Comparative Pharmacology
Head-to-head clinical analysis: CLARINEX D 24 HOUR versus PROMETHACON.
Peer-Reviewed Evidence
Head-to-head clinical analysis: CLARINEX D 24 HOUR versus PROMETHACON.
CLARINEX D 24 HOUR vs PROMETHACON
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.
Promethazine is a phenothiazine derivative with antihistaminic (H1 receptor antagonist), antiemetic, sedative, and anticholinergic properties. It inhibits central and peripheral H1 receptors, blocks dopamine D2 receptors in the chemoreceptor trigger zone, and has weak alpha-adrenergic blockade.
1 tablet (5 mg desloratadine/120 mg pseudoephedrine) orally once daily
25-50 mg intramuscularly or intravenously every 4-6 hours as needed. Maximum intravenous rate: 25 mg/minute. Maximum daily dose: 150 mg.
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).
Terminal elimination half-life: 4-6 hours in healthy adults; prolonged to 10-14 hours in hepatic impairment
Desloratadine: ~87% excreted as metabolites (41% urine, 43% feces), <2% unchanged. Pseudoephedrine: ~70-90% excreted unchanged in urine.
Renal (80%) as inactive metabolites, 20% fecal via bile
Category C
Category C
Antihistamine/Decongestant Combination
Antihistamine