Comparative Pharmacology
Head-to-head clinical analysis: CLARITIN D 24 HOUR versus PROMETHAZINE DM.
Peer-Reviewed Evidence
Head-to-head clinical analysis: CLARITIN D 24 HOUR versus PROMETHAZINE DM.
CLARITIN-D 24 HOUR vs PROMETHAZINE DM
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.
Promethazine is a phenothiazine derivative that acts as a histamine H1 receptor antagonist, antiemetic via blockade of dopamine D2 receptors in the chemoreceptor trigger zone, and sedative via central anticholinergic effects. Dextromethorphan is an NMDA receptor antagonist and sigma-1 receptor agonist, suppressing cough by central action on the cough center.
1 tablet (10 mg loratadine/240 mg pseudoephedrine) orally once daily
2 teaspoonfuls (10 mL) orally every 4-6 hours, not to exceed 8 teaspoonfuls (40 mL) per 24 hours.
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).
16-19 hours (terminal); note: effect may last longer due to active metabolites and tissue binding
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.
Renal (70-80% as metabolites, <1% unchanged); biliary/fecal (20-30%)
Category C
Category A/B
Antihistamine/Decongestant Combination
Antihistamine / Antiemetic