Last Updated: May 1, 2026

CLINICAL TRIALS PROFILE FOR CETIRIZINE HYDROCHLORIDE ALLERGY


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505(b)(2) Clinical Trials for Cetirizine Hydrochloride 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.
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 Cetirizine Hydrochloride Allergy

Trial ID Title Status Sponsor Phase Start Date Summary
NCT00150761 ↗ Facial Thermography Study of Levocetirizine Versus Cetirizine Completed UCB Pharma Phase 4 2004-07-01 Phase IV, human pharmacology, exploratory, randomized, 3-way (3 treatment periods) cross-over, double blind, double dummy, placebo controlled study to compare levocetirizine and cetirizine by means of IR thermography.
NCT00189397 ↗ Azathioprine Versus Corticosteroids in Parthenium Dermatitis Completed All India Institute of Medical Sciences, New Delhi N/A 2003-02-01 The dermatitis caused by the substances which come in contact with the skin is known as contact dermatitis. When such a reaction is caused by the agents suspended in the air, it is called air-borne contact dermatitis (ABCD). Parthenium hysterophorus at present is the commonest cause of ABCD in India though in some cases other plants have also been found to cause ABCD. Parthenium dermatitis is one of the major health problems in dermatology in our country. Though it has very little mortality, the disease normally continues to persist with variable remissions and relapses causing great distress and morbidity. Corticosteroids, topical and systemic have been the mainstay of the treatment so far. Therefore, the patients with ABCD who have to take corticosteroids for long periods of time tend to develop severe and sometimes irreversible side effects of the therapy. Azathioprine is an immunosuppressive drug which acts by inhibiting the T lymphocytes. In our previous studies we have been able to induce remissions in these patients with azathioprine used as daily as well as monthly bolus dose, without having to use systemic corticosteroids. The side effect with azathioprine in these studies were almost absent. We have therefore planned to study the therapeutic efficacy of azathioprine weekly pulse doses versus daily azathioprine in achieving remissions in patients having Parthenium dermatitis and to monitor the side effects of both the regimens.
NCT00253058 ↗ Study Of Perennial Allergic Rhinitis In Pediatrics Completed GlaxoSmithKline Phase 3 2005-07-01 To verify of cetirizine dry syrup to ketotifen dry syrup in the change of total nasal symptom score (TNSS) over the total treatment period from the score of the baseline assessment period
NCT00257569 ↗ Study Of Atopic Dermatitis In Pediatrics Completed GlaxoSmithKline Phase 3 2005-08-01 To verify of cetirizine dry syrup to ketotifen dry syrup in the change in the severity of pruritus of the treatment period.
NCT00257582 ↗ Study Of Cutaneous Disease Accompanied With Pruritus In Pediatrics Completed GlaxoSmithKline Phase 3 2005-08-01 To assess the safety of long-term use of cetirizine dry syrup in children with various type of cutaneous disease accompanied on pruritus.
NCT00257595 ↗ Perennial Allergic Rhinitis In Pediatric Subjects Completed GlaxoSmithKline Phase 3 2005-08-01 To assess the safety of long-term use of cetirizine dry syrup in children with perennial allergic rhinitis.
NCT00291642 ↗ A Study to Compare the Efficacy of Levocetirizine to Placebo in Reducing Symptoms of Seasonal Allergic Rhinitis (SAR) in Sensitive Subjects Exposed to Ragweed Pollen Completed UCB Pharma Phase 2 2006-01-01 The purpose of the study is to assess the efficacy comparability of cetirizine and levocetirizine, by comparing the effects of single intake of the two drugs to placebo in reducing symptoms of seasonal allergic rhinitis (SAR) in ragweed sensitive adult subjects exposed to ragweed pollen in an Environmental Exposure Unit.
>Trial ID >Title >Status >Phase >Start Date >Summary

Clinical Trial Conditions for Cetirizine Hydrochloride Allergy

Condition Name

Condition Name for Cetirizine Hydrochloride Allergy
Intervention Trials
Allergic Rhinitis 11
Seasonal Allergic Rhinitis 9
Healthy 9
Urticaria 6
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Condition MeSH

Condition MeSH for Cetirizine Hydrochloride Allergy
Intervention Trials
Rhinitis, Allergic 34
Rhinitis 34
Rhinitis, Allergic, Seasonal 15
Urticaria 12
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Clinical Trial Locations for Cetirizine Hydrochloride Allergy

Trials by Country

Trials by Country for Cetirizine Hydrochloride Allergy
Location Trials
United States 56
Canada 13
Germany 5
Italy 3
Egypt 3
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Trials by US State

Trials by US State for Cetirizine Hydrochloride Allergy
Location Trials
Texas 9
Massachusetts 4
Maryland 4
Pennsylvania 3
Ohio 3
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Clinical Trial Progress for Cetirizine Hydrochloride Allergy

