Comparative Pharmacology
Head-to-head clinical analysis: CHILDREN S ZYRTEC ALLERGY versus CLARINEX D 24 HOUR.
Peer-Reviewed Evidence
Head-to-head clinical analysis: CHILDREN S ZYRTEC ALLERGY versus CLARINEX D 24 HOUR.
CHILDREN'S ZYRTEC ALLERGY vs CLARINEX D 24 HOUR
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Cetirizine is a selective antagonist of peripheral H1 histamine receptors, inhibiting histamine-mediated allergic and inflammatory responses.
Desloratadine is a long-acting tricyclic histamine antagonist with selective peripheral H1-receptor antagonist activity. Loratadine is a long-acting antihistamine that selectively antagonizes peripheral H1-receptors.
5 mg (1 tablet or 5 mL oral solution) once daily; dosing frequency may be increased to 10 mg once daily (2 tablets or 10 mL) for more severe symptoms.
1 tablet (5 mg desloratadine/120 mg pseudoephedrine) orally once daily
None Documented
None Documented
Terminal half-life 8.5–10.5 hours in children 2–5 years; 9–11 hours in children 6–12 years; 8–9 hours in adults. Clinically, supports once-daily dosing.
Desloratadine: terminal t1/2 27 hours (range 20-50h) supporting once-daily dosing. Pseudoephedrine: t1/2 5-8 hours (up to 16h in alkaline urine).
Primarily renal (60% unchanged) via tubular secretion; 40% metabolized in liver to inactive metabolites excreted in urine; <1% fecal.
Desloratadine: ~87% excreted as metabolites (41% urine, 43% feces), <2% unchanged. Pseudoephedrine: ~70-90% excreted unchanged in urine.
Category C
Category C
Antihistamine
Antihistamine/Decongestant Combination