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What Is Ranexa?

Ranexa is a prescription medication containing ranolazine, an antianginal drug used to treat chronic angina in adults. Chronic angina causes recurring chest discomfort when the heart muscle does not receive enough oxygen-rich blood, commonly during physical activity or emotional stress. Ranexa is available as extended-release oral tablets and may be prescribed alongside beta blockers, calcium channel blockers, nitrates, and other cardiovascular medications. It reduces angina symptoms without producing the same substantial reductions in heart rate or blood pressure associated with some other treatments. Ranexa is not intended to provide immediate relief during an acute episode of chest pain.

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What Is Ranexa?

Ranexa is a prescription medication containing ranolazine, an antianginal drug used to treat chronic angina in adults. Chronic angina causes recurring chest discomfort when the heart muscle does not receive enough oxygen-rich blood, commonly during physical activity or emotional stress. Ranexa is available as extended-release oral tablets and may be prescribed alongside beta blockers, calcium channel blockers, nitrates, and other cardiovascular medications. It reduces angina symptoms without producing the same substantial reductions in heart rate or blood pressure associated with some other treatments. Ranexa is not intended to provide immediate relief during an acute episode of chest pain.

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How Does Ranexa Work?

Ranexa contains ranolazine, which is believed to reduce the late inward sodium current in heart muscle cells. Excessive late sodium entry can contribute to increased intracellular calcium and impaired relaxation of the heart muscle during periods of reduced oxygen supply. By reducing this activity, ranolazine may improve cardiac relaxation and reduce symptoms of chronic angina. Its exact antianginal mechanism has not been fully established. Ranexa has relatively small effects on resting heart rate and blood pressure. It can also affect cardiac electrical activity by prolonging the QT interval, which requires consideration of individual risk factors and medication interactions.

What Condition Does Ranexa Treat?

Ranexa is approved for chronic angina, a condition involving recurring chest pain or pressure associated with insufficient blood flow to the heart muscle. It may be prescribed when symptoms persist despite other antianginal treatments or when a clinician determines that its mechanism is appropriate. Ranexa can be used with beta blockers, nitrates, calcium channel blockers, antiplatelet drugs, and certain cholesterol or blood pressure medications. It does not treat an acute heart attack or provide rapid relief during sudden chest pain. Patients with new, severe, or worsening chest discomfort need prompt medical evaluation to rule out an acute cardiovascular emergency.

How Should Ranexa Be Taken?

Ranexa is taken orally twice daily, with or without food. The usual starting dose is 500 mg twice daily, which may be increased to 1,000 mg twice daily according to symptom control and tolerability. Extended-release tablets must be swallowed whole without crushing, breaking, or chewing. Patients taking moderate CYP3A inhibitors, such as diltiazem or verapamil, should not exceed 500 mg twice daily. Ranexa must not be combined with strong CYP3A inhibitors or inducers and is contraindicated in patients with liver cirrhosis. Kidney function may require monitoring during treatment. Missed doses should be skipped rather than doubled.

What Are the Side Effects and Warnings of Ranexa?

Common adverse effects include dizziness, headache, constipation, and nausea. Ranexa can prolong the QT interval, which may increase concern in patients with certain heart rhythm conditions or those taking other QT-prolonging medications. Serious kidney complications have been reported in patients with severe kidney impairment, requiring appropriate monitoring. Ranolazine also interacts with several medications, including certain antibiotics, antifungals, cardiovascular drugs, and other treatments metabolized through CYP3A pathways. Patients should report fainting, severe dizziness, new palpitations, or significant changes in urination. Any new or worsening chest pain requires medical evaluation rather than simply increasing the dose.

Common Questions About Ranexa

Is Ranexa the same as ranolazine?

Yes. Ranexa is a brand name for ranolazine, a medication used to treat chronic angina. Generic extended-release ranolazine tablets are also available.

Can Ranexa stop a heart attack?

No. Ranexa treats chronic angina and is not an emergency medication for a heart attack or sudden severe chest pain.

How often is Ranexa taken?

Ranexa is usually taken twice daily. Treatment generally starts at 500 mg twice daily, with a maximum recommended dose of 1,000 mg twice daily.

Can Ranexa affect heart rhythm?

Yes. Ranexa can prolong the QT interval. Patients should discuss existing heart rhythm conditions and interacting medications with their clinician.

References

DailyMed - RANEXA (ranolazine) extended-release tablet. https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=8d442b8c-97a8-40a9-8603-f9cd0542cedc. 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.