Comparative Pharmacology
Head-to-head clinical analysis: CLARINEX D 24 HOUR versus X TROZINE L A.
Peer-Reviewed Evidence
Head-to-head clinical analysis: CLARINEX D 24 HOUR versus X TROZINE L A.
CLARINEX D 24 HOUR vs X-TROZINE L.A.
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
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.
X-TROZINE L.A. is a piperazine derivative that acts as a centrally acting alpha-2 adrenergic agonist, reducing sympathetic outflow from the brainstem, leading to decreased peripheral vascular resistance and lowered blood pressure.
1 tablet (5 mg desloratadine/120 mg pseudoephedrine) orally once daily
250 mg orally once daily. May be increased to 500 mg once daily if needed.
None Documented
None Documented
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).
12-15 hours; prolonged in renal impairment (up to 30 hours in CrCl <30 mL/min).
Desloratadine: ~87% excreted as metabolites (41% urine, 43% feces), <2% unchanged. Pseudoephedrine: ~70-90% excreted unchanged in urine.
Primarily renal (70-80% as unchanged drug), with 20-30% fecal via biliary excretion.
Category C
Category C
Antihistamine/Decongestant Combination
Antihistamine