Comparative Pharmacology
Head-to-head clinical analysis: METHADONE HYDROCHLORIDE INTENSOL versus WESTADONE.
Peer-Reviewed Evidence
Head-to-head clinical analysis: METHADONE HYDROCHLORIDE INTENSOL versus WESTADONE.
METHADONE HYDROCHLORIDE INTENSOL vs WESTADONE
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Methadone is a mu-opioid receptor agonist. It also acts as an NMDA receptor antagonist and inhibits serotonin and norepinephrine reuptake. Its long duration of action is due to high protein binding and tissue sequestration.
Mu-opioid receptor agonist; also acts as an NMDA receptor antagonist and inhibits serotonin and norepinephrine reuptake.
Oral: 2.5-10 mg every 8-12 hours; titrate slowly. Typical adult dose: 5-10 mg PO every 8-12 hours.
Oral: 2.5-10 mg every 4-6 hours as needed for pain; maximum 40 mg per day.
None Documented
None Documented
Terminal elimination half-life ranges from 15 to 60 hours (mean ~24-36 hours). The long half-life allows for once-daily dosing in maintenance therapy but risk of accumulation and delayed toxicity during initiation.
Terminal elimination half-life: 15-60 hours (mean ~24 hours). Clinical context: Prolonged half-life supports once-daily dosing in opioid maintenance; accumulation occurs with repeated dosing due to long half-life.
Methadone is primarily eliminated via feces (about 50-60%) and urine (about 20-30%), with approximately 10% as unchanged drug in urine. Biliary excretion contributes to fecal elimination.
Primarily renal (40-50% as unchanged methadone and its metabolites, 15-20% as metadone-N-oxide), biliary/fecal (5-10%).
Category D/X
Category C
Opioid Agonist
Opioid Agonist