Active Ingredient

Diltiazem

Diltiazem is a medication used to manage certain heart conditions and high blood pressure. It helps improve blood flow and reduce the workload on the heart.

This medication can be beneficial for individuals experiencing chest pain or those with certain types of irregular heartbeats.

Written By Douglas C. Goldberg, MD

Reviewed By Philip Schein, MD

Last Updated 28 Nov 2025

Available Diltiazem Brands

Cardizem

Strengths 30 mg, 60mg, 90 mg, 120mg, 180mg

Diltiazem

Strengths 60mg, 180mg

Diltiazem HCL

Strengths 60 mg, 120 mg, 180 mg

Diltiazem Uses

Diltiazem is commonly prescribed for various cardiovascular conditions. It is important to use this medication under the guidance of a healthcare professional.

High blood pressure (hypertension)
Chest pain (angina)
Certain types of irregular heartbeat (arrhythmias)
Prevention of heart attack complications

How Diltiazem Works

Diltiazem works by blocking calcium channels in the heart and blood vessels. This action helps to relax the blood vessels, allowing blood to flow more easily.

By reducing the heart’s workload and lowering blood pressure, it helps prevent chest pain and improves the efficiency of the heart.

As a calcium channel blocker, it is effective in managing specific heart conditions and providing relief from symptoms.

Common side effects of Diltiazem

Not everyone experiences side effects with Diltiazem, and many are mild and temporary. However, it is important to be aware of potential side effects.

Dizziness
Headache
Flushing
Fatigue
Stomach upset
Swelling in hands or feet
Constipation

If you experience any severe or persistent symptoms, contact your doctor promptly.

Monitor your blood pressure regularly while taking Diltiazem.
Avoid consuming large amounts of alcohol as it can increase the risk of side effects.
Inform your doctor about any other medications you are taking to prevent potential interactions.
Do not stop taking this medication suddenly without consulting your healthcare provider.
Report any unusual symptoms such as swelling or difficulty breathing to your doctor immediately.

Always consult your doctor for personalized advice and guidance.

Frequently Asked Questions

What does Diltiazem do for the heart?

Diltiazem helps relax blood vessels and reduce the heart’s workload, improving blood flow and lowering blood pressure.

How long does it take for Diltiazem to work?

The effects of Diltiazem can be felt within a few hours, but it may take a few weeks to see the full benefits.

Can I drink alcohol while taking Diltiazem?

It’s advisable to limit alcohol consumption as it can increase the risk of side effects when taking Diltiazem.

Are there any foods I should avoid while taking Diltiazem?

Grapefruit and grapefruit juice may interact with Diltiazem and should be avoided unless advised otherwise by your doctor.

Is Diltiazem safe for long-term use?

Diltiazem is generally considered safe for long-term use under medical supervision. Regular check-ups are recommended.