Comparative Pharmacology
Head-to-head clinical analysis: DURAGESIC 75 versus STADOL PRESERVATIVE FREE.
Peer-Reviewed Evidence
Head-to-head clinical analysis: DURAGESIC 75 versus STADOL PRESERVATIVE FREE.
DURAGESIC-75 vs STADOL PRESERVATIVE FREE
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Fentanyl is a potent opioid agonist primarily at the mu-opioid receptor, exerting its analgesic effects by mimicking endogenous endorphins and enkephalins to activate G-protein-coupled inwardly rectifying potassium channels, leading to hyperpolarization and reduced neuronal excitability in pain pathways.
Butorphanol is a synthetic agonist-antagonist opioid analgesic that exerts its effects primarily through binding to kappa-opioid receptors and, to a lesser extent, mu-opioid receptors, producing analgesia and sedation. It also has partial antagonist activity at mu receptors.
Adults: Apply one 75 mcg/hr transdermal patch every 72 hours. Start with lower dose in opioid-naive patients.
0.5–2 mg intravenously or intramuscularly every 3–4 hours as needed for pain. Alternatively, 1–2 mg as a single dose, may repeat in 30–60 minutes if needed.
None Documented
None Documented
22-25 hours after removal of patch; increased in elderly, hepatic/renal impairment
Terminal elimination half-life is 2.5–3.3 hours in adults; prolonged to 4–6 hours in elderly or hepatic impairment.
Renal (75% as metabolites, <10% unchanged), fecal (25%)
Primarily hepatic metabolism (glucuronidation) to inactive metabolites; renal excretion accounts for <5% unchanged drug. Approximately 70% of dose excreted in urine as metabolites, 20% in feces.
Category C
Category C
Opioid Analgesic
Opioid Analgesic