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    Related terms
    • Brand Names: U.S.: Cardizem®;Cardizem® CD;Cardizem® LA;Cartia XT®;Dilacor XR®;Dilt-CD;Dilt-XR;Diltia XT®;Diltzac;Matzim® LA;Taztia XT®;Tiazac®
    • Brand Names: Canada: Apo-Diltiaz CD®;Apo-Diltiaz SR®;Apo-Diltiaz TZ®;Apo-Diltiaz®;Apo-Diltiaz® Injectable;Ava-Diltiazem;Cardizem® CD;CO Diltiazem CD;CO Diltiazem T;Diltiazem HCl ER®;Diltiazem Hydrochloride Injection;Diltiazem TZ;Diltiazem-CD;Nu-Diltiaz;Nu-Diltiaz-CD;PMS-Diltiazem CD;ratio-Diltiazem CD;Sandoz-Diltiazem CD;Sandoz-Diltiazem T;Teva-Diltiazem;Teva-Diltiazem CD;Teva-Diltiazem HCL ER Capsules;Tiazac®;Tiazac® XC

    • It is used to treat a fast heartbeat.
    • It is used to treat chest pain or pressure.
    • It is used to treat high blood pressure.
    • It is used to treat involuntary body movements.
    • It is used to treat Raynaud's disease.
    • Diltiazem calms blood vessels, lowering blood pressure.


    How to take

    • Follow the diet and workout plan that your doctor told you about.
    • Take as you have been told, even if you are feeling better.
    • There is a liquid (suspension) if you cannot swallow pills. Shake well before use.
    • Those who have feeding tubes may also use the liquid. Flush the feeding tube before and after this drug is given.
    • Fast release:
    • Take 30 minutes before meals and at bedtime.
    • Long-acting products:
    • Swallow whole. Do not chew, break, or crush.
    • Dilacor XR®, Dilt-XR, and Diltia XT®: Take on an empty stomach. Take 1 hour before or 2 hours after meals.
    • Cardizem® CD, Cardizem® LA, Cartia XT®, Dilt-CD, and MatzimT LA: Take with or without food. Take with food if it causes an upset stomach.
    • Tiazac® and Taztia XT®: You may sprinkle contents of capsule on soft food or liquid. Do not chew.
    • Shot:
    • It is given into a vein for a period of time.

    Missed Dose

    • Take a missed dose as soon as you think about it.
    • If it is close to the time for your next dose, skip the missed dose and go back to your normal time.
    • Do not take 2 doses at the same time or extra doses.
    • Do not change the dose or stop this drug. Talk with the doctor.


    • Store at room temperature.
    • Protect capsules and tablets from water. Do not store in a bathroom or kitchen.
    • Store liquid (suspension) at room temperature or in a refrigerator. Do not freeze. Throw away any part not used after 2 months.
    • Protect liquid (suspension) from light.
    • The shot will be given to you in a hospital or doctor's office. You will not store it at home.



    • Sometimes drugs are not safe when you take them with certain other drugs. Taking them together can cause bad side effects. This is one of those drugs. Be sure to talk to your doctor about all the drugs you take.


    • If you have an allergy to diltiazem or any other part of this drug.
    • Tell your doctor if you are allergic to any drugs. Make sure to tell about the allergy and what signs you had. This includes telling about rash; hives; itching; shortness of breath; wheezing; cough; swelling of face, lips, tongue, or throat; or any other signs.
    • If you have any of these health problems: Low blood pressure, poor electrical activity in the heart without a working pacemaker, or very weak heart.


    • Keep a list of all your drugs (prescription, natural products, vitamins, OTC) with you. Give this list to your doctor.
    • Wear disease medical alert ID (identification).
    • Do not run out of this drug.
    • If you have a weak heart, talk with your doctor.
    • Have your blood pressure and heart rate checked often. Talk with your doctor.
    • Check all drugs you are taking with your doctor. This drug may not mix well with some other drugs.
    • If you are taking this drug and have high blood pressure, talk with your doctor before using OTC products that may raise blood pressure. These include cough or cold drugs, diet pills, stimulants, ibuprofen or like products, and some natural products or aids.
    • Avoid grapefruit and grapefruit juice.
    • Limit your drinking of wine, beer, or mixed drinks.
    • Take good care of your teeth. See a dentist often.
    • Tell your doctor if you are pregnant or plan on getting pregnant.
    • Tell your doctor if you are breast-feeding.

    Side Effects

    • Feeling dizzy. Rise slowly over a few minutes when sitting or lying down. Be careful climbing.
    • Headache.
    • Upset stomach or throwing up. Many small meals, good mouth care, sucking hard, sugar-free candy, or chewing sugar-free gum may help.
    • Hard stools (constipation). Drinking more liquids, working out, or adding fiber to your diet may help. Talk with your doctor about a stool softener or laxative.

    Contact a healthcare provider

    • If you think there was an overdose, call your local poison control center or ER right away.
    • Signs of a very bad reaction to the drug. These include wheezing; chest tightness; fever; itching; bad cough; blue or gray skin color; seizures; or swelling of face, lips, tongue, or throat.
    • A fast heartbeat.
    • Very bad dizziness or passing out.
    • Trouble breathing.
    • Very bad headache.
    • Feeling very tired or weak.
    • Any rash.
    • Side effect or health problem is not better or you are feeling worse.

    General Statements

    • If you have a very bad allergy, wear an allergy ID at all times.
    • Do not share your drugs with others and do not take anyone else's drugs.
    • Keep all drugs out of the reach of children and pets.
    • Most drugs may be thrown away in household trash after mixing with coffee grounds or kitty litter and sealing in a plastic bag.
    • In Canada, take any unused drugs to the pharmacy. Also, visit to learn about the right way to get rid of unused drugs.
    • Keep a list of all your drugs (prescription, natural products, vitamins, OTC) with you. Give this list to your doctor.
    • Call your doctor for help with any side effects. If in the U.S., you may also call the FDA at 1-800-FDA-1088 or if in Canada, you may also call Health Canada's Vigilance Program at 1-866-234-2345.
    • Talk with the doctor before starting any new drug, including OTC, natural products, or vitamins.

    Author information
    • Copyright © 1978-2013 Lexi-Comp Inc. All rights reserved.

    Copyright © 2011 Natural Standard (

    The information in this monograph is intended for informational purposes only, and is meant to help users better understand health concerns. Information is based on review of scientific research data, historical practice patterns, and clinical experience. This information should not be interpreted as specific medical advice. Users should consult with a qualified healthcare provider for specific questions regarding therapies, diagnosis and/or health conditions, prior to making therapeutic decisions.

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