Comparative Pharmacology
Head-to-head clinical analysis: HYDROXYZINE versus PHENYLEPHRINE HYDROCHLORIDE AND PROMETHAZINE HYDROCHLORIDE.
Peer-Reviewed Evidence
Head-to-head clinical analysis: HYDROXYZINE versus PHENYLEPHRINE HYDROCHLORIDE AND PROMETHAZINE HYDROCHLORIDE.
HYDROXYZINE vs PHENYLEPHRINE HYDROCHLORIDE AND PROMETHAZINE HYDROCHLORIDE
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Hydroxyzine is a first-generation antihistamine that acts as a competitive antagonist at histamine H1 receptors in the gastrointestinal tract, blood vessels, and respiratory tract. It also exhibits sedative, anxiolytic, and antiemetic properties, possibly through central nervous system depression and anticholinergic effects.
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.
25-100 mg orally 3-4 times daily; 50-100 mg IM every 4-6 hours as needed. Maximum oral dose: 600 mg/day in divided doses.
IV: 0.1-0.5 mg phenylephrine and 12.5-25 mg promethazine as a single dose.
None Documented
None Documented
Clinical Note
moderateHydroxyzine + Venlafaxine
"The risk or severity of adverse effects can be increased when Hydroxyzine is combined with Venlafaxine."
Clinical Note
moderateHydroxyzine + Nefazodone
"The risk or severity of adverse effects can be increased when Hydroxyzine is combined with Nefazodone."
Clinical Note
moderateHydroxyzine + Mifepristone
"Hydroxyzine may increase the QTc-prolonging activities of Mifepristone."
Clinical Note
moderateHydroxyzine + Fesoterodine
Terminal elimination half-life: 14-25 hours (mean ~20 h). In elderly or hepatic impairment, may be prolonged; antihistamine effect persists beyond half-life due to active metabolite.
Phenylephrine: 2-3 hours (terminal). Promethazine: 10-14 hours (terminal in adults; prolonged in elderly and hepatic impairment).
Renal: approximately 70% as metabolites, less than 1% unchanged. Fecal/biliary: minor. Cetirizine (active metabolite) also renally eliminated.
Phenylephrine: renal (80% as unchanged drug and sulfate conjugates). Promethazine: renal (70-80% as metabolites and unchanged drug), fecal (20-30%).
Category A/B
Category A/B
Antihistamine
Antihistamine / Antiemetic
"The serum concentration of the active metabolites of Fesoterodine can be increased when Fesoterodine is used in combination with Hydroxyzine."