Comparative Pharmacology
Head-to-head clinical analysis: DEMEROL versus TALWIN.
Peer-Reviewed Evidence
Head-to-head clinical analysis: DEMEROL versus TALWIN.
DEMEROL vs TALWIN
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Meperidine is an opioid agonist that binds to mu-opioid receptors in the central nervous system, mimicking endogenous endorphins to produce analgesia, sedation, and euphoria. It also has additional weak actions at kappa and delta receptors.
Agonist at kappa-opioid receptors and antagonist at mu-opioid receptors; produces analgesia through spinal and supraspinal mechanisms.
50-150 mg IM, IV, or SC every 3-4 hours as needed for pain; oral 50-150 mg every 3-4 hours.
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
2.5-4 hours; prolonged in hepatic impairment (7-11 hours) and elderly.
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 (90% as metabolites and unchanged drug; ~5% unchanged) and biliary/fecal (minor).
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