Comparative Pharmacology
Head-to-head clinical analysis: BENYLIN versus CETIRIZINE.
Peer-Reviewed Evidence
Head-to-head clinical analysis: BENYLIN versus CETIRIZINE.
BENYLIN vs Cetirizine
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
BENYLIN (diphenhydramine) is a first-generation antihistamine that competitively antagonizes histamine at H1 receptors, thereby alleviating allergic symptoms. It also crosses the blood-brain barrier and acts as a central nervous system depressant via inhibition of histamine and acetylcholine, producing sedative, antiemetic, and antitussive effects.
Cetirizine is a selective second-generation H1-receptor antagonist that inhibits histamine release from mast cells and basophils, thereby reducing allergic symptoms.
Oral: 10-20 mL (25-50 mg diphenhydramine) every 4-6 hours; maximum 100 mg per day.
10 mg orally once daily; 5 mg orally once daily for mild symptoms
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: 4-6 hours in adults; extended to 10-12 hours in hepatic impairment, increasing risk of accumulation.
Terminal elimination half-life is approximately 8.3 hours in healthy adults; extended to 20 hours in elderly and patients with renal impairment
Renal: ~80% as unchanged drug and glucuronide conjugates; fecal/biliary: ~20%.
Primarily renal (60% unchanged in urine); minor biliary/fecal (10%)
Category C
Category A/B
Antihistamine
Antihistamine
"The metabolism of Cyclosporine can be decreased when combined with Levocetirizine."