Comparative Pharmacology
Head-to-head clinical analysis: BENADRYL versus FEXOFENADINE HYDROCHLORIDE ALLERGY.
Peer-Reviewed Evidence
Head-to-head clinical analysis: BENADRYL versus FEXOFENADINE HYDROCHLORIDE ALLERGY.
BENADRYL vs FEXOFENADINE HYDROCHLORIDE ALLERGY
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Antihistamine; inverse agonist at histamine H1 receptors, blocking histamine-induced vasodilation, increased capillary permeability, and bronchoconstriction; also anticholinergic and sedative.
Fexofenadine is a selective peripheral H1-receptor antagonist that inhibits histamine release from mast cells and basophils.
25-50 mg orally every 4-6 hours as needed; maximum 300 mg per day. Alternatively, 10-50 mg intramuscularly or intravenously once, maximum 100 mg per dose (IV route preferred).
60 mg orally twice daily or 180 mg orally once daily.
None Documented
None Documented
Terminal elimination half-life 4-8 hours; prolonged in hepatic impairment (up to 20 hours).
Terminal elimination half-life is 14.4 hours in healthy adults. In renal impairment, half-life may be prolonged up to 59 hours.
Renal (90% as metabolites, <5% unchanged); minimal biliary/fecal.
Primarily excreted unchanged in feces (80%) and urine (11%). Biliary excretion contributes to fecal elimination.
Category C
Category A/B
Antihistamine
Antihistamine