Amitriptyline (Elavil)

Introduced 1961

Reviewed by the HeyPsych Medical Review Board

Board-certified psychiatrists and mental health professionals

Published November 29, 2025•Updated November 29, 2025•Reviewed November 29, 2025

Clinical summary for Amitriptyline (Elavil): Amitriptyline (often known by the old brand name Elavil) is an older antidepressant that can help with depression, chronic pain, migraines, and some gut or bladder pain conditions. It is usually taken at night because it can cause drowsiness and a dry mouth. At low doses it is often used more for pain and sleep, and at higher doses it is used for depression. It has important safety warnings: it can increase suicidal thoughts in some younger patients, can affect the heart (especially in overdose), and should not be taken with certain other medicines like MAOIs. Doses need to be started low and increased slowly under medical supervision.

What It's Used For

Amitriptyline is approved for major depressive disorder in adults and is widely used off-label at lower doses for multiple chronic pain and headache conditions.

Primary Indications

major depressive disorder (unipolar)

Off-Label Uses

Chronic neuropathic pain (eg, diabetic neuropathy, postherpetic neuralgia).Migraine prevention.Chronic tension-type headache prevention.Fibromyalgia (sleep and pain modulation).Irritable bowel syndrome–associated pain and global symptoms.Interstitial cystitis / bladder pain syndrome.

Patient-Friendly Explanation

Amitriptyline is approved for depression and is also commonly used in much lower doses to help with nerve pain, migraine prevention, and some chronic gut or bladder pain conditions.

What People Feel

Experiences vary with dose and indication, but common themes reported by patients include:

Sedation & Sleep

"It really knocked me out at night, which helped my sleep but made mornings rough."

How Fast It Works

Initial antidepressant effects typically appear within 1–2 weeks, with full benefits often requiring 4–6 weeks or longer. For pain and sleep indications, some benefit can occur within days to a couple of weeks. The elimination half-life is 13–36 hours, allowing once-daily dosing in many patients.

1–2 weeks

Early antidepressant effects may emerge.

4–6+ weeks

Full antidepressant response is often seen.

Days to weeks

Pain and migraine benefits may begin at low doses.

13–36 hours

Elimination half-life, supporting once-daily dosing (often at bedtime).

How Well It Works

Response vs Placebo (18 RCTs, n=1,987)

2.7× more effective

vs vs placebo; NNT ≈ 4–5

A Cochrane meta-analysis found that amitriptyline was significantly more effective than placebo for acute treatment response in major depression. The odds of response with amitriptyline were approximately 2.7 times higher than with placebo (OR 2.67, 95% CI 2.21–3.23), corresponding to an estimated number needed to treat of 4–5. More patients discontinued due to adverse effects, reflecting substantial side-effect burden.

Warnings & Precautions ⚠️

Antidepressants, including amitriptyline, increase the risk of suicidal thinking and behavior in children, adolescents, and young adults in short-term studies. Carefully weigh this risk against clinical need and monitor all patients—especially during the first 1–2 months and during dose changes. Amitriptyline is not approved for use in pediatric patients.

→Report any new or worsening sadness, irritability, agitation, or suicidal thoughts immediately, especially in the first weeks of treatment or after dose changes.
→Avoid alcohol and be cautious with other medicines that cause drowsiness; these can dangerously increase sedation.
→Rise slowly from sitting or lying positions to reduce dizziness and fainting.
→Do not stop amitriptyline suddenly after several weeks or months of use; your doctor will usually taper the dose to reduce withdrawal symptoms.
→Keep this medicine out of reach of children and others due to serious overdose risk.

Side Effects

Side effects are driven largely by strong anticholinergic, antihistaminic, and alpha-1 adrenergic blockade, with important cardiac and CNS risks at higher doses or in overdose.

Common Things People Notice

Drowsiness or feeling very sleepy, especially at first.
Dry mouth, constipation, blurred vision, and difficulty urinating.
Weight gain and increased appetite over time.
Dizziness or lightheadedness, especially when standing up.
Sweating, tremor, headache, nervousness, or agitation.
Sexual side effects such as reduced libido or trouble with arousal.

