Comparative Pharmacology
Head-to-head clinical analysis: DESLORATADINE versus ZYRTEC D 12 HOUR.
Peer-Reviewed Evidence
Head-to-head clinical analysis: DESLORATADINE versus ZYRTEC D 12 HOUR.
DESLORATADINE vs ZYRTEC-D 12 HOUR
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Desloratadine is a long-acting tricyclic histamine antagonist selective for the H1 receptor, inhibiting histamine release from mast cells and basophils. It reduces allergic inflammation by decreasing cytokine and chemokine release.
Cetirizine is a second-generation antihistamine that selectively inhibits peripheral H1 receptors, reducing histamine-mediated allergic responses. Pseudoephedrine is a sympathomimetic amine that acts as a decongestant via alpha-adrenergic receptor agonism in the respiratory tract mucosa, causing vasoconstriction and reduced edema.
5 mg orally once daily.
1 tablet (5 mg cetirizine / 120 mg pseudoephedrine) orally every 12 hours. Maximum 2 tablets per 24 hours.
None Documented
None Documented
Clinical Note
moderateDesloratadine + Venlafaxine
"The risk or severity of adverse effects can be increased when Desloratadine is combined with Venlafaxine."
Clinical Note
moderateDesloratadine + Nefazodone
"The risk or severity of adverse effects can be increased when Desloratadine is combined with Nefazodone."
Clinical Note
moderateDesloratadine + Stiripentol
"The risk or severity of adverse effects can be increased when Desloratadine is combined with Stiripentol."
Clinical Note
moderateTerminal half-life 27 hours (range 21–30 h) in healthy adults; supports once-daily dosing.
Cetirizine: 8-10 hours in healthy adults; increased in renal impairment (e.g., up to 30 hours in severe impairment). Pseudoephedrine: 5-8 hours (pH-dependent; longer in alkaline urine).
Primarily renal (87% as metabolites, ~41% unchanged) and fecal (~9%). Metabolized to active 3-hydroxydesloratadine.
Cetirizine: 70% renal (unchanged), 10% fecal. Pseudoephedrine: 90% renal (unchanged), remainder metabolized and excreted in urine.
Category A/B
Category C
Antihistamine
Antihistamine and Decongestant Combination
Desloratadine + Fesoterodine
"The serum concentration of the active metabolites of Fesoterodine can be increased when Fesoterodine is used in combination with Desloratadine."