Comparative Pharmacology
Head-to-head clinical analysis: DARVON COMPOUND 65 versus PROPOXYPHENE COMPOUND 65.
Peer-Reviewed Evidence
Head-to-head clinical analysis: DARVON COMPOUND 65 versus PROPOXYPHENE COMPOUND 65.
DARVON COMPOUND-65 vs PROPOXYPHENE COMPOUND 65
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
DARVON COMPOUND-65 contains propoxyphene, a centrally acting opioid agonist with analgesic effects primarily mediated through mu-opioid receptors. Aspirin inhibits cyclooxygenase (COX) enzymes, reducing prostaglandin synthesis. Caffeine is a CNS stimulant with additive analgesic effects.
Propoxyphene is an opioid analgesic that binds to mu-opioid receptors in the central nervous system, resulting in inhibition of ascending pain pathways and alteration of pain perception. Acetaminophen component inhibits cyclooxygenase (COX) enzymes, reducing prostaglandin synthesis.
1 capsule (propoxyphene HCl 65 mg, aspirin 389 mg, caffeine 32.4 mg) orally every 4 hours as needed for pain; maximum 6 capsules per day.
Adults: 1 capsule (65 mg propoxyphene HCl + 650 mg acetaminophen) orally every 4 hours as needed; maximum 6 capsules per day.
None Documented
None Documented
Propoxyphene: 6-12 hours (mean 8 h); nordextropropoxyphene: 22-30 hours (accumulates with repeated dosing; risk of toxicity)
The terminal elimination half-life of propoxyphene is approximately 8-24 hours (mean 12 hours) in healthy adults. The half-life of its active metabolite, norpropoxyphene, is 30-36 hours, leading to prolonged effects and potential accumulation with repeated dosing, especially in renal impairment.
Renal: ~90% as propoxyphene and metabolites (nordextropropoxyphene); biliary/fecal: ~10%
Renal excretion of propoxyphene and its metabolites accounts for approximately 70-90% of an administered dose, with less than 5% excreted as unchanged drug. The remainder is eliminated via bile and feces. Minor amounts are excreted in breast milk.
Category C
Category C
Opioid Analgesic Combination
Opioid Analgesic Combination