Common Side Effects

Very common

Sedation / drowsiness / fatigue— Often helpful for sleep at night, but can cause morning grogginess or daytime sleepiness.

Very common (anticholinergic effects)

Dry mouth, constipation, blurred vision, urinary hesitancy— These are typical for TCAs; increase fluids and fiber, and contact your clinician if urinary retention or severe constipation occurs.

Common

Weight gain, increased appetite— May cause gradual weight gain; monitoring diet and weight is recommended.

Common

Orthostatic hypotension, dizziness, lightheadedness— Can cause falls, especially in older adults; stand up slowly and use caution with driving.

Common

Sweating, tremor, headache, nervousness or agitation

Common

Sexual dysfunction (decreased libido, erectile dysfunction)

⚠️ Serious Side Effects

Suicidal thoughts or behaviors (boxed warning) particularly in children, adolescents, and young adults.
Cardiac conduction abnormalities (PR/QRS/QT prolongation), arrhythmias, and sudden death—especially in overdose or in patients with underlying heart disease.
Acute myocardial infarction or stroke exacerbation in predisposed patients.
Seizures (lowered seizure threshold).
Severe anticholinergic toxicity (hyperthermia, ileus, urinary retention, delirium), particularly in overdose or in older adults.
Hyponatremia/SIADH, especially in older adults or with concomitant diuretics.
Hepatotoxicity (rare hepatitis or liver failure).
Angle-closure glaucoma precipitation in susceptible patients.
Neuroleptic malignant syndrome and serotonin syndrome (usually with interacting drugs).

Critical Drug Interactions

Amitriptyline has important interactions through serotonergic mechanisms, CYP2D6 metabolism, anticholinergic burden, and cardiac conduction effects.

With: MAOIs (eg, phenelzine, tranylcypromine, selegiline, isocarboxazid, linezolid, methylene blue)

Risk: High risk of serotonin syndrome and hypertensive crisis.

Action: Contraindicated; allow at least 14 days between stopping an MAOI and starting amitriptyline, and vice versa.

With: Other serotonergic agents (SSRIs, SNRIs, triptans, tramadol, St. John’s wort, certain opioids)

Risk: Increased risk of serotonin syndrome.

Action: Use with caution; monitor closely for serotonin toxicity.

With: CYP2D6 inhibitors (eg, fluoxetine, paroxetine, bupropion, some antipsychotics)

Risk: Increased amitriptyline and nortriptyline levels; greater side effects and QT risk.

Action: Consider dose reductions of amitriptyline and monitor for toxicity.

With: Other QT-prolonging drugs and antiarrhythmics

Risk: Additive risk of QT prolongation and malignant arrhythmias.

Action: Avoid or use with ECG monitoring and correction of electrolytes.

With: CNS depressants (benzodiazepines, opioids, sedative-hypnotics, alcohol)

Risk: Enhanced CNS and respiratory depression, increased overdose risk.

Action: Avoid combinations when possible; if used, use lowest effective doses and counsel about overdose danger.

With: Strong anticholinergic drugs (eg, oxybutynin, some antipsychotics, antihistamines)

Risk: Marked anticholinergic toxicity (urinary retention, ileus, delirium, hyperthermia).

Action: Avoid or minimize use; monitor closely in high-risk patients.

With: Sympathomimetics and thyroid products

Risk: Potentiation of cardiovascular effects (tachycardia, hypertension, arrhythmias).

Action: Monitor BP and heart rate; consider dose adjustments.

Safe Discontinuation

When discontinuing amitriptyline after ≥4 weeks of treatment, gradual tapering over 2–4 weeks (or longer for high doses or long-term therapy) is recommended to minimize withdrawal symptoms (eg, nausea, headache, insomnia, irritability, flu-like symptoms, rebound anxiety/depression). Longer tapers (≥3 months) may be helpful after multi-year treatment or in patients with prior discontinuation syndromes.

