Levocetirizine

Prescription ·Exploratory record · not publication-reviewed ·Updated July 13, 2026

Levocetirizine is the active R-enantiomer of cetirizine and is used for allergic rhinitis and chronic idiopathic urticaria. It is generally less sedating than first-generation antihistamines but can still cause somnolence and requires renal dose adjustment because it is substantially excreted by the kidneys.

Exploratory record, not a reviewed medical publication.

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This generated database record has not completed a claim-level review by a qualified human medical reviewer. Bibliography links and evidence labels are not approval. The page remains available for reference and is excluded from search indexing.

In short

What the research says.

A quick, data-only summary. The full evidence, dosing, and sources are below.

Levocetirizine is the active R-enantiomer of cetirizine and is used for allergic rhinitis and chronic idiopathic urticaria. NutriStack rates the supporting evidence as strong. Common adult dosing is Adults and adolescents: 5 mg orally once daily in the evening; some patients may respond to 2.5 mg once daily. Dose reduction is required in renal impairment., though a prescriber sets the actual dose. This profile indexes 3 sources.

What it's good for

Relief of seasonal allergic rhinitis symptoms^2,3
Relief of perennial allergic rhinitis symptoms^2,3
Reduction of itching and hives in chronic idiopathic urticaria^1,3

What to watch for

Somnolence
Fatigue
Dry mouth
Known hypersensitivity to levocetirizine, cetirizine, hydroxyzine, or formulation components^1,3
End-stage renal disease or hemodialysis for some products³

The bottom line

Evidence rating strong. Most-documented uses: relief of seasonal allergic rhinitis symptoms, relief of perennial allergic rhinitis symptoms, reduction of itching and hives in chronic idiopathic urticaria. 3 sources indexed (2006–2026), with 0 interaction records on file.

The science

How it works, mechanistically.

Core mechanism

Levocetirizine selectively antagonizes peripheral histamine H1 receptors, reducing histamine-mediated itching, sneezing, rhinorrhea, and wheal-and-flare reactions. It has limited central penetration compared with older antihistamines but still can impair alertness in some patients. Renal elimination makes exposure higher in kidney impairment.^1,3

Class

Second-generation H1 antihistamine

Dosing

Dosing & protocol.

Common range

Adults and adolescents: 5 mg orally once daily in the evening; some patients may respond to 2.5 mg once daily. Dose reduction is required in renal impairment.

Recommended form

Oral tablet or oral solution, often taken in the evening

May be taken with or without food. Avoid alcohol and other sedating products if drowsiness occurs.

Safety

Full safety detail.

Side effects

Somnolence
Fatigue
Dry mouth
Nasopharyngitis
Headache
Dizziness
Urinary retention in susceptible patients
Hypersensitivity reactions rarely

Contraindications

Known hypersensitivity to levocetirizine, cetirizine, hydroxyzine, or formulation components^1,3
End-stage renal disease or hemodialysis for some products³
Use caution and adjust dose in renal impairment³
Avoid alcohol or other CNS depressants when sedation occurs³

Sources

Sources, by evidence tier.

Numbered references. Citations throughout the page link here.

Randomized controlled trials

1Levocetirizine for the treatment of chronic idiopathic urticariaKapp A et al. · Allergy · 2006
Controlled data support reduction of pruritus and wheal symptoms with levocetirizine.

Reviews & position papers

2Allergic Rhinitis and its Impact on Asthma guidelinesBousquet J et al. · Journal of Allergy and Clinical Immunology · 2020
Guidelines support modern H1 antihistamines for rhinitis symptom control with attention to sedation.

Reference material

3Levocetirizine Dihydrochloride Tablets US Prescribing InformationURLU.S. National Library of Medicine · DailyMed · 2026
Labeling describes 5 mg evening dosing, renal impairment adjustments, somnolence, fatigue, and avoidance of alcohol or CNS depressants.

FAQ

Common questions.

Quick answers about Levocetirizine, drawn from the data on this page.

What is Levocetirizine?

What is Levocetirizine used for?

Commonly cited benefits of Levocetirizine include: Relief of seasonal allergic rhinitis symptoms; Relief of perennial allergic rhinitis symptoms; Reduction of itching and hives in chronic idiopathic urticaria. NutriStack rates the overall evidence as strong.

What is a typical dose of Levocetirizine?

A typical adult dose of Levocetirizine is Adults and adolescents: 5 mg orally once daily in the evening; some patients may respond to 2.5 mg once daily. Dose reduction is required in renal impairment.. The commonly recommended form is Oral tablet or oral solution, often taken in the evening. These are general ranges, not personalized advice; confirm the right dose with a clinician.

What are the side effects of Levocetirizine?

Reported side effects include somnolence, fatigue, dry mouth, nasopharyngitis, headache, dizziness. This is educational information; check with a healthcare professional before use.

How strong is the evidence for Levocetirizine?

NutriStack rates this as Strong, meaning multiple high-quality meta-analyses or systematic reviews converge on the same finding. Full tier criteria are at https://nutristackapp.com/methodology/evidence-tiers.

Use this with your stack

Levocetirizine in NutriStack.

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