Drug Interaction Report

Sotalol and Amitriptyline: Interaction Details

A pharmacist-reviewed analysis of the Sotalol and Amitriptyline interaction: the documented clinical effects, severity rating, onset, mechanism, and management considerations, with cited references throughout.

AI-assisted, pharmacist-reviewed · AI content regenerated Jul 11, 2026 · Source data updated Jul 2, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature

Amitriptyline

Elavil
+

Sotalol

Betapace Betapace® Betapace® AF Sorine Sorine® Sotylize
Dr. Brian Staiger, PharmD, BCPS
Medically reviewed by
Dr. Brian Staiger, PharmD, BCPS
Updated Jul 2, 2026
Editorial policy · Data sources
LinkedIn
Interaction severity
Major
Potentially serious — often needs a change or close monitoring.
How we grade severity & evidence

Severity levels

  • Contraindicated: These should generally not be used together.
  • Major: Potentially serious — often needs a change or close monitoring.
  • Moderate: Can be significant — usually manageable with monitoring.
  • Minor: Usually limited clinical impact.

Evidence grades

  • Established: Well documented — supported by controlled studies or strong clinical data.
  • Probable: Good supporting evidence, though not definitively proven.
  • Suspected: Some evidence suggests this interaction, but it is not well established.
  • Possible: Limited or conflicting evidence; the interaction may occur.
  • Theoretical: Predicted from the drugs' pharmacology; not yet confirmed in people.

Ratings come from the documented interaction literature and are reviewed by a pharmacist. They describe the documented risk of the combination, not what will necessarily happen to you — your dose, timing, and health picture all matter.

Of 124 documented Sotalol interactions, 75 are rated major — including this one.
Worried about symptoms right now? Contact your pharmacist or prescriber, or call Poison Control at 1-800-222-1222 (US). Call 911 for an emergency.
At a glance + Theoretical Effects may be stronger
The Bottom Line
Combining sotalol and amitriptyline can add up to raise the risk of a dangerous heart rhythm, so this pairing is generally not recommended. Don't stop either drug yourself, but ask your doctor or pharmacist to review it.

Both of these medicines can affect your heart's rhythm. Sotalol is a heart rhythm drug, and amitriptyline (Elavil) is an older antidepressant. Each one can stretch out a part of your heartbeat called the QT interval. When you take them together, that effect can add up, which in rare cases can lead to a dangerous rapid heartbeat.

This is mainly a caution based on how these drugs work rather than lots of real-world cases, so please don't panic. Do not stop either medicine on your own. Let your pharmacist or doctor know you take both, so they can decide the safest plan and check your heart if needed.

Mechanism: Additive QT prolongation. Sotalol (Class III antiarrhythmic, potassium channel blockade) and amitriptyline (TCA with intrinsic QT-prolonging effect) combine to increase risk of QTc prolongation, torsades de pointes, and cardiac arrest. This is a pharmacodynamic interaction; neither is a prodrug and metabolism is not the concern.

  • Direction: Additive proarrhythmic effect (increased risk).
  • Onset: Rapid.
  • Evidence: Theoretical; no formal interaction studies, but consistent with known class effects.
  • Management: Concurrent Class III antiarrhythmic plus TCA is not recommended. If unavoidable, correct electrolytes (K+, Mg2+), obtain baseline and follow-up ECGs, and minimize other QT-prolonging agents.
Onset
rapid
Evidence
theoretical
Severity
Major

What happens

An increased risk of cardiotoxicity (QT prolongation, torsades de pointes, cardiac arrest)

Interaction Deep Dive

Reports of QTc prolongation, torsades de pointes, or both have occurred with every Class III antiarrhythmic drug, such as acecainide3, amiodarone 4, azimilide 5, bretylium 6, ibutilide 7, sematilide 8, dofetilide 9, and sotalol 10. Although no formal studies of drug interactions have been conducted, giving Class III antiarrhythmics together with other agents recognized to lengthen the QTc interval, including tricyclic antidepressants, is not advised 211.

Why it happens (mechanism)

Additive QT prolongation

How to manage this interaction

The general recommendation is to avoid using these two together because both prolong the QT interval. Your care team may choose a different antidepressant or a different heart rhythm option instead.

  • Keep taking both exactly as prescribed until your prescriber tells you otherwise. Do not stop on your own.
  • Tell your pharmacist and doctor that you take both so they can review the combination.
  • Your team may check your heart with an ECG and monitor you more closely if both are needed.
  • Report fainting, dizziness, palpitations, or a racing heartbeat right away.

Management is individual — confirm any change with your pharmacist or prescriber.

Literature reports

2 reports — tap to read

a) Electrocardiographic changes documented in patients taking therapeutic doses of tricyclic antidepressants include a faster heart rate, lengthened PR interval, delays in intraventricular conduction, a longer corrected QT interval (QTc), and flattened T waves 1.

b) Simultaneous administration of Class III antiarrhythmic agents, along with other medications capable of prolonging the QT interval, such as tricyclic antidepressants, is not advised. Dofetilide should be discontinued for a minimum of 2 days prior to starting any interacting drug. When concurrent use cannot be prevented, careful dosing and telemetric monitoring is recommended 2.

