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Last Updated: April 18, 2025

CLINICAL TRIALS PROFILE FOR ZYRTEC


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505(b)(2) Clinical Trials for Zyrtec

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

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.
NCT00650065 ↗ Fasting Study of Cetirizine HCl Tablets 10 mg and Zyrtec® Tablets 10 mg Completed Mylan Pharmaceuticals Phase 1 2002-11-01 "The objective of this study was to investigate the bioequivalence of Mylan cetirizine HCl 10 mg tablets to Pfizer's Zyrtec® 10 mg tablets following a single, oral 10 mg (1 x 10 mg) dose administration under fasting conditions.
>Trial ID >Title >Status >Phase >Start Date >Summary

Clinical Trial Conditions for Zyrtec

Condition Name

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

Trials by Country

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

Trials by US State for Zyrtec
Location Trials
Maryland 3
Texas 3
North Carolina 1
Tennessee 1
Georgia 1
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Clinical Trial Progress for Zyrtec

Clinical Trial Phase

Clinical Trial Phase for Zyrtec
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
Clinical Trial Phase Trials
Completed 27
Terminated 1
Withdrawn 1
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Clinical Trial Sponsors for Zyrtec

Sponsor Name

Sponsor Name for Zyrtec
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
Sponsor Trials
Industry 28
Other 12
NIH 2
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ZYRTEC: Clinical Trials, Market Analysis, and Projections

Clinical Trials and Efficacy of ZYRTEC

Overview of Clinical Studies

ZYRTEC, also known as cetirizine hydrochloride, has undergone extensive clinical trials to establish its efficacy and safety. These trials involved various patient groups, including adults and children, to treat allergic conditions such as allergic rhinitis, urticaria, and asthma.

Efficacy in Allergic Conditions

In nine multicenter, randomized, double-blind clinical trials, cetirizine was compared to placebo in patients aged 12 years and older. These studies showed that cetirizine significantly reduced symptoms of allergic rhinitis and inhibited the wheal and flare response caused by histamine injection. The effects were observed within 20 minutes in 50% of subjects and persisted for at least 24 hours[1].

Pediatric Studies

In pediatric patients aged 5 to 12 years, cetirizine demonstrated strong antihistaminic effects without showing tolerance over a 35-day period. For infants aged 7 to 25 months, cetirizine administered orally resulted in a significant inhibition of histamine-induced wheal and flare responses[1].

Asthma and Other Conditions

In mildly asthmatic subjects, cetirizine blocked bronchoconstriction due to nebulized histamine, with total blockade observed at a 20-mg dose. Additionally, cetirizine inhibited the late phase recruitment of eosinophils, neutrophils, and basophils in response to cutaneous antigen challenges[1].

Safety Profile

Clinical trials also focused on the safety profile of ZYRTEC. Studies showed no significant mean increases in QTc interval, a measure of heart rhythm, even at doses up to 60 mg per day, which is six times the maximum clinical dose. This was consistent across various combinations with other medications such as erythromycin, ketoconazole, and azithromycin[1].

Market Analysis of ZYRTEC

Global Market Trends

The antihistamine market, which includes ZYRTEC, is experiencing steady growth driven by increasing prevalence of allergic diseases and substantial R&D investments. The global antihistamine market grew from USD 265.34 million in 2023 to USD 279.74 million in 2024 and is projected to reach USD 381.39 million by 2030, with a CAGR of 5.31%[5].

Market Segmentation

The market is segmented by drug type, route of administration, diseases treated, end users, and formulation. ZYRTEC, being a second-generation antihistamine, holds a significant share in the market due to its efficacy and safety profile.

Regional Analysis

The global ZYRTEC market is analyzed at regional and country levels. The report provides insights into market penetration, development opportunities, and competitive assessments across different regions. Emerging markets are expected to contribute significantly to the growth of the antihistamine market, including ZYRTEC[2][5].

Competitive Landscape

The competitive landscape of the antihistamine market is dominated by key players such as Johnson & Johnson, Sanofi, Pfizer, and Bayer. These companies are investing heavily in R&D, product innovations, and strategic expansions to maintain their market share. ZYRTEC, being a well-established brand, continues to be a major player in this competitive environment[5].

