Comparative Pharmacology
Head-to-head clinical analysis: DEMEROL versus PROPOXYPHENE HYDROCHLORIDE.
Peer-Reviewed Evidence
Head-to-head clinical analysis: DEMEROL versus PROPOXYPHENE HYDROCHLORIDE.
DEMEROL vs PROPOXYPHENE HYDROCHLORIDE
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 hydrochloride is a centrally acting opioid analgesic that binds to mu-opioid receptors in the central nervous system, inhibiting ascending pain pathways and altering perception of and response to pain.
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 per day.
None Documented
None Documented
2.5-4 hours; prolonged in hepatic impairment (7-11 hours) and elderly.
6–12 hours (parent drug); norpropoxyphene metabolite half-life 30–36 hours, accumulates with repeated dosing, increasing risk of toxicity, especially in elderly or renal impairment.
Renal (90% as metabolites and unchanged drug; ~5% unchanged) and biliary/fecal (minor).
Primarily renal (70-90% as unchanged drug and metabolites, including norpropoxyphene); biliary/fecal excretion accounts for less than 10%.
Category C
Category C
Opioid Analgesic
Opioid Analgesic