Clinical Trial Phase

Clinical Trial Phase for Cetirizine Hydrochloride Allergy
Clinical Trial Phase Trials
PHASE3 2
Phase 4 24
Phase 3 21
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Clinical Trial Status

Clinical Trial Status for Cetirizine Hydrochloride Allergy
Clinical Trial Phase Trials
Completed 70
Recruiting 12
Unknown status 4
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Clinical Trial Sponsors for Cetirizine Hydrochloride Allergy

Sponsor Name

Sponsor Name for Cetirizine Hydrochloride Allergy
Sponsor Trials
GlaxoSmithKline 12
UCB Pharma 6
Merck Sharp & Dohme Corp. 5
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Sponsor Type

Sponsor Type for Cetirizine Hydrochloride Allergy
Sponsor Trials
Industry 70
Other 51
NIH 2
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Cetirizine Hydrochloride Allergy Market Analysis and Financial Projection

Last updated: April 28, 2026

Cetirizine Hydrochloride Allergy: Clinical Trials Update, Market Analysis, and Projection

What is the current clinical-trials picture for cetirizine hydrochloride?

Cetirizine hydrochloride (2-[4-[(4-chlorophenyl)-phenylmethyl]-1-piperazinyl]ethoxy]acetic acid, HCl) is a well-established second-generation antihistamine and is widely marketed globally. Clinical development in recent years centers on formulation optimization, pediatric and special-population use, local bioavailability/BA comparisons, and guideline-aligned endpoints rather than new molecular entity (NME) efficacy demonstrations.

Trial activity pattern (practical view)

  • Pre-approval and label-building work for cetirizine as an active ingredient is largely complete years ago.
  • Modern trial work is dominated by:
    • Bioequivalence (BA/BE) studies across generics and reformulations (tablets, ODT, syrup/drops, extended-release where applicable).
    • Safety and tolerability studies in pediatrics and special populations.
    • Real-world effectiveness studies and seasonal allergy studies conducted under standard antihistamine endpoints (itching, sneezing, nasal symptoms, quality-of-life scores).

Regulatory stance that shapes trials

  • In the US and EU, new entrants typically pursue ANDA/505(b)(2) pathways (US) or generic/abridged approvals (EU), which shifts trial burden away from phase 3 superiority trials for a known antihistamine active. This suppresses the visibility of “true” phase 3 programs in public registries versus BA/BE and small clinical studies.

Clinical endpoints commonly used in cetirizine trials

  • Nasal symptoms (congestion, rhinorrhea, sneezing)
  • Ocular symptoms (itching, tearing) in allergic rhinitis studies
  • Itch and wheal-related endpoints in urticaria settings
  • Patient-reported symptom scales and quality-of-life instruments

What does the market look like today for cetirizine hydrochloride allergy?

Cetirizine is a mass-market allergy medicine and typically tracks:

  • Seasonal allergic rhinitis (SAR) peaks (spring/fall depending on geography)
  • Pediatric allergy demand (drops/syrup formats)
  • Generics penetration and retail-channel mix

Market structure

  • Revenue drivers: cold-season and spring allergy seasons, pharmacy stocking cycles, and consumer switching within the OTC/behind-the-counter antihistamine class.
  • Pricing pressure: high generics penetration in most mature markets.
  • Channel split: prescription-to-OTC varies by country; in many markets cetirizine is OTC, shifting competition toward brand recognition, pack size, and speed of symptom relief.

Competitive set

  • Other second-generation antihistamines with overlapping indications include:
    • Loratadine
    • Fexofenadine
    • Levocetirizine
    • Desloratadine
  • Market share is driven by:
    • Price and promo intensity
    • Brand/formulation differentiation (fast-dissolve, pediatric palatability, pack formats)
    • Safety perceptions (sedation profile relative to first-generation agents)

Key implication for R&D investment For cetirizine, incremental commercial wins usually come from:

  • Reformulations that improve convenience, pediatric dosing adherence, or pharmacokinetic consistency
  • Switching/market-entry strategies (new generic, new dosage form, or expanded labeling via local studies)

How should you project market performance for cetirizine hydrochloride through 2030?

A projection for cetirizine has to be built around structural forces: generics volume, OTC demand, and macro drivers (population, allergy prevalence, urbanization) offset by substitution across second-generation antihistamines.

Projection framework (directionally robust)

  1. Volume growth: supported by demographic growth and baseline allergy burden.
  2. Value growth: constrained by generic pricing, but can be cushioned by:
    • Higher uptake of pediatric formats
    • OTC expansion and larger pack sizes
    • Price stabilization during periods of supply normalization
  3. Share rotation within class: fexofenadine/loratadine/levocetirizine compete for the same symptom segments.

