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Levocetirizine

 

1. Generic Name & Brand Names

  • Generic Name: Levocetirizine

  • Common Brands:

    • Xyzal® (Global)

    • Lezina® (India)

    • Vozet® (EU)

    • Generic equivalents (e.g., "Levocetirizine Dihydrochloride")

2. Dosage Forms

  • Oral:

    • Tablets (5 mg)

    • Oral Solution (0.5 mg/mL)

  • No topical/injectable forms

3. Drug Class

  • Active Enantiomer of Cetirizine

  • Second-Generation H₁ Antihistamine

  • Non-sedating (lower risk than 1st-gen)

4. Uses

  • Allergic Rhinitis: Seasonal/perennial

  • Chronic Idiopathic Urticaria: Hives of unknown cause

  • Itch Relief: Eczema, insect bites

  • Not for asthma or anaphylaxis

5. Side Effects

Common (1-10%)Rare (<1%)
FatigueTachycardia
Dry mouthSevere hypersensitivity
HeadacheSeizures
Minimal drowsinessUrinary retention
PharyngitisHepatitis

6. Key Warnings

  • Renal Impairment:

    • ↓ Dose if CrCl <50 mL/min:

      • CrCl 30-50: 2.5 mg daily

      • CrCl 10-30: 2.5 mg every other day

  • Pregnancy/Lactation:

    • Category B: Use only if benefits > risks

    • Excreted in breast milk

  • Contraindications:

    • End-stage renal disease (CrCl <10)

    • Hypersensitivity to cetirizine/piperazine derivatives

7. How to Take

GroupDoseTiming
Adults & ≥12 years5 mg once dailyEvening
Children 6-11 years2.5 mg once dailyEvening
Children 2-5 years1.25 mg (1.25mL)Evening

  • Key Notes:

    • Take on empty stomach (food delays absorption)

    • Max duration: 6 months for chronic urticaria without medical review

8. Missed Dose

  • Take ASAP if <12 hours late

  • Skip if >12 hours; resume next scheduled dose

  • Never double dose

9. Overdose

  • Symptoms: Drowsiness (adults), agitation (children), tachycardia

  • Management:

    • Symptomatic treatment

    • Hemodialysis ineffective (94% protein-bound)

10. Drug Interactions

MedicationEffect
Theophylline↑ Levocetirizine levels (20%)
CNS DepressantsPotentiate drowsiness (alcohol, opioids)
Ritonavir↑ AUC (use with caution)

11. Storage

  • Temperature: 15-30°C (59-86°F)

  • Oral Solution: Discard 6 months after opening

  • Protect from light/humidity

Critical Safety Notes:

⚠️ Renal Dosing Essential:

  • Mandatory dose adjustment for kidney patients - check CrCl before prescribing.

⚠️ Driving Precautions:

  • 3-4% experience drowsiness - avoid driving until tolerance confirmed.

⚠️ Pediatric Use:

  • Approved for ≥2 years (EU/India) vs. ≥6 months for cetirizine.

⚠️ Allergy Testing:

  • Discontinue ≥72 hours before skin/IgE tests.

OTC Status: Prescription-only in some countries (e.g., US), OTC in others (EU/India).

Onset of Action: 1 hour (faster than cetirizine in some studies).

Levocetirizine vs. Cetirizine:

ParameterLevocetirizineCetirizine
Dose5 mg10 mg
Protein Binding94%93%
Renal Excretion85%70%
Sedation RiskSlightly lowerModerate

Prescribing Tip: Preferred for patients needing reduced daytime drowsiness or renal-adjusted dosing. Always screen for kidney function!


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