Patient-Friendly Explanation

Do not stop amitriptyline suddenly. Your doctor will usually lower the dose slowly over weeks or months to reduce the risk of withdrawal symptoms and relapse of depression or pain.

Dosing Information

Adult Dosing

depression initial: 25–50 mg/day as a single bedtime dose or in divided doses.

depression titration: Increase by 25–50 mg/day at intervals of ≥1 week based on response and tolerability.

depression usual: 100–300 mg/day in 1–3 divided doses (higher doses generally reserved for inpatients or closely supervised patients).

chronic pain low dose: 10–25 mg at bedtime; titrate by 10–25 mg every 1–2 weeks to usual range 25–75 mg/day (max 100–150 mg/day depending on indication and tolerability).

migraine prophylaxis: 10–25 mg at bedtime; may increase gradually to 50–100 mg/day based on response and side effects.

notes: Start low and go slow, especially in older adults or patients sensitive to anticholinergic or sedating effects. Give higher total doses at bedtime when feasible to minimize daytime sedation.

Renal Dose Adjustments

Condition	Dose
Mild–severe kidney impairment, including dialysis	No formal adjustment typically needed; use with caution and start at the low end of the dose range.

Hepatic Dose Adjustments

Hepatic impairment (cirrhosis or chronic liver disease): Use lower initial doses (≈50% of usual) and titrate slowly; avoid in severe hepatic impairment or encephalopathy.

Patient-Friendly Explanation

For depression, the dose usually starts low (25–50 mg a day) and is increased slowly up to 100–300 mg a day if needed. For pain or migraines, much lower doses are used (often 10–25 mg at night, sometimes up to 50–75 mg). Your doctor will adjust the dose based on how you feel and what side effects you have.

Pregnancy, Breastfeeding, Special Groups

Amitriptyline requires careful risk–benefit consideration in pregnancy, breastfeeding, pediatric, and geriatric populations.

👶Pregnancy

TCAs are not considered first-line in pregnancy but may be continued when benefits clearly outweigh risks, especially if previously effective. Limited data do not show a clear major malformation signal, but there are case reports of neonatal adaptation symptoms. Untreated depression also carries obstetric and neonatal risks; decisions should involve shared decision-making.

🤱Breastfeeding

Amitriptyline and nortriptyline appear in breast milk at low levels. Most reports suggest low risk, but rare cases of infant sedation have been described. Monitor infants for excessive sleepiness or poor feeding; consider alternative agents if starting a new antidepressant in a breastfeeding parent.

👧Children & Adolescents (Under 18)

Not FDA-approved in children or adolescents for depression; TCAs are generally avoided as first-line in this population due to limited efficacy data and safety concerns. If used for pain or other indications, dosing must be carefully weight-based and monitored.

👴Older Adults (65+)

Listed as potentially inappropriate (Beers/STOPP) due to strong anticholinergic effects, orthostatic hypotension, falls, and cognitive effects. Prefer alternatives when possible; if used, start very low, titrate slowly, and monitor closely.

Clinical Monitoring

Mood symptoms, suicidality, anxiety, agitation, and overall functioning (especially during first 1–2 months and after dose changes).
Heart rate, blood pressure, and ECG in patients with cardiac disease, in older adults, or at higher doses.
Electrolytes (particularly sodium) in older adults or those at risk for SIADH/hyponatremia.
Weight and BMI, metabolic parameters if clinically indicated.
Liver function tests if symptoms suggest hepatotoxicity (jaundice, dark urine, abdominal pain).
Signs of anticholinergic toxicity (confusion, urinary retention, severe constipation, visual changes).
Serum amitriptyline/nortriptyline levels in selected cases (eg, toxicity, nonresponse, complex pharmacokinetics).

Available Formulations

Oral tablets: 10 mg, 25 mg, 50 mg, 75 mg, 100 mg, 150 mg (strengths vary by market and manufacturer).

