Comparative Pharmacology
Head-to-head clinical analysis: QDOLO versus TYLENOL W CODEINE NO 2.
Peer-Reviewed Evidence
Head-to-head clinical analysis: QDOLO versus TYLENOL W CODEINE NO 2.
QDOLO vs TYLENOL W/ CODEINE NO. 2
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Tramadol is a centrally acting synthetic opioid analgesic. It binds to μ-opioid receptors and inhibits norepinephrine and serotonin reuptake.
Acetaminophen: Inhibits cyclooxygenase (COX) in the CNS, reducing prostaglandin synthesis, with weak peripheral COX inhibition. Codeine: Prodrug converted to morphine via CYP2D6; morphine acts as a mu-opioid receptor agonist, inhibiting ascending pain pathways and altering pain perception.
Oral: 50-100 mg every 4-6 hours as needed for pain; maximum 400 mg per day. Immediate-release tablets only. Extended-release formulations require different dosing and are not interchangeable.
1 to 2 tablets (300 mg acetaminophen/15 mg codeine phosphate per tablet) orally every 4 hours as needed for pain; maximum 12 tablets per day.
None Documented
None Documented
Terminal elimination half-life approximately 2-4 hours in adults; prolonged to 4-6 hours in elderly and up to 12-16 hours in severe renal impairment (CrCl <30 mL/min)
Acetaminophen: 2-3 hours. Codeine: 2.5-3.5 hours. In hepatic impairment, half-life of codeine may be prolonged.
Renal 90% (60% unchanged, 30% as glucuronide conjugate), fecal 10%
Renal: 70-80% as glucuronide and sulfate conjugates of acetaminophen, 5-10% as unchanged acetaminophen, and 5-10% as unchanged codeine. Biliary/fecal: minor, <5%.
Category C
Category D/X
Opioid Agonist
Opioid Agonist