Comparative Pharmacology
Head-to-head clinical analysis: MAXOLON versus PROMETHAZINE HYDROCHLORIDE CODEINE PHOSPHATE.
Peer-Reviewed Evidence
Head-to-head clinical analysis: MAXOLON versus PROMETHAZINE HYDROCHLORIDE CODEINE PHOSPHATE.
MAXOLON vs PROMETHAZINE HYDROCHLORIDE; CODEINE PHOSPHATE
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Metoclopramide, the active ingredient in MAXOLON, is a dopamine D2 receptor antagonist and also enhances the response to acetylcholine at muscarinic receptors in the gastrointestinal tract, leading to increased gastric motility and accelerated gastric emptying. It also has antiemetic effects by blocking dopamine receptors in the chemoreceptor trigger zone (CTZ).
Promethazine is a phenothiazine derivative that acts as a histamine H1 receptor antagonist, antiemetic, and sedative via blockade of central and peripheral H1 receptors and antagonism of dopamine D2 receptors. Codeine is an opioid agonist that binds to mu-opioid receptors in the CNS, producing analgesia and cough suppression; it also has antitussive effects via central action.
10 mg orally, intramuscularly, or intravenously three to four times daily. Maximum daily dose: 30 mg or 0.5 mg/kg.
Promethazine hydrochloride 6.25-25 mg / codeine phosphate 10-20 mg (based on codeine component) orally every 4-6 hours as needed. Maximum codeine dose: 60 mg per dose, 120 mg per day.
None Documented
None Documented
5-6 hours in adults with normal renal function; prolonged to 15-20 hours in severe renal impairment (CrCl <10 mL/min).
Promethazine: 10-19 hours (terminal); Codeine: 2.4-4 hours (terminal), prolonged in hepatic impairment. Clinical context: Dosing interval typically 4-6 hours for codeine; promethazine accumulates with repeated dosing.
Renal: 85-95% as unchanged drug and metabolites; biliary/fecal: <5%.
Promethazine: Renal (70-80% as metabolites, <1% unchanged); Codeine: Renal (70-90% as metabolites, 5-15% unchanged). Biliary/feces: Minor (<10% total).
Category C
Category A/B
Antiemetic
Antihistamine / Antiemetic