Comparative Pharmacology
Head-to-head clinical analysis: SUBLIMAZE PRESERVATIVE FREE versus ULTRAM.
Peer-Reviewed Evidence
Head-to-head clinical analysis: SUBLIMAZE PRESERVATIVE FREE versus ULTRAM.
SUBLIMAZE PRESERVATIVE FREE vs ULTRAM
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
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).
Tramadol is a centrally acting synthetic opioid analgesic that binds to μ-opioid receptors and inhibits norepinephrine and serotonin reuptake.
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.
50-100 mg orally every 4-6 hours as needed for pain; maximum 400 mg/day (for extended-release: 100 mg once daily, titrated up to 300 mg once daily).
None Documented
None Documented
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.
Tramadol: ~6 hours; M1 metabolite (O-desmethyltramadol): ~7 hours; prolonged in renal/hepatic impairment
Primarily renal: fentanyl and its metabolites are excreted in urine (~75%) and feces (~9%). Less than 10% excreted unchanged.
Renal: ~90% (tramadol and metabolites; conjugated metabolites are major), Fecal: ~10%
Category C
Category C
Opioid Analgesic
Opioid Analgesic