Comparative Pharmacology
Head-to-head clinical analysis: COMBUNOX versus COMPOUND 65.
Peer-Reviewed Evidence
Head-to-head clinical analysis: COMBUNOX versus COMPOUND 65.
COMBUNOX vs COMPOUND 65
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
COMBUNOX is a fixed-dose combination of oxycodone, a full mu-opioid receptor agonist, and ibuprofen, a nonsteroidal anti-inflammatory drug (NSAID) that inhibits cyclooxygenase (COX-1 and COX-2), thereby reducing prostaglandin synthesis.
COMPOUND 65 acts as a selective serotonin reuptake inhibitor (SSRI), increasing serotonin levels in the synaptic cleft by blocking the serotonin transporter (SERT).
1 tablet (ibuprofen 400 mg/oxycodone HCl 10 mg) orally every 4 to 6 hours as needed for pain; maximum 4 tablets per day.
25 mg orally every 8 hours as needed for pain; maximum 75 mg per day.
None Documented
None Documented
Oxycodone terminal half-life is 3.5-5.5 hours (mean ~3.8 hours) in immediate-release form; controlled-release formulations have a prolonged absorption phase with an effective half-life of 4.5-8 hours. Ibuprofen terminal half-life is 1.8-2.5 hours (mean ~2 hours). Clinical context: Oxycodone's half-life supports dosing every 4-6 hours (IR) or 12 hours (CR); ibuprofen's short half-life requires frequent dosing for sustained anti-inflammatory effect. In elderly or hepatic impairment, oxycodone half-life may increase to 6-8 hours; ibuprofen half-life may be slightly prolonged.
Terminal elimination half-life is 8-12 hours in healthy adults; prolonged to 15-20 hours in hepatic impairment; requires dose adjustment in severe hepatic disease.
Oxycodone is primarily metabolized in the liver; metabolites are excreted mainly in urine. Approximately 87% of an oral dose is eliminated within 24 hours: 60-70% as oxycodone metabolites (mostly noroxycodone and oxymorphone conjugates) and 10-15% as unchanged oxycodone. Ibuprofen is rapidly metabolized and excreted; about 90% of a dose is eliminated in urine as metabolites (primarily hydroxylated and carboxylated forms) and <1% as unchanged drug. Biliary/fecal elimination accounts for <10% of each component.
Renal excretion of unchanged drug accounts for 30-40%; hepatic metabolism with fecal elimination of metabolites accounts for 50-60%; biliary excretion is minimal (<5%).
Category C
Category C
Analgesic Combination (Opioid + NSAID)
Analgesic Combination (Opioid + NSAID)