Comparative Pharmacology
Head-to-head clinical analysis: NEOTRIZINE versus PROMETHAZINE W CODEINE.
Peer-Reviewed Evidence
Head-to-head clinical analysis: NEOTRIZINE versus PROMETHAZINE W CODEINE.
NEOTRIZINE vs PROMETHAZINE W/ CODEINE
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Neotrizine contains sulfadiazine, a competitive inhibitor of dihydropteroate synthase, blocking folic acid synthesis in susceptible bacteria.
Codeine is a prodrug converted to morphine, a mu-opioid receptor agonist, which inhibits nociceptive transmission; promethazine is a phenothiazine derivative with H1-receptor antagonism, anticholinergic, and antiemetic effects.
NEOTRIZINE (sulfamethoxazole/trimethoprim) 800 mg/160 mg orally every 12 hours for 5-14 days, depending on indication.
10 mL (1 mg codeine, 6.25 mg promethazine per 5 mL) orally every 4-6 hours as needed for cough. Maximum: 60 mL per day. Do not exceed 5 days.
None Documented
None Documented
Terminal elimination half-life is 4-6 hours in adults with normal renal function; in renal impairment, half-life may extend to 12-18 hours requiring dose adjustment.
Promethazine: 10-19 hours (terminal). Codeine: 2.5-3.5 hours (terminal); prolonged in renal impairment.
Renal excretion of unchanged drug accounts for 60-70% of elimination; biliary/fecal elimination accounts for 20-30%, with the remainder as metabolites.
Promethazine: renal (70% as metabolites, <1% unchanged), fecal (20-30%). Codeine: renal (90%, of which 5-10% unchanged, rest as metabolites), fecal (minor).
Category C
Category A/B
Antihistamine
Antihistamine / Antiemetic