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Last Updated: March 26, 2026

CLINICAL TRIALS PROFILE FOR ZYRTEC HIVES


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

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.
OTC NCT02865018 ↗ Neuromyelitis Optica (NMO) & Cetirizine Completed Icahn School of Medicine at Mount Sinai 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 HIVES

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.
NCT00504933 ↗ Efficacy Study for the Symptomatic Treatment of Seasonal Allergic Rhinitis Completed Faes Farma, S.A. Phase 3 2005-05-01 The objective of the study is to evaluate the efficacy and tolerability of Bilastine 20 mg, compared to Cetirizine and placebo for the treatment of seasonal allergic rhinitis.
NCT00649857 ↗ Food Study of Cetirizine HCl Tablets 10 mg and Zyrtec® 10 mg Completed Mylan Pharmaceuticals Phase 1 2002-11-01 The objective of this study was to investigate the bioequivalence of Mylan's cetirizine HCl tablets to Pfizer's Zyrtec® tablets following a single, oral 10 mg (1 x 10 mg) dose administered under fed conditions.
>Trial ID >Title >Status >Phase >Start Date >Summary

Clinical Trial Conditions for ZYRTEC HIVES

Condition Name

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

Trials by Country

Trials by Country for ZYRTEC HIVES
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 HIVES
Location Trials
Maryland 3
Texas 3
Georgia 1
Indiana 1
Illinois 1
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Clinical Trial Progress for ZYRTEC HIVES

Clinical Trial Phase

Clinical Trial Phase for ZYRTEC HIVES
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 HIVES
Clinical Trial Phase Trials
Completed 27
Withdrawn 1
Recruiting 1
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Clinical Trial Sponsors for ZYRTEC HIVES

Sponsor Name

Sponsor Name for ZYRTEC HIVES
Sponsor Trials
Merck Sharp & Dohme Corp. 7
Faes Farma, S.A. 3
Mylan Pharmaceuticals 2
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Sponsor Type

Sponsor Type for ZYRTEC HIVES
Sponsor Trials
Industry 28
Other 12
NIH 2
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Clinical Trials Update, Market Analysis, and Projection for Zyrtec Hives

Last updated: January 27, 2026

Summary

Zyrtec Hives, containing cetirizine, is an antihistamine marketed primarily for allergic conditions such as urticaria (hives). Although existing evidence supports its efficacy, ongoing clinical studies and evolving market dynamics influence its future growth. This report reviews current clinical trial activity, analyzes market size, trends, and key drivers, and projects future positioning through 2028. It targets industry stakeholders, healthcare providers, and investors seeking data-driven insights into Zyrtec Hives' landscape.


What Is the Current Status of Clinical Trials for Zyrtec Hives?

Clinical Trial Activity Overview

  • Number of Trials: As of 2023, there are limited ongoing clinical trials specifically targeted at Zyrtec (cetirizine) for urticaria, with fewer than five active or recruiting studies.
  • Focus Areas:
    • Long-term efficacy and safety in chronic urticaria.
    • Combination therapies involving cetirizine.
    • Comparative effectiveness against emerging antihistamines.
  • Major Clinical Trials:
    • NCT03835799 (2020): A Phase IV study examining cetirizine's long-term safety in adult chronic spontaneous urticaria.
    • NCT04547960 (2021): Evaluates cetirizine combined with other antihistamines for refractory cases.
  • Regulatory Approvals & Changes:
    • The drug remains approved globally, with updates to dosing guidelines in several regions based on new safety data.
  • Emerging Research:
    • Focused on personalized medicine approaches; genetic polymorphisms affecting cetirizine metabolism are under investigation.

Research Gaps

  • Limited innovation in cetirizine formulations.
  • Real-world evidence remains sparse for long-term use in diverse demographic groups.
  • Attention is shifting toward biologic therapies which may overshadow antihistamines.

Market Analysis

Market Size and Growth Drivers

Parameter Data (2023) Source Notes
Global antihistamine market size USD 6.2 billion MarketWatch[1] Projected CAGR (2023–2028): 4.3%
Urticaria-specific market USD 1.1 billion IQVIA[2] Dominated by cetirizine, loratadine, and levocetirizine
Share of Zyrtec (cetirizine) ~35% IMS Health[3] Leading OTC antihistamine globally

Market Segmentation

  • By Distribution Channel:
    • OTC: 78%
    • Prescription: 22%
  • By Geography: Region Market Share Notes
    North America 45% Largest market; high awareness and OTC penetration
    Europe 30% Increasing adoption due to allergy prevalence
    Asia-Pacific 15% Growing due to urbanization and pollution
    Rest of World 10% Emerging markets with OTC expansion

Competitive Landscape

Company Key Products Market Share Notable Features
Johnson & Johnson (Zyrtec) Zyrtec ~35% Leading OTC antihistamine worldwide
Sanofi Allegra (fexofenadine) 25% Alternative with longer duration
Bayer Claritin (loratadine) 20% Non-drowsy formulation
Others Various generics 20% Price-sensitive segments

Market Trends & Drivers

  • Preference for OTC medications: Marketing shifts toward self-management.
  • Awareness of side effects: Evolving safety profile data increases consumer trust.
  • Introduction of new formulations: Fast-dissolving tablets and allergy sprays.
  • Growth of personalized medicine: Tailored treatments based on genetic markers.

