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What Is Ranolazine?

Ranolazine is a prescription antianginal medication used to manage chronic angina. It is the active ingredient in Ranexa and is available in generic extended-release oral tablets. Chronic angina involves recurring chest discomfort resulting from insufficient blood supply to the heart muscle, commonly associated with coronary artery disease. Ranolazine may be used alongside other cardiovascular medications when clinically appropriate. It differs from many other antianginal drugs because it generally has limited effects on resting heart rate and blood pressure. Ranolazine is not an emergency treatment for sudden chest pain or a heart attack.

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What Is Ranolazine?

Ranolazine is a prescription antianginal medication used to manage chronic angina. It is the active ingredient in Ranexa and is available in generic extended-release oral tablets. Chronic angina involves recurring chest discomfort resulting from insufficient blood supply to the heart muscle, commonly associated with coronary artery disease. Ranolazine may be used alongside other cardiovascular medications when clinically appropriate. It differs from many other antianginal drugs because it generally has limited effects on resting heart rate and blood pressure. Ranolazine is not an emergency treatment for sudden chest pain or a heart attack.

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How Does Ranolazine Work?

Ranolazine is believed to reduce the late sodium current in cardiac muscle cells. During myocardial ischemia, excessive sodium entry can contribute to calcium accumulation and impaired relaxation of the heart muscle. Reducing this current may help improve myocardial relaxation and decrease angina symptoms. The precise mechanism responsible for its clinical benefits remains incompletely established. Ranolazine does not primarily work by slowing the heart or dilating blood vessels. It can also prolong the QT interval, so clinicians must consider potential electrical effects on the heart and interactions with other medications.

What Conditions Does Ranolazine Treat?

Ranolazine extended-release tablets are FDA-approved for chronic angina in adults. They can be prescribed alone or in combination with selected antianginal medications, including beta blockers, nitrates, or calcium channel blockers, when appropriate. Patients with recurring chest discomfort may benefit from reduced symptom frequency and improved ability to perform activities, although individual responses vary. Ranolazine is not approved to treat an acute myocardial infarction, terminate sudden angina attacks, or prevent every cardiovascular complication. Clinicians assess coronary disease, liver function, kidney function, heart rhythm risks, and medication interactions before beginning treatment.

How Should Ranolazine Be Taken?

Ranolazine extended-release tablets are usually started at 500 mg orally twice daily. The dose may be increased to 1,000 mg twice daily when additional symptom control is needed and the medication is tolerated. Tablets may be taken with or without meals but must be swallowed whole. Strong CYP3A inhibitors, strong CYP3A inducers, and liver cirrhosis are contraindications. When taken with moderate CYP3A inhibitors, including diltiazem or verapamil, the maximum ranolazine dose is 500 mg twice daily. Other medication interactions may require dose changes or monitoring. If a dose is missed, patients should take the next scheduled dose without doubling.

What Are the Side Effects and Warnings of Ranolazine?

Common adverse reactions include dizziness, headache, constipation, and nausea. Ranolazine can prolong the QT interval and requires caution in patients with known rhythm abnormalities or concurrent QT-prolonging drugs. Acute renal failure has been reported in some patients with severe kidney impairment, and monitoring may be needed in moderate to severe kidney dysfunction. Ranolazine can increase exposure to certain medications, including digoxin and some drugs metabolized through CYP3A pathways. Serious dizziness, fainting, palpitations, or reduced urination requires medical evaluation. Patients should seek emergency care for new or worsening chest pain rather than using extra ranolazine doses.

Common Questions About Ranolazine

Is ranolazine the generic form of Ranexa?

Yes. Ranolazine is the active ingredient in Ranexa, and generic extended-release ranolazine tablets are available.

Does ranolazine lower blood pressure?

Ranolazine generally has minimal effects on resting blood pressure and heart rate compared with several other antianginal medications.

Can ranolazine be taken with diltiazem?

Yes, in selected patients, but the ranolazine dose must not exceed 500 mg twice daily when combined with diltiazem or another moderate CYP3A inhibitor.

Can ranolazine be used for sudden chest pain?

No. Ranolazine is intended for ongoing management of chronic angina, not immediate relief of acute chest pain.

References

DailyMed - RANOLAZINE extended-release tablet. https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=0cf58732-c242-49b0-8e3f-248778b4458d. Date Accessed November 3, 2026.

Ranolazine. LiverTox. https://www.ncbi.nlm.nih.gov/books/NBK547932/. Date Accessed November 3, 2026.

Ranolazine. MedlinePlus. https://medlineplus.gov/druginfo/meds/a606015.html. Date Accessed November 3, 2026.

Ranolazine. PubChem. https://pubchem.ncbi.nlm.nih.gov/compound/Ranolazine. Date Accessed November 3, 2026.

Ranolazine. StatPearls. https://www.ncbi.nlm.nih.gov/books/NBK507828/. Date Accessed November 3, 2026.