Comparative Pharmacology
Head-to-head clinical analysis: DISOMER versus PROMETHAZINE HYDROCHLORIDE.
Peer-Reviewed Evidence
Head-to-head clinical analysis: DISOMER versus PROMETHAZINE HYDROCHLORIDE.
DISOMER vs PROMETHAZINE HYDROCHLORIDE
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Selective dopamine D2 receptor antagonist; also blocks alpha-1 adrenergic, histamine H1, and muscarinic M1 receptors.
Promethazine is a phenothiazine derivative that acts as a histamine H1 receptor antagonist, blocking the effects of histamine at H1 receptors. It also has anticholinergic, antiemetic, sedative, and antidopaminergic properties.
Adults: 1 mg orally once daily.
25-50 mg intramuscular or intravenous injection every 4-6 hours as needed; also 12.5-25 mg orally every 4-6 hours.
None Documented
None Documented
12–15 hours in adults with normal renal function; prolonged to 30–40 hours in severe renal impairment (CrCl <30 mL/min).
Terminal elimination half-life is 10-19 hours in adults; prolonged in hepatic impairment (up to 30+ hours) and in elderly.
Renal: 80% as unchanged drug; biliary/fecal: 15% as metabolites; <5% unchanged in feces.
Primarily hepatic metabolism; renal excretion of metabolites accounts for <1% of unchanged drug; biliary/fecal excretion of metabolites ~70-80%.
Category C
Category A/B
Antihistamine
Antihistamine / Antiemetic