Projections and Future Outlook

Market Growth Projections

The antihistamine market, including ZYRTEC, is expected to continue its growth trajectory driven by increasing demand for effective allergy treatments. The market is forecasted to grow at a CAGR of 5.31% from 2024 to 2030, reaching a market value of USD 381.39 million by 2030[5].

Emerging Trends and Opportunities

Emerging trends include the development of new formulations and delivery methods, such as intravenous cetirizine for acute urticaria, which is expected to offer cost savings and improved patient outcomes in emergency department settings[3].

Technological and R&D Advancements

Continuous R&D efforts are focused on improving the efficacy and safety of antihistamines. Innovations in manufacturing and technological advancements are expected to drive the market forward, with a focus on personalized medicine and targeted therapies[5].

Budget Impact and Cost-Effectiveness

Hospital Formulary and Cost Savings

The adoption of intravenous cetirizine on hospital formularies is projected to result in cost savings. Studies have shown that IV cetirizine can reduce the need for return visits and decrease the overall cost of treating acute urticaria compared to traditional treatments like IV diphenhydramine[3].

Key Takeaways

  • Efficacy and Safety: ZYRTEC has demonstrated strong efficacy in treating allergic conditions with a favorable safety profile, including minimal impact on QTc interval.
  • Market Growth: The global antihistamine market, including ZYRTEC, is projected to grow at a CAGR of 5.31% from 2024 to 2030.
  • Competitive Landscape: Key players like Johnson & Johnson, Sanofi, Pfizer, and Bayer dominate the market, with ZYRTEC being a significant brand.
  • Emerging Trends: New formulations and delivery methods, such as IV cetirizine, are expected to offer cost savings and improved patient outcomes.
  • R&D and Innovations: Continuous R&D efforts are driving the market forward with a focus on personalized medicine and targeted therapies.

FAQs

What is the primary use of ZYRTEC?

ZYRTEC (cetirizine hydrochloride) is primarily used to treat allergic conditions such as allergic rhinitis, urticaria, and asthma.

How quickly does ZYRTEC take effect?

ZYRTEC starts to take effect within 20 minutes in 50% of subjects and within one hour in 95% of subjects, with effects persisting for at least 24 hours[1].

Is ZYRTEC safe for pediatric use?

Yes, ZYRTEC has been shown to be safe and effective in pediatric patients, including infants as young as 7 months, with no significant adverse effects or tolerance development over time[1].

What is the projected market value of the antihistamine market by 2030?

The antihistamine market is projected to reach USD 381.39 million by 2030, growing at a CAGR of 5.31% from 2024 to 2030[5].

How does intravenous cetirizine impact hospital budgets?

The adoption of intravenous cetirizine on hospital formularies is expected to result in cost savings by reducing the need for return visits and decreasing the overall cost of treating acute urticaria[3].

Which companies are major players in the antihistamine market?

Key players in the antihistamine market include Johnson & Johnson, Sanofi, Pfizer, and Bayer, with ZYRTEC being a significant brand[5].

Sources

  1. FDA Label for Zyrtec: "Zyrtec (cetirizine hydrochloride) tablets and syrup for oral use" - FDA.
  2. Zyrtec Market Report 2024: "Global Zyrtec Market Report 2024" - Cognitive Market Research.
  3. Budget Impact of IV Cetirizine: "Budget Impact of Intravenous Cetirizine Hydrochloride for the Treatment of Acute Urticaria in the Emergency Department Setting" - AHDB Online.
  4. Cetirizine, Loratadine, or Placebo in Subjects with Seasonal Allergic Rhinitis: "Cetirizine, loratadine, or placebo in subjects with seasonal allergic rhinitis" - Journal of Allergy and Clinical Immunology.
  5. Antihistamine Drugs Industry Report 2025-2030: "Antihistamine Drugs Market by Drug Type, Route of Administration, Diseases Treated, End User, Formulation - Global Forecast 2025-2030" - GlobeNewswire.

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