Lidoflazine and Atenolol: 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
Atenolol
Lidoflazine
No brand names on record
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 slow and calm your heart. Atenolol is a beta blocker, and lidoflazine works a bit like a calcium channel blocker with some rhythm effects too. When you take them together, their effects can add up. That could make your heart rate too slow, drop your blood pressure, or slow the electrical signals inside your heart.
The good news: this is based on how similar drugs behave, not on real reported cases, so for most people it stays quiet. Folks with a weak heart pump or slow heart rhythms need the most care. Your care team can watch your heart and blood pressure and adjust things as needed. Please don't stop either medicine on your own.
Mechanism: Additive negative chronotropic, dromotropic, and inotropic effects. Atenolol (beta-1 blockade) plus lidoflazine (calcium channel blocking plus antiarrhythmic properties) can compound suppression of SA/AV node conduction and myocardial contractility. Neither agent requires bioactivation.
Effect / direction: Potential hypotension, bradycardia, and AV conduction disturbances; delayed onset.
Evidence: Theoretical, extrapolated from other calcium channel blockers; no documented cases.
- Highest risk: impaired LV function, pre-existing conduction disease, aortic stenosis.
- Proarrhythmia concern greatest with membrane-stabilizing beta blockers (sotalol, propranolol); atenolol has minimal MSA.
- Monitor HR, BP, and ECG (PR interval); individualize dosing.
What happens
Hypotension, bradycardia, and AV conduction disturbances
Interaction Deep Dive
Pairing lidoflazine with beta blocking agents is probably going to be uneventful, though it carries the potential to produce hypotension, bradycardia, or diminished cardiac performance because of additive actions that lower cardiac contractility and slow conduction through the AV node. Although no reported cases describe these adverse events with this particular pairing, evidence gathered from other calcium channel blockers suggests such effects would be most likely in individuals with impaired left ventricular function, compromised cardiac conduction, or aortic stenosis345. Because lidoflazine also exerts additional antiarrhythmic cardiac effects, there may be a heightened proarrhythmic risk when it is combined with beta blockers that have substantial membrane stabilizing activity, notably sotalol and propranolol6.
Why it happens (mechanism)
Additive cardiovascular effects
How to manage this interaction
If your prescriber decides you need both medicines, they can manage this safely.
- Keep taking both as prescribed unless your doctor or pharmacist tells you otherwise.
- Your care team may monitor your heart rate, blood pressure, and heart rhythm (ECG) more closely, especially if you have heart failure, a slow heartbeat, or conduction problems.
- Your doses may need to be adjusted and individualized by your care team.
- Tell your prescriber or pharmacist if you feel dizzy, faint, unusually tired, or notice a very slow or irregular heartbeat.
Management is individual — confirm any change with your pharmacist or prescriber.
Literature reports
1 report — tap to read
a) Among angina patients who had been stabilized on propranolol, lidoflazine was introduced incrementally to a maximum of 360 mg per day. Ventricular tachycardia occurred in four of these patients. Every symptom resolved once lidoflazine was stopped 1. In contrast, a separate study that paired lidoflazine, titrated up to 360 mg daily, with propranolol at doses of 80 mg to 400 mg daily found no indication of heightened arrhythmogenesis. Relative to propranolol given alone, the combination produced a significant lengthening of the QT interval, yet no ventricular tachycardia developed. Furthermore, the lidoflazine-propranolol pairing did not yield a significant enhancement of exercise tolerance when measured against propranolol alone 2.
Common questions
Can I take Lidoflazine and Atenolol together?
Taking atenolol with lidoflazine can add up to slow your heart, lower your blood pressure, or affect heart conduction, though this is theoretical and most likely to matter in people with weak heart function or slow rhythms. Keep taking both as prescribed and let your care team monitor and adjust as needed. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Lidoflazine and Atenolol interaction?
It is rated moderate. Can be significant — usually manageable with monitoring.
How quickly could this interaction happen?
The documented onset is "delayed". Effects tend to build up gradually over days to weeks.
How is the Lidoflazine and Atenolol interaction managed?
If your prescriber decides you need both medicines, they can manage this safely. Keep taking both as prescribed unless your doctor or pharmacist tells you otherwise. Your care team may monitor your heart rate, blood pressure, and heart rhythm (ECG) more closely, especially if you have heart failure, a slow heartbeat, or conduction problems. Your doses may need to be adjusted and individualized by… 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 Lidoflazine or Atenolol 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 anything you'd monitor while I'm on both?
References (6)
- Hanley SP & Hampton JR: Ventricular arrhythmias associated with lidoflazine: side-effects observed in a randomized trial. Eur Heart J 1983; 4(12):889-893. PubMed
- Charlap S, Kimmel B, Berezow J, et al: Lidoflazine and propranolol combination treatment in chronic stable angina. Angiology 1985; 36:240-252. DOI
- Robson RH & Vishwanath MC: Nifedipine and beta-blockade as a cause of cardiac failure. Br Med J 1982; 284:104. DOI
- Anastassiades C: Nifedipine and beta-blockade as a cause of cardiac failure (letter). Br Med J Clin Res Ed 1982; 284:506. PubMed
- Maclean D, Mitchell ET, Coulson RR, et al: Atenolol-nifedipine combinations compared to atenolol alone in hypertension: efficacy and tolerability. Br J Clin Pharmacol 1988; 25:425-431. DOI
- Hanley SP & Hampton JR: Ventricular arrhythmias associated with lidoflazine: side effects observed in a randomized trial. Eur Heart J 1983; 4:889-893. DOI
Keep reading about Atenolol
Keep reading about Lidoflazine
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