Get a Cardizem CD (Diltiazem CD ER) prescription online

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Cardizem CD is a calcium channel blocker that’s used to treat high blood pressure (hypertension). It’s an extended-release capsule, so it’s only taken once or twice a day. This medication helps more oxygen reach  the heart by slowing heart rate and relaxing blood vessels. The generic version is Diltiazem CD ER.

Please note: At this time, this medication is only prescribed as a refill at Dr. B.

* Prescription treatment requires a virtual medical consultation with a medical provider to determine if a prescription is appropriate.

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How Dr. B treats high blood pressure

Health assessment

Tell us about your condition with a $15 online consultation—no video call necessary.

Provider review

A medical provider will review your information and prescribe treatment, if appropriate.

Get your medication

Pick up and pay for the medication at the pharmacy of your choice. Or, get it delivered.

About Cardizem CD (Diltiazem CD ER)

How does it work?

Cardizem CD is from a class of drugs known as calcium channel blockers. It relaxes blood vessels and slows your heart rate. This helps more oxygen reach your heart so it doesn’t have to work as hard.

What does it treat?

This medication is used to treat high blood pressure (hypertension). It’s also sometimes used to help regulate abnormal heart rhythms. Controlling blood pressure can lower the risk of complications like heart attack, stroke or kidney problems.

What forms does it come in?

Cardizem CD is an extended-release capsule that’s taken by mouth. These capsules release the medication slowly over time, allowing for consistent blood pressure control.

Cardizem CD vs. Diltiazem CD ER

Cardizem CD and Diltiazem CD ER are essentially the same medication. Cardizem CD is a brand name, while Diltiazem CD ER is the generic version. Both work to relax blood vessels and lower blood pressure.

How much will it cost?

Dr. B offers online consultations for $15—which is less than most copays. If a high blood pressure prescription is appropriate, your out-of-pocket medication cost will depend on your insurance and where you decide to get your prescription filled. With a drug discount card, prices for Diltiazem CD-ER 24 hr 120 mg (30 capsules) start at $2.51.

* Prices shown with drug discount card applied. Price may differ depending on location.

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Starting at

Diltiazem CD-ER 24 hr 120 mg (30 capsules)*

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Common Questions

Cardizem CD (Diltiazem CD ER) prescription FAQ

What are the benefits of taking Cardizem CD (Diltiazem CD ER)?
  • Lowers blood pressure
  • Regulates heart rhythm
  • Improves heart function
  • Improves blood flow to heart
  • Reduces risk of heart-related complications
  • Protects kidney function
Who should not take this medication?
  • Those who are allergic to Diltiazem
  • People with a known allergy or severe reaction to Calcium Channel Blockers (CCBs)
  • Pregnant women, breastfeeding or those planning to become pregnant
  • Those with a history of liver problems
  • People with severe heart conditions or heart failure
  • People who have slow heart rate (bradycardia)
  • Those with low blood pressure (hypotension)
  • Those with myasthenia gravis (muscle disorder)
  • People with sick sinus syndrome (a heart rhythm problem)
  • Those who have second- or third-degree atrioventricular block (a heart rhythm problem)

If you have any of these conditions—or Raynaud's syndrome (a condition that causes the fingers and toes to become numb and cold), asthma, other respiratory issues, a history of significant lung diseases, porphyria (a rare blood disorder), kidney complications, or diabetes—speak with your healthcare provider before starting this medication.

Taking this medication when you have these conditions should be carefully and closely monitored by a healthcare provider.

Also tell your medical provider about any other medications you’re using before you start this hypertension treatment.

How do you take this medication?

Take this hypertension medication by mouth with or without food, usually once daily. Do not crush, chew or break the capsules. This could affect how the medicine works in your body.

High blood pressure is a long-term (chronic) condition that can harm your organs. Medications for blood pressure are not a one-time cure. This medicine doesn't provide a complete cure for high blood pressure, so it's important to continue taking it, even if you start feeling better. If you stop taking it suddenly, this could cause dangerous problems, like heart attack or stroke. Follow your medical provider's instructions carefully.

What happens if I miss a dose?

If you miss a dose of your hypertension pill, take it as soon as you remember. Just don’t double the dose – if it’s almost time for the next dose, skip the missed dose.

What happens if I take too much?

Taking too much of your blood pressure medicine can lead to symptoms like low blood pressure, hyperglycemia (high blood sugar), slow heart rate, dizziness and fainting.

If you’ve taken too much Cardizem CD, call your healthcare provider or local poison control center (800-222-1222) immediately.

Can I get Cardizem CD (Diltiazem CD ER) online?

Yes! Start by completing a Dr. B virtual consultation. A licensed medical provider will review your health history and, if appropriate, send a refill to your preferred pharmacy.

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Side Effects

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Let your health provider know if your side effects bother you or if you have any questions about your treatment. The most common side effects are:

  • Headache
  • Swelling of arms, legs, hands or feet
  • Dizziness or lightheadedness
  • Stomach upset
  • Sore throat
  • Shortness of breath

Talk to your health provider if you experience severe side effects like trouble breathing, chest pain or tightness, flu-like symptoms, yellowing skin or eyes or peeling skin.

Don’t drive until you know how this medicine affects you. Be extra careful in the first hours after taking your pill because of the risk of dizziness or lightheadedness.

Getting your blood tested regularly is important to monitor your overall health. It's a good idea to have your bloodwork checked, which may include tests for renal function, glucose levels or potassium levels in your blood. These routine checks help ensure you are in good health and catch any potential issues early.