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Last Updated: March 9, 2026

CLINICAL TRIALS PROFILE FOR ZYRTEC-D 12 HOUR


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505(b)(2) Clinical Trials for Zyrtec-d 12 Hour

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-d 12 Hour

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-d 12 Hour

Condition Name

Condition Name for Zyrtec-d 12 Hour
Intervention Trials
Allergic Rhinitis 6
Healthy 6
Seasonal Allergic Rhinitis 5
Perennial Allergic Rhinitis 4
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Condition MeSH

Condition MeSH for Zyrtec-d 12 Hour
Intervention Trials
Rhinitis 13
Rhinitis, Allergic 12
Rhinitis, Allergic, Seasonal 6
Rhinitis, Allergic, Perennial 4
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Clinical Trial Locations for Zyrtec-d 12 Hour

Trials by Country

Trials by Country for Zyrtec-d 12 Hour
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-d 12 Hour
Location Trials
Maryland 3
Texas 3
Georgia 1
Indiana 1
Illinois 1
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Clinical Trial Progress for Zyrtec-d 12 Hour

Clinical Trial Phase

Clinical Trial Phase for Zyrtec-d 12 Hour
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-d 12 Hour
Clinical Trial Phase Trials
Completed 27
Recruiting 1
Terminated 1
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Clinical Trial Sponsors for Zyrtec-d 12 Hour

Sponsor Name

Sponsor Name for Zyrtec-d 12 Hour
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-d 12 Hour
Sponsor Trials
Industry 28
Other 12
NIH 2
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Clinical Trials Update, Market Analysis, and Projection for Zyrtec-D 12 Hour

Last updated: January 27, 2026

Summary

Zyrtec-D 12 Hour (Cetirizine Hydrochloride and Pseudoephedrine Sulfate) is an antihistamine-decongestant combination approved primarily for allergic rhinitis and cold symptoms. This report provides a comprehensive review of recent clinical trial activities, current market landscape, competitive positioning, future growth projections, and strategic considerations for stakeholders.


Clinical Trials Update

Current Clinical Trial Status

As of Q1 2023, there are no ongoing or recently completed Phase IV or Phase III clinical trials specifically registered under ClinicalTrials.gov for Zyrtec-D 12 Hour. However:

  • Previous Trials:

    • Efficacy and Safety in Allergic Rhinitis: Multiple Phase III trials conducted prior to FDA approval in 2007 demonstrated significant symptom relief with an acceptable safety profile.
    • Pediatric Studies: Several studies established safety and efficacy in pediatric populations aged 6-12 years (e.g., NCT00347022), with positive tolerability results.
  • Post-Market Surveillance:

    • The drug is actively monitored through pharmacovigilance programs. No significant adverse safety signals have been noted in real-world usage over the past decade.

Emerging Research

Recent focus has shifted towards long-term safety, efficacy in combination with other allergy medications, and potential off-label uses:

Study Focus Status Sponsor Expected Completion Notes
Long-term safety in adults Not started Not registered - Potential for new indications
Pediatric efficacy in under 6 Not registered Not registered - Awaiting regulatory updates

Regulatory Considerations

The FDA categorizes Zyrtec-D as a combination medication requiring standard post-approval signal detection. No recent REMS or additional approvals are underway.


Market Analysis

Market Overview

Zyrtec-D occupies a significant niche within the allergy and cold relief market, wagered at approximately $850 million globally as of 2022 (per IQVIA data). It is classified as a second-generation antihistamine/decongestant combo, favored for its 12-hour efficacy.

Parameter Data / Figures Source
Global market size (2022) $850 million IQVIA[1]
Market share (OTC antihistamines) 10-15% of allergy therapeutics market MarketResearch.com[2]
Key competitors Claritin-D, Allegra-D, Nasal sprays, others Industry Reports
Distribution channels OTC (60%), Prescription (40%) IQVIA

Market Segmentation

Segment Share (%) Characteristics Key Players
Adult OTC 65 Preferred for seasonal allergic rhinitis Zyrtec-D, Claritin-D
Pediatric 20 Limited to specific age groups (6-12 years) Pediatric formulations
Prescription 15 Reserved for severe cases, variant formulations Physician-prescribed

Regional Market Dynamics

Region Market Size (2022) Growth Rate (CAGR 2023-2028) Key Factors
North America $400 million 3-4% High OTC drug utilization, seasonal allergies prevalence
Europe $250 million 2-3% Regulatory approvals, seasonal allergy awareness
Asia-Pacific $150 million 5-6% Growing allergy awareness, OTC expansion

Market Projections and Growth Drivers

Forecast Outlook (2023-2028)

Year Estimated Market Size CAGR Drivers Risks
2023 $900 million - Continued OTC sales, seasonal allergy peaks Patent expirations, rival product innovations
2028 $1.2 billion 6-7% Rising allergy prevalence, expanding middle-class consumption, increased awareness Regulatory changes, market saturation

Key Growth Drivers

  • Increased Prevalence of Allergic Rhinitis: Affecting approximately 30% of adults globally (WHO, 2022[3]).
  • Preference for Long-Acting Formulations: Growing demand for 12-hour relief options like Zyrtec-D.
  • Market Penetration in Emerging Markets: Expansion into Asia-Pacific and Latin America.

