Comparative Pharmacology
Head-to-head clinical analysis: CLARITIN D 24 HOUR versus DIPHENHYDRAMINE HYDROCHLORIDE PRESERVATIVE FREE.
Peer-Reviewed Evidence
Head-to-head clinical analysis: CLARITIN D 24 HOUR versus DIPHENHYDRAMINE HYDROCHLORIDE PRESERVATIVE FREE.
CLARITIN-D 24 HOUR vs DIPHENHYDRAMINE HYDROCHLORIDE PRESERVATIVE FREE
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Loratadine is a long-acting tricyclic antihistamine with selective peripheral H1-receptor antagonism; pseudoephedrine is a sympathomimetic amine that acts as an alpha-adrenergic agonist, causing vasoconstriction in the nasal mucosa.
Competitive antagonist of histamine H1 receptors; centrally acting anticholinergic agent that inhibits acetylcholine muscarinic receptors.
1 tablet (10 mg loratadine/240 mg pseudoephedrine) orally once daily
25 to 50 mg intravenously or intramuscularly every 4 to 6 hours as needed; maximum 400 mg per day.
None Documented
None Documented
Loratadine: 8-11 hours (mean 10.6 ± 4.6 h); desloratadine: 17-24 hours (mean 19.4 ± 7.5 h). Terminal half-life is prolonged in chronic hepatic impairment (mean 37 h for loratadine, 47 h for desloratadine).
Terminal elimination half-life: 4-10 hours (mean ~8 hours); prolonged in hepatic impairment or elderly (up to 20 hours).
Renal (40%) as unchanged drug and metabolites; biliary/fecal (minor). Approximately 27% of loratadine and 40% of desloratadine are excreted in urine over 10 days.
Primarily renal as inactive metabolites; ~60% of a dose appears in urine as metabolites, with <5% unchanged. Minor biliary/fecal elimination (<10%).
Category C
Category A/B
Antihistamine/Decongestant Combination
Antihistamine