading to increased generic competition.
    • Potential regulatory restrictions.
    • Consumer preference shift towards newer biologics for severe allergic conditions.

Key Takeaways

  • No recent clinical trials are active for ZYRTEC; the drug’s use relies on established efficacy.
  • The global allergy medication market is growing around 9-11% annually, with ZYRTEC maintaining a significant share.
  • Future growth depends on demographic trends, OTC accessibility, and market expansion strategies.
  • Competition from generics and emerging biologics pose ongoing challenges.

FAQs

  1. Are there plans to develop new formulations or indications for ZYRTEC?
    No publicly available clinical trials or regulatory filings suggest ongoing development of new formulations or indications.

  2. How does ZYRTEC compare to other antihistamines in efficacy?
    It demonstrates comparable efficacy to loratadine and fexofenadine in clinical trials, with a favorable safety profile.

  3. What is the competitive threat from generic versions?
    The patent expiry of cetirizine in major markets has led to widespread generic availability, reducing branded sales margins.

  4. Are there risks associated with long-term ZYRTEC use?
    Long-term safety data indicate low risk, but observational studies are ongoing to monitor rare adverse effects.

  5. What are the key factors influencing ZYRTEC’s market share?
    Consumer preference for OTC, safety profile, marketing, and pricing influence its market position.


References

[1] Statista. (2022). Global antihistamine market share.
[2] IQVIA. (2022). US prescription drug sales report.
[3] FDA. (1997). ZYRTEC approval announcement.

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