Corlanor Drug Interactions: What to Avoid and What to Tell Your Doctor

Why Corlanor Drug Interactions Matter

When you're taking Corlanor (ivabradine) for heart failure, it's important to know which other medications, supplements, and even foods can interact with it. Some interactions can make Corlanor less effective, while others can dangerously increase its effects.

This guide covers the most important Corlanor drug interactions in plain language so you know what to watch for and what to tell your doctor.

How Drug Interactions Work With Corlanor

Corlanor is broken down in your liver by an enzyme called CYP3A4. This is the same enzyme that processes many other medications. When another drug speeds up or slows down CYP3A4, it changes how much Corlanor is in your bloodstream:

• CYP3A4 inhibitors slow down the enzyme, causing Corlanor levels to rise — potentially to dangerous levels.
• CYP3A4 inducers speed up the enzyme, causing Corlanor levels to drop — making it less effective.

On top of that, any medication that also slows heart rate can add to Corlanor's effects, increasing the risk of bradycardia (dangerously slow heart rate).

Medications That Interact With Corlanor

Contraindicated (Do NOT Take Together)

These medications should never be taken with Corlanor:

• Strong CYP3A4 inhibitors: Ketoconazole, itraconazole, clarithromycin, nefazodone, ritonavir, nelfinavir. These dramatically increase Corlanor levels and are strictly contraindicated.
• Verapamil and diltiazem: These calcium channel blockers are contraindicated with Corlanor because they both inhibit CYP3A4 and lower heart rate. The combination can cause dangerously slow heart rates.

Use With Caution

These medications can be taken with Corlanor but require careful monitoring:

• Beta-blockers (metoprolol, carvedilol, bisoprolol): Most Corlanor patients are also on a beta-blocker. This is expected and guideline-recommended, but your doctor will monitor your heart rate closely since both medications slow the heart.
• Digoxin: No direct drug-level interaction, but digoxin also slows heart rate. The combination requires heart rate monitoring.
• Amiodarone: Can cause additive bradycardia when taken with Corlanor. Your doctor may need to adjust doses.
• Other medications that slow heart rate: Clonidine, guanfacine, and other negative chronotropes can add to Corlanor's heart-slowing effect.

Medications That Reduce Corlanor's Effectiveness

These medications speed up CYP3A4 and can make Corlanor less effective:

• Rifampin (antibiotic for tuberculosis)
• Phenytoin and carbamazepine (seizure medications)
• Phenobarbital

If you need any of these medications, your doctor may need to consider an alternative to Corlanor.

Supplements and Over-the-Counter Products

Don't forget about supplements and OTC products — these can interact with Corlanor too:

• St. John's Wort: This popular herbal supplement is a strong CYP3A4 inducer. It can significantly reduce Corlanor levels in your blood, making the medication less effective. Avoid St. John's Wort while taking Corlanor.
• Herbal supplements that affect heart rate: Some supplements like hawthorn, valerian, or high-dose magnesium may have mild heart rate-lowering effects. Talk to your doctor before taking them with Corlanor.

Food and Drink Interactions

Grapefruit Juice

Grapefruit juice is a moderate CYP3A4 inhibitor. Drinking large amounts can roughly double the amount of Corlanor in your blood. While small amounts may not cause problems, it's best to avoid grapefruit juice or limit intake significantly while taking Corlanor.

Take With Food

Corlanor should be taken with meals. Food helps your body absorb the medication properly and can reduce nausea.

What to Tell Your Doctor

Before starting Corlanor, make sure your doctor knows about:

• All prescription medications you're taking, especially heart medications, antibiotics, antifungals, HIV medications, and seizure drugs
• All supplements and herbal products, particularly St. John's Wort
• Over-the-counter medications you use regularly
• Any new medications added by other doctors — always mention that you're on Corlanor

It's a good idea to keep an updated medication list in your wallet or phone. Any time a new doctor or pharmacist asks what you're taking, you'll have everything in one place.

Your pharmacist is also an excellent resource. They can check for interactions every time you fill a new prescription. Learn more about finding the right doctor for your Corlanor prescription.

Final Thoughts

Corlanor is a safe and effective medication when taken correctly, but it does interact with a number of common drugs, supplements, and foods. The most important ones to remember are strong CYP3A4 inhibitors (contraindicated), verapamil and diltiazem (contraindicated), St. John's Wort (avoid), and grapefruit juice (limit).

When in doubt, ask your doctor or pharmacist before starting anything new. And if you need help finding Corlanor at a pharmacy near you, MedFinder can help you check stock online.