Comparative Pharmacology
Head-to-head clinical analysis: AMITRIL versus AVENTYL.
Peer-Reviewed Evidence
Head-to-head clinical analysis: AMITRIL versus AVENTYL.
AMITRIL vs AVENTYL
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Amitriptyline inhibits the reuptake of serotonin and norepinephrine, thereby increasing their synaptic concentrations. It also blocks histamine H1, alpha-1 adrenergic, and muscarinic receptors.
Nortriptyline, the active ingredient, inhibits the reuptake of norepinephrine and serotonin in the central nervous system, potentiating their effects. It also has anticholinergic and antihistaminergic properties.
Adults: Initial 25 mg PO once daily at bedtime, increase by 25 mg every 3-7 days as tolerated to typical maintenance 75-150 mg/day PO divided doses or single dose at bedtime. Maximum 300 mg/day.
Adults: 25 mg orally 3 to 4 times daily, maximum 150 mg/day.
None Documented
None Documented
Terminal elimination half-life: 15–25 hours (mean 20 h); may extend to >40 h in elderly or hepatic impairment.
Terminal elimination half-life: 19-24 hours; requires 4-6 days to reach steady state.
Renal: ~70% as metabolites, <5% unchanged; fecal: ~30% via bile.
Renal (30% as unchanged drug and metabolites); biliary/fecal (70% as metabolites)
Category C
Category C
Tricyclic Antidepressant
Tricyclic Antidepressant