Mechanism of Action

Amitriptyline inhibits the reuptake of serotonin and norepinephrine into presynaptic neurons, increasing their levels in the synaptic cleft. It also has strong antihistaminic (H1-blocking), anticholinergic (muscarinic-blocking), and alpha-1 adrenergic–blocking properties. These additional receptor effects contribute to its sedative properties, weight gain, dry mouth, constipation, blurred vision, orthostatic hypotension, and cardiac conduction effects. At lower doses it appears to modulate descending pain pathways in the central nervous system, which underlies its benefit in neuropathic pain and migraine prevention.

Patient-Friendly Explanation

Amitriptyline works by increasing certain brain chemicals (serotonin and norepinephrine) that affect mood and pain. It also blocks other receptors, which is why it can make you sleepy and give you a dry mouth or constipation.

Place in Treatment Algorithm

Amitriptyline is a highly efficacious but less well-tolerated antidepressant compared with many newer agents. For major depressive disorder, it is usually considered after SSRIs, SNRIs, and other first-line options, particularly in patients without significant cardiac disease and with low suicide risk. At low doses, it occupies a key role in the management of chronic neuropathic pain and migraine, often at doses below those used for depression. In older adults, amitriptyline is generally avoided due to anticholinergic and cardiovascular risks; if a TCA is needed, secondary amines such as nortriptyline may be better tolerated.

Clinical Pearls ✨

Highly efficacious for MDD vs placebo but less favored today due to anticholinergic burden, sedation, weight gain, and overdose lethality.
Low-dose (10–25 mg) bedtime regimens often provide meaningful benefit for chronic pain and migraine with a more tolerable side-effect profile than antidepressant-level doses.
Avoid in patients with significant cardiac conduction disease or high suicide risk when safer alternatives are available.
In older adults, amitriptyline is usually avoided; nortriptyline or other agents may be better tolerated if a TCA is needed.
Therapeutic drug monitoring (combined amitriptyline + nortriptyline 80–200 ng/mL) can help optimize dosing or evaluate suspected toxicity.

Availability and Regulatory Status

Amitriptyline is widely available as a generic oral tablet in multiple strengths in the US, Canada, and many other countries. The Elavil brand is discontinued in some markets but the molecule remains commonly prescribed, particularly for off-label pain and migraine indications.

Frequently Asked Questions

What is amitriptyline (Elavil) used for?

Amitriptyline is an older antidepressant used to treat major depressive disorder in adults. At lower doses it is also commonly prescribed for chronic nerve pain, migraine prevention, and certain chronic gut or bladder pain conditions.

How long does it take for amitriptyline to work?

For depression, some improvement may be noticed within 1 to 2 weeks, but full benefits usually take 4 to 6 weeks or longer. For pain or migraine prevention, some improvement can appear within days to a few weeks, with best effects often after several weeks at a stable dose.

Is amitriptyline safe for older adults?

Amitriptyline is generally not preferred in adults 65 and older because it has strong anticholinergic and sedating effects and increases the risk of falls, confusion, and constipation. When antidepressants or pain medicines are needed in older adults, safer alternatives are usually chosen first.

Can I drink alcohol while taking amitriptyline?

Alcohol can significantly increase the drowsiness and coordination problems caused by amitriptyline and makes overdose more dangerous. It is best to avoid or strictly limit alcohol use while taking this medication.

Can I stop taking amitriptyline abruptly?

Stopping amitriptyline suddenly can cause withdrawal symptoms such as nausea, headache, sleep problems, irritability, and return of depression or pain. The dose should be reduced gradually under your clinician’s supervision.

This medication information is for educational purposes only and is not a substitute for professional medical advice. Always consult your healthcare provider before starting, stopping, or changing any medication. Never take medication without a prescription from a licensed healthcare provider.

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Amitriptyline (Elavil)

Introduced 1961

Reviewed by the HeyPsych Medical Review Board

Board-certified psychiatrists and mental health professionals

Published November 29, 2025•Updated November 29, 2025•Reviewed November 29, 2025

Condition

Dose

Mild–severe kidney impairment, including dialysis

No formal adjustment typically needed; use with caution and start at the low end of the dose range.