Base-case market projection (qualitative to decision-useful ranges)

  • Global market growth outlook: low-to-mid single-digit CAGR in value terms through 2030, with volume growth outpacing value growth due to generics.
  • Mature-market behavior: slower value growth; stability supported by chronic and seasonal repeat use.
  • Emerging-market behavior: higher volume growth; value growth still capped by generics and price controls.

What can change the projection

  • Expanded regulatory guidance that encourages certain antihistamines in pediatric or specific rhinitis phenotypes
  • Major safety communications that shift consumer sentiment (positive or negative)
  • New formulation launches that increase compliance or reduce dosing frequency (if any dosage form achieves meaningful differentiation)

What commercial and regulatory signals matter most for decision-making now?

Cetirizine is not a “new drug” problem. It is a “portfolio and channel execution” problem.

Signals that predict near-term performance

  • Ongoing BA/BE and formulation trials that enable market launches for:
    • New strengths/dosage forms
    • Pediatric-ready formats
    • Reformulated stability improvements
  • Retail and PBM stocking patterns that reflect:
    • Store brand uptake
    • Pharmacy preference for reliable supply and predictable pricing
  • Seasonal consumption cycles and inventory behavior ahead of allergy seasons

Signals to track

  • Approval and launch cadence of generic cetirizine formulations in key geographies
  • Evidence of label expansion in local jurisdictions (pediatric dosing, urticaria claims)
  • Substitution rates within the antihistamine class (especially against levocetirizine and fexofenadine in markets where sedation perception matters)

Where do clinical trials and filings typically land for cetirizine?

Given cetirizine’s established status, the trial landscape usually separates into:

  • Bioequivalence trials: single-dose and/or steady-state, comparing generic formulations to a reference product, often in fed and fasted states.
  • Pediatric formulation studies: palatability, dosing accuracy, and safety monitoring in children.
  • Seasonal allergic rhinitis studies: randomized, placebo-controlled or comparator studies using standardized symptom scales, often smaller than classic phase 3 because active efficacy is already validated.

What is the risk profile for cetirizine-focused investments?

  • Low scientific risk: mechanism and efficacy are known; regulators accept standard antihistamine efficacy endpoints historically.
  • High commercial execution risk: price compression, substitution, and channel promotion determine outcomes.
  • Regulatory risk is usually manageable: generics pathways reduce uncertainty, but post-approval compliance, stability, and manufacturing controls remain decisive.

Key Takeaways

  • Cetirizine’s clinical activity in recent years is mostly BA/BE, formulation optimization, and population-specific safety studies rather than new efficacy-defining phase 3 trials.
  • The market is mature and generics-driven, with value growth limited by price competition and value stability influenced by OTC adoption, pack strategy, and seasonal usage cycles.
  • Through 2030, global value growth is most plausibly low-to-mid single digits while volume growth remains stronger, with performance hinging on formulation differentiation and distribution execution.
  • Competitive outcomes will track substitution within the second-generation antihistamine class, especially against fexofenadine, loratadine, and levocetirizine.

FAQs

1) Is cetirizine still undergoing major phase 3 development?

Most visible recent work is BA/BE and formulation or population-focused studies rather than new phase 3 superiority programs, consistent with cetirizine’s established efficacy and the dominance of generics pathways.

2) What endpoints matter most in cetirizine allergy trials?

Standard antihistamine symptom scores (nasal symptoms, ocular symptoms in allergic rhinitis) and patient-reported outcomes, plus safety and tolerability, are the core endpoints used to support labeling and formulation acceptance.

3) What is the main market driver: seasonal allergy or chronic use?

Seasonal allergic rhinitis drives recurring demand peaks, while ongoing mild allergy management supports baseline volume. The combined pattern typically tracks allergy calendars in each geography.

4) How does generics penetration affect revenue projections?

Generics penetration compresses pricing and makes value growth slower than volume growth. Projections typically assume stable demand but constrained margins unless differentiated formulations or channel strategy offset price erosion.

5) Which competitors most impact cetirizine share?

Other second-generation antihistamines (loratadine, fexofenadine, levocetirizine, desloratadine) compete on symptom overlap, safety perceptions, and pricing across both OTC and prescription channels.


References

[1] FDA. “Drugs@FDA: FDA-Approved Drugs.” US Food and Drug Administration. https://www.accessdata.fda.gov/scripts/cder/daf/
[2] EMA. “Human medicines: Marketing authorisations.” European Medicines Agency. https://www.ema.europa.eu/en/human-regulatory/marketing-authorisation
[3] WHO Collaborating Centre for Drug Statistics Methodology. “ATC/DDD Index.” World Health Organization. https://www.whocc.no/atc_ddd_index/
[4] ClinicalTrials.gov. “Cetirizine hydrochloride.” US National Library of Medicine. https://clinicaltrials.gov/

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