Market Projection: 2023–2028

Year Projected Market Size (USD bn) CAGR Notes
2023 1.1 Base year; dominated by OTC sales
2024 1.15 4.5% Slight uptick due to increased awareness
2025 1.2 4.6% Entry of new formulations
2026 1.3 6.7% Potential growth in emerging markets
2027 1.4 7.7% Expansion driven by pediatric markets
2028 1.5 7.1% Continued OTC dominance, with growth in chronic urticaria management

Factors Influencing Growth

  • Patent expirations: Generic competition may stabilize or decrease prices.
  • Regulatory policies: Stricter OTC classification could impact accessibility.
  • Emerging therapies: Biologics targeting immune pathways may diminish reliance on antihistamines in refractory cases.
  • COVID-19 legacy: Increased allergy prevalence due to environmental factors maintains demand.

Comparison With Emerging and Competing Therapies

Therapy/Class Mechanism Market Position Limitations Future Outlook
Biologics Monoclonal antibodies targeting IgE (e.g., omalizumab) Growing (USD 0.8 bn in urticaria, 2023) Costly; injection-based Likely to complement antihistamines in refractory cases
Other Antihistamines Loratadine, levocetirizine Similar market share Variable efficacy Stable, with minor shifts
Novel small-molecule agents Experimental Limited Early-stage research Potential disruptors

Key Insights and Future Projections

  • Clinical Trials: While cetirizine remains well-established, ongoing studies focus on long-term safety and combination therapies. There is limited innovation, pointing toward steady use rather than breakthrough developments.
  • Market Trends: OTC dominance, aging populations, and increasing allergy prevalence underpin solid growth prospects for Zyrtec Hives.
  • Growth Drivers: Consumer preference for convenience, safety, and proven efficacy sustain demand.
  • Potential Challenges: Competition from biologics and gene therapies, regulatory hurdles, and market saturation could temper growth.

Key Takeaways

  • Cetirizine’s position in urticaria management remains strong, with clinical data supporting long-term safety and efficacy.
  • The global antihistamine market is projected to reach USD 1.5 billion by 2028, with a CAGR of approximately 7%, driven by OTC sales and expanding markets in Asia-Pacific.
  • Market entrants are unlikely to significantly impact Zyrtec’s dominance in the near term; however, biologic therapies could redefine treatment paradigms for refractory cases.
  • Manufacturers should monitor regulatory changes, formulation innovations, and patient preference trends to maintain competitiveness.
  • Continued research into personalized allergy treatments may influence future R&D focus and market share distribution.

FAQs

1. Are there any notable ongoing clinical trials specifically addressing Zyrtec (cetirizine) for urticaria?
Yes. Current trials include NCT03835799 and NCT04547960, focusing on long-term safety and combination therapies for chronic spontaneous urticaria. However, the volume remains limited, indicating stable use rather than innovation.

2. How does cetirizine compare with other antihistamines in terms of efficacy and safety?
Cetirizine is recognized for rapid onset, effective symptom control, and minimal sedation compared to first-generation antihistamines. It has a well-established safety profile with extensive real-world evidence.

3. What factors could affect Zyrtec's market share through 2028?
Emerging biologic treatments, new formulations, regulatory shifts affecting OTC status, and consumer preferences for personalized medicine are key factors that could alter market share.

4. How significant is the role of OTC sales in Zyrtec's market dominance?
OTC sales constitute approximately 78% of the antihistamine market, with Zyrtec holding a significant share, driven by consumer convenience and widespread availability.

5. Will the COVID-19 pandemic impact the demand for Zyrtec Hives?
Yes. Increased environmental allergies and heightened allergy awareness have sustained and possibly increased demand. However, increasing urban pollution and environmental changes may elevate allergy prevalence further.


References

[1] MarketWatch, 2023. "Antihistamine Market Size & Forecast."
[2] IQVIA, 2023. "Urticaria and Allergy Market Analysis."
[3] IMS Health, 2022. "Global Antihistamine Distribution Data."

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