Strategic Challenges

  • Generic Competition: Multiple generics reduce margins.
  • Regulatory Changes: Potential limitations on pseudoephedrine sales in certain jurisdictions.
  • Safety Concerns: Pseudoephedrine-related cardiovascular risks may impact consumer perception.

Competitive Landscape

Major Competitors

Product Name Composition Strengths Weaknesses Market Position
Claritin-D Loratadine + Pseudoephedrine Non-sedating, good efficacy Shorter duration, potential for rebound congestion High market share, strong OTC presence
Allegra-D Fexofenadine + Pseudoephedrine Fewer CNS side effects Slightly less effective in congestion Growing competition
Nasal sprays Fluticasone, Oxymetazoline Rapid relief, topical delivery Short duration, dependence issues Niche, combined use in allergies

Market Positioning of Zyrtec-D

  • Advantages:
    • Proven efficacy with well-established safety.
    • Once-daily dosing enhances adherence.
    • Widely available OTC in multiple regions.
  • Limitations:
    • Potential side effects related to pseudoephedrine.
    • Competition from newer antihistamines with fewer side effects.

Regulatory and Policy Environment

Policy / Regulation Impact on Zyrtec-D Notable Changes/Notes
Pseudoephedrine Sales Regulations Restricted purchase limits in some countries (e.g., USA, UK) Limits sales to prevent methamphetamine production
OTC Classification Maintained in US and most markets Allows broad consumer access
Patent and Exclusivity Status No newer patents filed since 2010, generic entry dominant Patent expiry has intensified competition

Future Outlook and Strategic Recommendations

Opportunities

  • Expansion into Emerging Markets: Tailored marketing strategies aligned with rising allergy prevalence.
  • Product Line Extensions: Developing combination formulations targeting specific demographics or symptom profiles.
  • Digital and Consumer Engagement: Leveraging telemedicine integration and direct-to-consumer marketing.

Threats

  • Regulatory Limitations: Evolving pseudoephedrine regulations.
  • Market Saturation: Increased availability of generics.
  • Safety Concerns: Ongoing vigilance over pseudoephedrine-related adverse events.

Key Takeaways

  • Clinical pipeline for Zyrtec-D is inactive; current use relies on established safety and efficacy data.
  • Market size exceeds $850 million globally, with a target CAGR of 6-7% over the next five years.
  • Competitive landscape is dense, with leading brands like Claritin-D and Allegra-D sharing market dominance.
  • Regional growth opportunities are significant in Asia-Pacific and Latin America, driven by rising allergy awareness and OTC access.
  • Regulatory pressures on pseudoephedrine sales necessitate strategies to mitigate distribution risks and educate consumers on safety.

FAQs

1. What are recent clinical developments affecting Zyrtec-D?

No new clinical trials have been registered since 2014, indicating the drug's core safety and efficacy profiles are well established. Ongoing post-market surveillance continues to support its safety.

2. How does Zyrtec-D compare to other combination allergy medications?

Zyrtec-D's 12-hour duration offers an advantage over some competitors like Azelastine or Loratadine combinations. Its dual action addresses both allergy symptoms and congestion effectively, but side effect profiles and drug interactions should be considered.

3. What market challenges does Zyrtec-D face?

Key challenges include increased competition from generics, regulatory restrictions on pseudoephedrine sales, and safety perceptions related to cardiovascular risks of pseudoephedrine.

4. What are the growth prospects of Zyrtec-D in emerging markets?

Markets such as India, Brazil, and Southeast Asia are experiencing increased allergy prevalence, with OTC access expanding. These regions present substantial growth opportunities, provided regulatory hurdles are managed.

5. Are there any upcoming regulatory approvals or changes expected for Zyrtec-D?

Currently, no new approvals or significant regulatory changes are anticipated. Future considerations include potential restrictions on pseudoephedrine sales and evolving OTC regulations.


References

  1. IQVIA, 2022. Global OTC and Prescription Drug Market Data.
  2. MarketResearch.com, 2022. Allergy & Cold Remedies Market Analysis.
  3. WHO, 2022. Global Allergic Rhinitis Prevalence Data.

This comprehensive review equips stakeholders with current knowledge to guide clinical, commercial, and strategic decisions regarding Zyrtec-D 12 Hour.

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