Comparative Pharmacology
Head-to-head clinical analysis: DURAGESIC 25 versus TALWIN.
Peer-Reviewed Evidence
Head-to-head clinical analysis: DURAGESIC 25 versus TALWIN.
DURAGESIC-25 vs TALWIN
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Fentanyl is a mu-opioid receptor agonist that produces analgesia and sedation by mimicking endogenous opioids in the central nervous system.
Agonist at kappa-opioid receptors and antagonist at mu-opioid receptors; produces analgesia through spinal and supraspinal mechanisms.
Apply 25 mcg/hour transdermally every 72 hours; initial dose in opioid-naive patients: 25 mcg/hour is not recommended; use lower strength or immediate-release opioid first.
50 mg orally every 3-4 hours as needed; maximum 600 mg/day. For severe pain, 30 mg intramuscularly or subcutaneously every 3-4 hours; maximum 360 mg/day parenterally.
None Documented
None Documented
Terminal elimination half-life 22-25 hours (range 13-31 h) after 72-h transdermal application; prolonged in elderly, hepatic or renal impairment
2-3 hours in adults; prolonged to 4-6 hours in hepatic impairment; clinical context: short half-life necessitates frequent dosing for chronic pain
Renal (75% as metabolites, <10% unchanged); fecal (9%)
Renal: 60-70% as unchanged drug and metabolites (pentazocine and its glucuronide conjugate); biliary/fecal: 20-30%
Category C
Category C
Opioid Analgesic
Opioid Analgesic