Comparative Pharmacology
Head-to-head clinical analysis: OXYCODONE AND ASPIRIN versus WESTADONE.
Peer-Reviewed Evidence
Head-to-head clinical analysis: OXYCODONE AND ASPIRIN versus WESTADONE.
OXYCODONE AND ASPIRIN vs WESTADONE
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Oxycodone: mu-opioid receptor agonist; Aspirin: irreversible cyclooxygenase (COX-1 and COX-2) inhibitor, reducing prostaglandin synthesis.
Mu-opioid receptor agonist; also acts as an NMDA receptor antagonist and inhibits serotonin and norepinephrine reuptake.
1 tablet (oxycodone 4.5 mg/aspirin 325 mg) orally every 6 hours as needed for pain; maximum 4 tablets in 24 hours.
Oral: 2.5-10 mg every 4-6 hours as needed for pain; maximum 40 mg per day.
None Documented
None Documented
Oxycodone: 3-5 hours (immediate-release); 4.5-8 hours (extended-release). Aspirin (salicylate): 2-3 hours (low dose), 15-30 hours (high dose due to saturation of metabolic pathways).
Terminal elimination half-life: 15-60 hours (mean ~24 hours). Clinical context: Prolonged half-life supports once-daily dosing in opioid maintenance; accumulation occurs with repeated dosing due to long half-life.
Oxycodone: renal (primarily as noroxycodone) 87%, fecal <10%. Aspirin (as salicylate): renal 50-80% (dose-dependent; alkaline urine increases excretion), with biliary elimination of metabolites.
Primarily renal (40-50% as unchanged methadone and its metabolites, 15-20% as metadone-N-oxide), biliary/fecal (5-10%).
Category D/X
Category C
Opioid Agonist
Opioid Agonist