Comparative Pharmacology
Head-to-head clinical analysis: CLARITIN D versus DIPHENHYDRAMINE HYDROCHLORIDE PRESERVATIVE FREE.
Peer-Reviewed Evidence
Head-to-head clinical analysis: CLARITIN D versus DIPHENHYDRAMINE HYDROCHLORIDE PRESERVATIVE FREE.
CLARITIN-D 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 a decongestant by stimulating alpha-adrenergic receptors in the respiratory tract mucosa, causing vasoconstriction.
Competitive antagonist of histamine H1 receptors; centrally acting anticholinergic agent that inhibits acetylcholine muscarinic receptors.
One tablet (5 mg loratadine/120 mg pseudoephedrine sulfate) orally every 12 hours; do not exceed 2 tablets in 24 hours.
25 to 50 mg intravenously or intramuscularly every 4 to 6 hours as needed; maximum 400 mg per day.
None Documented
None Documented
Loratadine: 8-14 h (mean 11 h); desloratadine: 17-24 h (mean 21 h). Pseudoephedrine: 4-8 h (mean 6 h), prolonged in alkaline urine.
Terminal elimination half-life: 4-10 hours (mean ~8 hours); prolonged in hepatic impairment or elderly (up to 20 hours).
Loratadine: 40% renal (metabolites), ~40% fecal; desloratadine: 33% renal, 66% fecal. Pseudoephedrine: 70-90% renal unchanged, 1-2% biliary.
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