Comparative Pharmacology
Head-to-head clinical analysis: IMIPRAMINE HYDROCHLORIDE versus PAMELOR.
Peer-Reviewed Evidence
Head-to-head clinical analysis: IMIPRAMINE HYDROCHLORIDE versus PAMELOR.
IMIPRAMINE HYDROCHLORIDE vs PAMELOR
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Tricyclic antidepressant that inhibits the reuptake of norepinephrine and serotonin at presynaptic neuronal membranes, increasing their synaptic concentrations. Also has anticholinergic, antihistaminergic, and alpha-1 adrenergic blocking effects.
Nortriptyline, the active ingredient, is a tricyclic antidepressant that inhibits the reuptake of norepinephrine and serotonin at the presynaptic neuronal membrane, increasing their availability in the synaptic cleft.
Initial 75 mg/day orally in divided doses, increase to 150-200 mg/day; maximum 300 mg/day. For maintenance, 50-150 mg/day orally.
25-150 mg orally per day, typically as a single daily dose at bedtime or in divided doses; start at 25 mg 1-3 times daily and titrate gradually. Maximum 150 mg/day.
None Documented
None Documented
Terminal half-life 11-25 hours (mean ~20 h); clinical context: steady-state achieved in ~1 week, dosing adjustment needed in hepatic impairment
Mean terminal elimination half-life is 18-24 hours (range 13-40 hours) in adults; prolonged in elderly and hepatic impairment (up to 60 hours). Steady-state achieved in 4-5 days.
Renal (70% as metabolites, <5% unchanged), biliary/fecal (30%)
Primarily renal (approximately 70% as metabolites, 40-50% as glucuronide conjugates, 20-30% as free or conjugated nortriptyline; <5% unchanged), with 20-30% biliary/fecal elimination.
Category C
Category C
Tricyclic Antidepressant
Tricyclic Antidepressant