Comparative Pharmacology
Head-to-head clinical analysis: DEMEROL versus PROPOXYPHENE HYDROCHLORIDE 65.
Peer-Reviewed Evidence
Head-to-head clinical analysis: DEMEROL versus PROPOXYPHENE HYDROCHLORIDE 65.
DEMEROL vs PROPOXYPHENE HYDROCHLORIDE 65
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Meperidine is an opioid agonist that binds to mu-opioid receptors in the central nervous system, mimicking endogenous endorphins to produce analgesia, sedation, and euphoria. It also has additional weak actions at kappa and delta receptors.
Propoxyphene is a centrally acting opioid agonist that binds to mu-opioid receptors in the central nervous system, inhibiting pain signal transmission and altering pain perception. It also has local anesthetic effects.
50-150 mg IM, IV, or SC every 3-4 hours as needed for pain; oral 50-150 mg every 3-4 hours.
65 mg orally every 4 hours as needed for pain; maximum 390 mg/day.
None Documented
None Documented
2.5-4 hours; prolonged in hepatic impairment (7-11 hours) and elderly.
6-12 hours (mean ~8 hours); prolonged in hepatic impairment and elderly; accumulation possible with repeated dosing.
Renal (90% as metabolites and unchanged drug; ~5% unchanged) and biliary/fecal (minor).
Renal excretion of unchanged drug (approximately 20-30%) and metabolites; approximately 40-60% as conjugated metabolites; minor biliary/fecal elimination.
Category C
Category C
Opioid Analgesic
Opioid Analgesic