Atenolol and Lacosamide: Interaction Details
AI-assisted, pharmacist-reviewed · AI content regenerated Jul 15, 2026 · Source data updated Jul 11, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature
Lacosamide
Atenolol
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.
Both of these medicines can slow down your heart's electrical system. Lacosamide (Vimpat) is a seizure medicine, and atenolol (Tenormin) is a beta blocker for blood pressure and heart rate. When taken together, their effects can add up, which may lead to a heartbeat that is too slow (bradycardia) or an irregular rhythm.
The good news is that this is a theoretical concern, meaning it is based on how the drugs work rather than lots of real-world reports. Your care team can manage it easily, often by checking an ECG (heart tracing) and keeping an eye on your heart rate. Let your doctor or pharmacist know if you feel dizzy, faint, or notice a very slow or fluttering heartbeat.
Mechanism: Additive depressant effects on cardiac conduction. Both agents can prolong AV conduction, so concomitant use raises the theoretical risk of AV block, bradycardia, and ventricular tachyarrhythmia. This is a pharmacodynamic (not metabolic) interaction; neither agent is a prodrug.
- Direction: Additive negative dromotropic/chronotropic effect.
- Evidence: Theoretical; per-label caution.
- Onset: Unspecified.
- Management: Obtain baseline ECG before initiating lacosamide and again after titration to steady-state maintenance dose. Monitor closely, particularly with IV lacosamide. Dose should be individualized by the care team; watch for symptomatic bradycardia or conduction abnormalities.
What happens
An increased risk of AV block, bradycardia, and ventricular tachyarrhythmia
Interaction Deep Dive
When lacosamide is given alongside other agents that influence cardiac conduction, such as beta blockers, caution is warranted because of the potential for AV block, bradycardia, and ventricular tachyarrhythmia. An ECG should be performed prior to initiating lacosamide and again once the drug has been titrated to its steady-state maintenance dose12. Furthermore, careful monitoring is advised when lacosamide is delivered by the IV route2.
Why it happens (mechanism)
Additive effects on cardiac conduction
How to manage this interaction
Keep taking both medicines as prescribed unless your doctor tells you otherwise. This is a caution based on how the drugs work, and your care team has clear ways to manage it.
- Your team will usually check an ECG (heart tracing) before you start lacosamide, and again once you reach your steady maintenance dose.
- Monitoring is especially important if lacosamide is given through an IV.
- Doses may be adjusted and individualized by your care team based on your heart rate and rhythm.
- Tell your pharmacist or prescriber if you feel dizzy, lightheaded, faint, or notice a slow or irregular heartbeat.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Atenolol and Lacosamide together?
Taking lacosamide with atenolol can add up to slow the heart or cause rhythm changes, so your care team will typically check an ECG and monitor your heart. Keep taking both as prescribed and report any dizziness, fainting, or slow/irregular heartbeat. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Atenolol and Lacosamide interaction?
It is rated major. Potentially serious — often needs a change or close monitoring.
How quickly could this interaction happen?
The documented onset is "unspecified". The timing of this interaction is not well characterized.
How is the Atenolol and Lacosamide interaction managed?
Keep taking both medicines as prescribed unless your doctor tells you otherwise. This is a caution based on how the drugs work, and your care team has clear ways to manage it. Your team will usually check an ECG (heart tracing) before you start lacosamide, and again once you reach your steady maintenance dose. Monitoring is especially important if lacosamide is given through an IV. Doses may be ad… 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.
Questions for your pharmacist
- Does my dose of Atenolol or Lacosamide 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 (2)
- Product Information: Motpoly XR oral extended-release capsules, lacosamide oral extended-release capsules. Aucta Pharmaceuticals, Inc, Piscataway, NJ, 2023. DailyMed
- Product Information: VIMPAT(R) oral tablets, intravenous injection, oral solution, lacosamide oral tablets, intravenous injection, oral solution. UCB Inc (per FDA), Smyrna, GA, 2018. DailyMed
Keep reading about Lacosamide
Keep reading about Atenolol
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