Comparative Pharmacology
Head-to-head clinical analysis: DISOPHROL versus HISTAFED.
Peer-Reviewed Evidence
Head-to-head clinical analysis: DISOPHROL versus HISTAFED.
DISOPHROL vs HISTAFED
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Disophrol is a combination of dexbrompheniramine, a first-generation antihistamine that blocks H1 receptors, and pseudoephedrine, a sympathomimetic amine that stimulates alpha-adrenergic receptors causing vasoconstriction.
HISTAFED is a combination of pseudoephedrine, a sympathomimetic amine that acts as a decongestant by stimulating alpha-adrenergic receptors in the nasal mucosa causing vasoconstriction, and triprolidine, a first-generation antihistamine that competes with histamine for H1-receptor sites on effector cells in the gastrointestinal tract, blood vessels, and respiratory tract, thereby preventing histamine-mediated effects.
1 tablet (6 mg dexbrompheniramine maleate / 60 mg pseudoephedrine sulfate) orally every 4-6 hours; not to exceed 4 tablets in 24 hours.
60 mg orally every 4 to 6 hours as needed; maximum 360 mg per day.
None Documented
None Documented
Terminal elimination half-life is 3-4 hours in adults; in renal impairment, half-life may be prolonged up to 8-12 hours requiring dose adjustment.
3-4 hours for pseudoephedrine component; shorter in children (2-3 h), prolonged in renal impairment
Renal excretion of unchanged drug and metabolites; approximately 60-70% of a dose eliminated in urine as unchanged drug and glucuronide conjugates, with <10% in feces.
Renal (approximately 65% as unchanged drug and metabolites), biliary/fecal (35%)
Category C
Category C
Antihistamine/Decongestant Combination
Antihistamine/Decongestant Combination