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Ivabradine – Uses, Mechanism & Side Effects
Ivabradine is a heart medication that reduces heart rate without affecting blood pressure. It is used in chronic heart failure and stable angina pectoris.
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Ivabradine is a heart medication that reduces heart rate without affecting blood pressure. It is used in chronic heart failure and stable angina pectoris.
What is Ivabradine?
Ivabradine is a heart rate-reducing medication belonging to the class of selective sinus node inhibitors. It is primarily used to treat chronic heart failure and stable angina pectoris (chest pain caused by reduced blood flow to the heart). Unlike many other cardiac medications, ivabradine exclusively reduces heart rate without significantly affecting blood pressure or the contractile strength of the heart muscle.
Indications
Ivabradine is approved for the following conditions:
- Chronic heart failure: In patients with reduced left ventricular ejection fraction (LVEF ≤ 35%), sinus rhythm, and a resting heart rate of ≥ 75 beats per minute, used in combination with standard therapy including beta-blockers.
- Stable angina pectoris: In adults with coronary artery disease and sinus rhythm when beta-blockers are not tolerated or are contraindicated.
Mechanism of Action
Ivabradine selectively inhibits the If channel (also known as the funny channel) located in the sinus node of the heart. This ion channel controls the pacemaker current and thus determines the spontaneous depolarization rate of sinus node cells. By blocking the If channel, the rate of depolarization is slowed, resulting in a reduction of heart rate. Because this mechanism is specific to the sinus node, blood pressure regulation and myocardial contractility remain unaffected.
Dosage
Dosage of ivabradine is determined individually by the treating physician. General guidelines according to the prescribing information are:
- Starting dose: typically 5 mg twice daily (morning and evening with meals).
- Adjustment: Depending on tolerability and heart rate, the dose may be increased to 7.5 mg twice daily.
- Reduction: If resting heart rate falls below 50 beats per minute, the dose should be reduced to 2.5 mg twice daily or the medication should be discontinued.
- Special populations: Caution is advised in elderly patients and those with hepatic impairment.
Side Effects
Ivabradine is generally well tolerated, but may cause the following side effects:
- Very common: Luminous phenomena (phosphenes) – perceived flashes of light or bright spots in the visual field, especially with sudden changes in light intensity. These are usually transient and harmless.
- Common: Bradycardia (abnormally slow heart rate), blurred vision.
- Uncommon: Headache, dizziness, nausea, cardiac arrhythmias (e.g., atrial fibrillation).
- Rare: Hypersensitivity reactions, erythema multiforme.
Contraindications
Ivabradine must not be used in patients with:
- Resting heart rate below 70 beats per minute before starting treatment
- Cardiogenic shock or acute myocardial infarction
- Severe hypotension (low blood pressure)
- Sick sinus syndrome or second- and third-degree AV block (without a pacemaker)
- Severe hepatic insufficiency
- Pregnancy and breastfeeding
- Concomitant use of strong CYP3A4 inhibitors (e.g., ketoconazole, clarithromycin)
Drug Interactions
Ivabradine is metabolized in the liver via the enzyme CYP3A4. The following interactions are clinically relevant:
- CYP3A4 inhibitors (e.g., itraconazole, verapamil, diltiazem): Increase ivabradine plasma levels and thus the risk of bradycardia.
- CYP3A4 inducers (e.g., rifampicin, St. John's wort): Reduce the effectiveness of ivabradine.
- Bradycardia-promoting medications (e.g., beta-blockers, digoxin, amiodarone): Increased risk of excessive heart rate reduction.
Treatment Context
Ivabradine is always used as part of a comprehensive cardiac treatment plan and does not replace other heart medications. In heart failure, it is prescribed alongside ACE inhibitors, beta-blockers, and diuretics. In angina pectoris, it serves as an alternative or add-on therapy when beta-blockers are insufficient or not tolerated. Regular heart rate monitoring by the treating physician is required throughout therapy.
References
- European Medicines Agency (EMA): Procoralan (Ivabradine) – Product Information and EPAR. www.ema.europa.eu
- Ponikowski P et al. – 2016 ESC Guidelines for the diagnosis and treatment of acute and chronic heart failure. European Heart Journal, 2016.
- Fox K et al. – Ivabradine for patients with stable coronary artery disease and left-ventricular systolic dysfunction (BEAUTIFUL): a randomised, double-blind, placebo-controlled trial. The Lancet, 2008.
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