Comparative Pharmacology
Head-to-head clinical analysis: DURAGESIC 100 versus ORAMORPH SR.
Peer-Reviewed Evidence
Head-to-head clinical analysis: DURAGESIC 100 versus ORAMORPH SR.
DURAGESIC-100 vs ORAMORPH SR
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Pure opioid agonist that binds to mu-opioid receptors in the CNS, mimicking endogenous endorphins to inhibit pain transmission. Also interacts with kappa and delta receptors. Therapeutic effects include analgesia, sedation, and euphoria.
Morphine is a full opioid agonist with relative selectivity for the mu-opioid receptor, although it can interact with other opioid receptors at higher doses. Binding to mu-opioid receptors in the central nervous system (CNS) and peripheral tissues results in analgesia, euphoria, sedation, respiratory depression, and physical dependence. Morphine also activates descending inhibitory pathways and inhibits ascending nociceptive transmission.
Transdermal patch; initial dose based on prior opioid use: for opioid-naive patients, 12 mcg/h every 72 hours; for opioid-tolerant patients, convert using equianalgesic tables; maximum dose 100 mcg/h per patch; apply to non-irritated, non-irradiated skin on chest, back, flank, or upper arm.
10-30 mg orally every 8-12 hours, sustained-release; titrate as needed for pain.
None Documented
None Documented
Terminal elimination half-life approximately 20–27 hours after transdermal system removal (range 13–25 hours in healthy adults; prolonged in elderly, hepatic impairment, and cachexia).
2–4 hours in adults; in controlled-release formulation, effective half-life is prolonged due to sustained absorption. Clinically, steady-state is achieved in 1–2 days.
Renal (primarily as metabolites, <10% unchanged fentanyl); fecal (about 9% of dose).
Renal (approximately 90% as morphine-3-glucuronide and morphine-6-glucuronide, minor amounts of unchanged morphine, and other conjugates); biliary/fecal (approximately 10%).
Category C
Category C
Opioid Analgesic
Opioid Analgesic