Comparative Pharmacology
Head-to-head clinical analysis: DISOPHROL versus PHENYLEPHRINE HYDROCHLORIDE AND PROMETHAZINE HYDROCHLORIDE.
Peer-Reviewed Evidence
Head-to-head clinical analysis: DISOPHROL versus PHENYLEPHRINE HYDROCHLORIDE AND PROMETHAZINE HYDROCHLORIDE.
DISOPHROL vs PHENYLEPHRINE HYDROCHLORIDE AND PROMETHAZINE HYDROCHLORIDE
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.
Phenylephrine is a selective alpha-1 adrenergic receptor agonist causing vasoconstriction; promethazine is a phenothiazine derivative that blocks histamine H1 receptors and has anticholinergic, antiemetic, and sedative effects.
1 tablet (6 mg dexbrompheniramine maleate / 60 mg pseudoephedrine sulfate) orally every 4-6 hours; not to exceed 4 tablets in 24 hours.
IV: 0.1-0.5 mg phenylephrine and 12.5-25 mg promethazine as a single dose.
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.
Phenylephrine: 2-3 hours (terminal). Promethazine: 10-14 hours (terminal in adults; prolonged in elderly and hepatic 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.
Phenylephrine: renal (80% as unchanged drug and sulfate conjugates). Promethazine: renal (70-80% as metabolites and unchanged drug), fecal (20-30%).
Category C
Category A/B
Antihistamine/Decongestant Combination
Antihistamine / Antiemetic