Comparative Pharmacology
Head-to-head clinical analysis: ANEXSIA 7 5 650 versus ULTRACET.
Peer-Reviewed Evidence
Head-to-head clinical analysis: ANEXSIA 7 5 650 versus ULTRACET.
ANEXSIA 7.5/650 vs ULTRACET
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Hydrocodone is a mu-opioid receptor agonist that inhibits ascending pain pathways and alters pain perception; acetaminophen inhibits cyclooxygenase (COX) enzymes, primarily in the CNS, reducing prostaglandin synthesis and fever.
ULTRACET is a combination of tramadol (a centrally acting opioid agonist) and acetaminophen (a centrally acting analgesic with antipyretic effects). Tramadol binds to mu-opioid receptors and inhibits norepinephrine and serotonin reuptake. Acetaminophen's mechanism is not fully understood but involves inhibition of cyclooxygenase (COX) enzymes in the central nervous system.
1 tablet orally every 4 to 6 hours as needed; maximum 6 tablets per day.
1-2 tablets (37.5 mg tramadol/325 mg acetaminophen per tablet) orally every 4-6 hours as needed for pain, not to exceed 8 tablets per day.
None Documented
None Documented
Hydrocodone: Terminal half-life 3.8-7.2 hours (mean 5.6 h). Acetaminophen: 1.5-2.5 hours (therapeutic) but prolonged to >4 hours in overdose with hepatotoxicity risk.
Tramadol: 5.1 ± 0.9 hours (range 4-6 hours) for the parent drug; the active M1 metabolite has a half-life of 6.7 ± 1.7 hours. In hepatic impairment, tramadol half-life increases ~2-3 fold. Acetaminophen: 2-3 hours (range 1.25-3 hours); prolonged in overdose.
Hydrocodone: Renal elimination of metabolites (hydromorphone, norhydrocodone) and unchanged drug accounts for ~60-90% of clearance. Acetaminophen: ~85% of dose is excreted in urine as glucuronide and sulfate conjugates; 5-10% unchanged; 2-5% as mercapturate.
Tramadol and its metabolites are primarily excreted via the kidneys (approximately 90% of the dose), with about 30% excreted as unchanged drug and 60% as metabolites. Approximately 10% is excreted in feces. Acetaminophen is primarily conjugated in the liver and excreted renally as glucuronide (60-80%) and sulfate (20-30%) conjugates, with about 5% excreted unchanged.
Category C
Category C
Opioid Analgesic Combination
Opioid Analgesic Combination