Common questions

Can I take Sotalol and Amitriptyline together?

Combining sotalol and amitriptyline can add up to raise the risk of a dangerous heart rhythm, so this pairing is generally not recommended. Don't stop either drug yourself, but ask your doctor or pharmacist to review it. Always confirm with your pharmacist or prescriber before making any change.

How serious is the Sotalol and Amitriptyline interaction?

It is rated major. Potentially serious — often needs a change or close monitoring.

How quickly could this interaction happen?

The documented onset is "rapid". Effects can appear quickly, often within about 24 hours of combining the drugs.

How is the Sotalol and Amitriptyline interaction managed?

The general recommendation is to avoid using these two together because both prolong the QT interval. Your care team may choose a different antidepressant or a different heart rhythm option instead. Keep taking both exactly as prescribed until your prescriber tells you otherwise. Do not stop on your own. Tell your pharmacist and doctor that you take both so they can review the combination. Your te… Management is individual — always follow your own care team's guidance.

How strong is the evidence for this interaction?

The evidence is graded "theoretical". Predicted from the drugs' pharmacology; not yet confirmed in people.

From our Q&A

Real reader questions about these medications, each personally answered by our pharmacist:

Questions for your pharmacist

  • Does my dose of Sotalol or Amitriptyline need adjusting while I take them together?
  • What symptoms should prompt me to call you or my prescriber right away?
  • Does the timing of my doses matter for this combination?
  • Is there a safer alternative to one of these medications for me?

References (11)

  1. Marshall JB & Forker AD: Cardiovascular effects of tricyclic antidepressant drugs: therapeutic usage, overdose, and management of complications. Am Heart J 1982; 103:401-414. PubMed
  2. Yamreudeewong W, DeBisschop M, Martin LG, et al: Potentially significant drug interactions of class III antiarrhythmic drugs. Drug Safety 2003; 26(6):421-438. PubMed
  3. Chow MJ, Piergies AA, Bowsher DJ, et al: Torsade de pointes induced by N-acetylprocainamide. J Am Coll Cardiol 1984; 4:621-624. PubMed
  4. Faggiano P, Gardini A, D'Aloia A, et al: Torsade de pointes occurring early during oral amiodarone treatment. Int J Cardiol 1996; 55(2):205-208. DOI
  5. Corey AE, Agnew JR, Valentine SN, et al: Azimilide pharmacokinetics following intravenous and oral administration of a solution and capsule formulation. J Clin Pharmacol 1999; 39(12):1272-1276. PubMed
  6. Gilman AG, Goodman LS, Rall TW, et alGilman AG, Goodman LS, Rall TW, et al (Eds): The Pharmacological Basis of Therapeutics, 7th. Macmillan Publishing Co, New York, NY, 1985.
  7. Rodriguez I, Kilborn MJ, Liu XK, et al: Drug-induced QT prolongation in women during the menstrual cycle. JAMA 2001; 285(10):1322-1326. PubMed
  8. Singh BN: The coming of age of the class III antiarrhythmic principle: retrospective and future trends. Am J Cardiol 1996; 78(suppl):17-27. PubMed
  9. Allen MJ, Oliver SD, Newgreen MW, et al: Pharmacodynamic effect of continuous vs intermittent dosing of dofetilide on QT interval. Br J Clin Pharmacol 2002; 53:59-65.
  10. Marill KA & Runge T: Meta-analysis of the risk of torsades de pointes in patients treated with intravenous racemic sotalol. Acad Emerg Med 2001; 8(2):117-124. PubMed
  11. Product Information: Corvert(R), ibutilide fumarate injection. Pharmacia & Upjohn Company, Kalamazoo, MI, 2000. DailyMed
Was this write-up helpful?
Amitriptyline

Keep reading about Amitriptyline

All Amitriptyline interactions (525)
Also serious with: Safinamide Procarbazine Potassium Citrate Potassium Chloride
Sotalol

Keep reading about Sotalol

All Sotalol interactions (124) Sotalol drug information
Also serious with: Sertraline Oxaliplatin Injection Dasatinib Eribulin Injection
Beyond drug–drug

These medications also interact with supplements

Prescription drugs aren't the whole picture — herbal and dietary supplements can interact with them too. From the evidence-graded Natural Medicines database:

Amitriptyline + 1,4-butanediol Activated Charcoal American Hellebore Arsenic Beer Cesium Ephedra Gamma-hydroxybutyrate (ghb) + 288 more
Sotalol + Activated Charcoal American Hellebore Arsenic Cesium Ephedra Grapefruit Indian Snakeroot Sida Cordifolia + 35 more

major · moderate · minor — check everything you take with our drug–supplement interaction checker.

Check another combination

Our instant two-drug interaction checker is almost here.

Coming soon

The instant two-drug checker is on its way.

In the meantime, browse the directory below to look up any drug and see its documented interactions.

Still have questions about this combination?

Every question gets a real answer from a licensed pharmacist — free, and usually within a day.

Ask the pharmacist
This information is for education, not a substitute for professional medical advice. Do not start, stop, or change any medication without talking to your pharmacist or prescriber.