Comparative Pharmacology
Head-to-head clinical analysis: DROPERIDOL versus PROMAZINE HYDROCHLORIDE.
Peer-Reviewed Evidence
Head-to-head clinical analysis: DROPERIDOL versus PROMAZINE HYDROCHLORIDE.
DROPERIDOL vs PROMAZINE HYDROCHLORIDE
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Droperidol is a butyrophenone antipsychotic that acts primarily as a dopamine D2 receptor antagonist. It also exhibits antiemetic effects via blockade of dopamine D2 receptors in the chemoreceptor trigger zone. Additionally, it has alpha-adrenergic blocking properties and can prolong the QT interval by blocking cardiac potassium channels (hERG).
Promazine hydrochloride is a phenothiazine antipsychotic that blocks postsynaptic dopamine D2 receptors in the mesolimbic system, as well as histamine H1, alpha-1 adrenergic, and muscarinic cholinergic receptors. It also has moderate serotonin and weak serotonin-dopamine antagonist effects.
2.5-10 mg IV/IM every 3-4 hours as needed for nausea and vomiting; for agitation or psychosis in perioperative settings: 0.625-1.25 mg IV/IM, may repeat every 6 hours.
25-50 mg intramuscularly every 4-6 hours as needed. Maximum 150 mg/day.
None Documented
None Documented
Clinical Note
moderateDroperidol + Norfloxacin
"Droperidol may increase the QTc-prolonging activities of Norfloxacin."
Clinical Note
moderateDroperidol + Ibandronate
"Droperidol may increase the QTc-prolonging activities of Ibandronate."
Clinical Note
moderateDroperidol + Indapamide
"Droperidol may increase the QTc-prolonging activities of Indapamide."
Clinical Note
moderateDroperidol + Methylphenidate
"The risk or severity of adverse effects can be increased when Droperidol is combined with Methylphenidate."
Terminal elimination half-life: 2.3 hours (range 1.5–4.7 hours). Clinical context: Short half-life allows rapid titration but requires repeated dosing or continuous infusion for sustained effect; accumulation with hepatic impairment.
Terminal elimination half-life: 12-18 hours; in elderly or hepatic impairment may extend to 30 hours
Renal (75% as metabolites, <1% unchanged); fecal (22%); biliary excretion contributes to enterohepatic circulation.
Primarily renal (approx. 70-80% as metabolites, <1% unchanged); minor biliary/fecal (approx. 15-20%)
Category A/B
Category C
Antipsychotic
Antipsychotic