Amitriptyline Tapering Guide
amitriptyline
Boxed Warning
Suicidality risk in children, adolescents, and young adults under 25 during initial treatment.
Overview
Amitriptyline is a tertiary amine tricyclic antidepressant (TCA) used for major depressive disorder. It is also widely used off-label for chronic pain, migraine prophylaxis, and insomnia. It has strong anticholinergic, antihistaminic, and alpha-adrenergic blocking properties.
10mg, 25mg, 50mg, 75mg, 100mg
Tablets: 10mg, 25mg, 50mg, 75mg, 100mg, 150mg
Category C (risk cannot be ruled out)
Mechanism of Action
Inhibits reuptake of both serotonin and norepinephrine. Also has significant antagonist activity at histamine H1, muscarinic acetylcholine, and alpha-1 adrenergic receptors, contributing to its sedative, anticholinergic, and hypotensive effects.
Taper Notes
Available in multiple tablet strengths and liquid formulation. Anticholinergic rebound common during withdrawal.
Hyperbolic Tapering Guidance
Multiple available strengths (10, 25, 50, 75mg) allow stepwise reduction. Liquid formulation available for fine adjustments.
Summary written by TaperCommunity, informed by the Maudsley Deprescribing Guidelines (Horowitz & Taylor) and related literature — see Sources & References below. Not affiliated with or endorsed by the Maudsley.
Common Withdrawal Symptoms
Interactions & Safety
Drug Interactions
- MAOIs — contraindicated (hypertensive crisis and serotonin syndrome)
- CYP2D6 inhibitors (fluoxetine, paroxetine, bupropion) significantly increase amitriptyline/nortriptyline levels
- QT-prolonging drugs increase risk of arrhythmia
Food Interactions
- Food does not significantly affect absorption
- Grapefruit juice may increase levels via CYP3A4 inhibition
- Avoid alcohol (additive CNS depression)
Contraindications
- MAOIs within 14 days
- Acute recovery period post-myocardial infarction
- Known hypersensitivity to amitriptyline
Toxicity
Cardiotoxic in overdose (QRS widening, arrhythmias, cardiac arrest). Anticholinergic toxicity (urinary retention, delirium). Seizures. Low therapeutic index.
Pharmacokinetics
ADME Profile
Rapidly absorbed after oral administration. Extensive first-pass metabolism; bioavailability ~30–60%. Tmax 2–5 hours.
~6–10 L/kg
Hepatic via CYP2D6, CYP2C19, CYP1A2, and CYP3A4 to the active metabolite nortriptyline (via demethylation) and hydroxylated metabolites.
Renal (primarily as metabolites). Enterohepatic recirculation contributes to variable half-life.
~96%
~46 L/hr (oral clearance, highly variable)
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Other Drug Profiles
Sources & References
Amitriptyline (amitriptyline) information on this page is sourced from peer-reviewed research, regulatory bodies, clinical guidelines, and patient-advocacy organizations.
Encyclopedic & chemical databases
Neutral, high-authority entity references.
Peer-reviewed research
Primary literature cited in this taper guide.
- Horowitz MA, Taylor D 2019 — Tapering of SSRI treatment to mitigate withdrawal symptoms (hyperbolic taper) (The Lancet Psychiatry)
- Davies J, Read J 2019 — A systematic review into the incidence, severity and duration of antidepressant withdrawal effects (Addictive Behaviors)
- Framer A 2021 — The patient voice: an exploration of the experience of withdrawal from antidepressants (Therapeutic Advances in Psychopharmacology)
Clinical guidelines
Evidence-based deprescribing and prescribing standards.
Deprescribing-specific resources
Clinician-facing references on tapering protocols.
- Deprescribing.org — Evidence-based deprescribing algorithms from the Bruyère Research Institute
- Royal College of Psychiatrists — Stopping antidepressants — UK clinical guidance on safely discontinuing antidepressants
Patient-advocacy & lived-experience
Long-running communities documenting withdrawal experience.
- Surviving Antidepressants — tapering forum — Long-running community archive of antidepressant taper experiences
- Inner Compass Initiative — Withdrawal Project — Peer-led resources for psychiatric drug withdrawal
- Mad in America — antidepressant withdrawal archive — Journalism and personal narratives on SSRI/SNRI discontinuation
- RxISK — adverse drug reaction reporting — Independent database of patient-reported adverse effects
TaperCommunity does not provide medical advice. Always consult a qualified prescriber before adjusting psychiatric medication.