Comparative Pharmacology
Head-to-head clinical analysis: DURAGESIC 75 versus PROPOXYPHENE HYDROCHLORIDE 65.
Peer-Reviewed Evidence
Head-to-head clinical analysis: DURAGESIC 75 versus PROPOXYPHENE HYDROCHLORIDE 65.
DURAGESIC-75 vs PROPOXYPHENE HYDROCHLORIDE 65
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Fentanyl is a potent opioid agonist primarily at the mu-opioid receptor, exerting its analgesic effects by mimicking endogenous endorphins and enkephalins to activate G-protein-coupled inwardly rectifying potassium channels, leading to hyperpolarization and reduced neuronal excitability in pain pathways.
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.
Adults: Apply one 75 mcg/hr transdermal patch every 72 hours. Start with lower dose in opioid-naive patients.
65 mg orally every 4 hours as needed for pain; maximum 390 mg/day.
None Documented
None Documented
22-25 hours after removal of patch; increased in elderly, hepatic/renal impairment
6-12 hours (mean ~8 hours); prolonged in hepatic impairment and elderly; accumulation possible with repeated dosing.
Renal (75% as metabolites, <10% unchanged), fecal (25%)
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