Prescription ·Strong evidence ·Reviewed May 2026
Prescription tricyclic antidepressant (TCA) originally approved for major depressive disorder but now more commonly used for chronic neuropathic pain, migraine prophylaxis, and fibromyalgia due to its analgesic properties. Carries significant anticholinergic and cardiac risks at higher doses. Lethal in overdose, which limits its use as a first-line antidepressant. Dosage must be determined by your prescribing physician.
The bottom line
Evidence rating strong. Most-documented uses: neuropathic pain relief, migraine prophylaxis, depression symptom relief. 10 sources indexed (2008–2025), with 3 interaction records on file.
Core mechanism
Inhibits the reuptake of serotonin and norepinephrine by blocking SERT and NET. Also antagonizes histamine H1 receptors (sedation), muscarinic acetylcholine receptors (anticholinergic effects), and alpha-1 adrenergic receptors (orthostatic hypotension). Blocks sodium channels at cardiac tissue, contributing to cardiotoxicity in overdose.
Can be taken with or without food. Typically administered at bedtime due to sedating effects. Highly lipophilic with large volume of distribution.7
Nutrients this medication can lower over time, and what to replace.
Antidepressant-associated SIADH can increase renal free-water retention and dilute serum sodium, producing hyponatremia.
Combining an SSRI with a tricyclic antidepressant increases the risk of serotonin syndrome and may elevate TCA blood levels due to CYP2D6 inhibition, increasing the risk of TCA toxicity including cardiac arrhythmias.
Recommendation: Generally avoid this combination. If clinically necessary, use reduced TCA doses with serum TCA level monitoring and ECG surveillance.
St. John's Wort can substantially lower amitriptyline and nortriptyline exposure, which may cause loss of antidepressant, migraine, sleep, or neuropathic pain control. In a clinical study, comedication reduced amitriptyline and nortriptyline AUC, and stopping St. John's Wort can then let TCA levels rise again. St. John's Wort also adds serotonergic activity, so the risk is both reduced efficacy and unpredictable toxicity during starts and stops.
Recommendation: Avoid St. John's Wort while taking amitriptyline. If the combination is already in use, do not start or stop St. John's Wort abruptly without a medication plan; your prescriber may need symptom checks, TCA blood levels, or dose adjustment. Watch for relapse when St. John's Wort starts and for TCA side effects when it stops.
Alcohol can markedly worsen amitriptyline-related impairment. Human studies found ethanol increased free amitriptyline exposure during absorption and greatly worsened postural sway and short-term memory. The combination increases risk of falls, blackouts, unsafe driving, and overdose.
Recommendation: Avoid alcohol while taking amitriptyline, especially near bedtime doses or before driving. If you drink despite this, keep intake very low and do not drive, operate machinery, or combine with opioids, benzodiazepines, or other sleep aids. Older adults should treat this combination as especially risky.
Numbered references. Citations throughout the page link here.
Brueckle MS, Thomas ET, Seide SE et al.. Amitriptyline's anticholinergic adverse drug reactions-A systematic multiple-indication review and meta-analysis. PloS one. 2023
Network meta-analysis found amitriptyline was among the most effective treatments for fibromyalgia, showing significant pain reduction and sleep improvement comparable to FDA-approved treatments (duloxetine, milnacipran, pregabalin).
Chen LW, Chen MY, Lian ZP et al.. Amitriptyline and Sexual Function: A Systematic Review Updated for Sexual Health Practice. American journal of men's health. 2018
van den Driest JJ, Bierma-Zeinstra SMA, Bindels PJE et al.. Amitriptyline for musculoskeletal complaints: a systematic review. Family practice. 2017
Nishishinya B, Urrútia G, Walitt B et al.. Amitriptyline in the treatment of fibromyalgia: a systematic review of its efficacy. Rheumatology (Oxford, England). 2008
Wang Y, Wu C, Liu Y et al.. Comparison of Duloxetine Supplemented With Pregabalin and Amitriptyline Supplemented With Pregabalin for the Treatment of Postherpetic Neuralgia: A Double-Blind, Randomized Crossover Trial. CNS neuroscience & therapeutics. 2025
Ford AC, Wright-Hughes A, Alderson SL et al.. Amitriptyline at Low-Dose and Titrated for Irritable Bowel Syndrome as Second-Line Treatment in primary care (ATLANTIS): a randomised, double-blind, placebo-controlled, phase 3 trial. Lancet (London, England). 2023
This page is educational. Do not start, stop, or change a supplement or medication based on it without checking with a qualified healthcare professional.
Use this with your stack
Add it to your stack, see how it interacts with everything else you take, and get a Stack Score that updates the moment it does.
NutriStack is an informational and organizational tool, not a medical service, and not a substitute for professional advice. Always consult a qualified healthcare professional before starting, stopping, or changing any supplement or medication.
NutriStack