Comparative Pharmacology
Head-to-head clinical analysis: CETIRIZINE versus PROMETHAZINE DM.
Peer-Reviewed Evidence
Head-to-head clinical analysis: CETIRIZINE versus PROMETHAZINE DM.
Cetirizine vs PROMETHAZINE DM
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Cetirizine is a selective second-generation H1-receptor antagonist that inhibits histamine release from mast cells and basophils, thereby reducing allergic symptoms.
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.
10 mg orally once daily; 5 mg orally once daily for mild symptoms
2 teaspoonfuls (10 mL) orally every 4-6 hours, not to exceed 8 teaspoonfuls (40 mL) per 24 hours.
None Documented
None Documented
Clinical Note
moderateCetirizine + Fluticasone propionate
"The risk or severity of adverse effects can be increased when Cetirizine is combined with Fluticasone propionate."
Clinical Note
moderateLevocetirizine + Sulfisoxazole
"The metabolism of Sulfisoxazole can be decreased when combined with Levocetirizine."
Clinical Note
moderateLevocetirizine + Erythromycin
"The metabolism of Erythromycin can be decreased when combined with Levocetirizine."
Clinical Note
moderateLevocetirizine + Cyclosporine
Terminal elimination half-life is approximately 8.3 hours in healthy adults; extended to 20 hours in elderly and patients with renal impairment
16-19 hours (terminal); note: effect may last longer due to active metabolites and tissue binding
Primarily renal (60% unchanged in urine); minor biliary/fecal (10%)
Renal (70-80% as metabolites, <1% unchanged); biliary/fecal (20-30%)
Category A/B
Category A/B
Antihistamine
Antihistamine / Antiemetic
"The metabolism of Cyclosporine can be decreased when combined with Levocetirizine."