Comparative Pharmacology
Head-to-head clinical analysis: LEVORPHANOL TARTRATE versus SUBLIMAZE PRESERVATIVE FREE.
Peer-Reviewed Evidence
Head-to-head clinical analysis: LEVORPHANOL TARTRATE versus SUBLIMAZE PRESERVATIVE FREE.
LEVORPHANOL TARTRATE vs SUBLIMAZE PRESERVATIVE FREE
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Levorphanol is a potent opioid analgesic that acts as a mu-opioid receptor agonist. It also has NMDA receptor antagonist activity, inhibits norepinephrine and serotonin reuptake, and acts as a sigma receptor agonist, contributing to its analgesic effects and reduced tolerance development.
Fentanyl is a potent synthetic opioid agonist with primary action at the mu-opioid receptor. It induces analgesia, sedation, and respiratory depression by activating G-protein-coupled receptors that inhibit adenylyl cyclase, reduce cAMP production, and modulate ion channels (e.g., potassium efflux, calcium influx).
2 mg orally every 6-8 hours as needed for pain; for opioid-tolerant patients, doses up to 4 mg orally every 6-8 hours may be used. Parenterally: 1-2 mg subcutaneously or intramuscularly every 6-8 hours; may be given intravenously at 0.5-1 mg every 6-8 hours.
IV: 0.5-2 mcg/kg bolus, may repeat q2-4h; or 0.5-1 mcg/kg/h infusion; IM: 0.5-2 mcg/kg q1-2h prn.
None Documented
None Documented
11-16 hours; extended in hepatic impairment (up to 30 hours).
Terminal elimination half-life is 3-7 hours (mean 4.5 h) after IV administration, but may be prolonged (up to 12-15 h) in elderly, hepatic impairment, or after prolonged infusion due to redistribution.
Renal: approximately 30% as unchanged drug and 50% as glucuronide conjugates; fecal: 20% via biliary excretion.
Primarily renal: fentanyl and its metabolites are excreted in urine (~75%) and feces (~9%). Less than 10% excreted unchanged.
Category C
Category C
Opioid Analgesic
Opioid Analgesic