Patient Education

Health Library

Our Health Library information does not replace the advice of a doctor. Please be advised that this information is made available to assist our patients to learn more about their health. Our providers may not see and/or treat all topics found herein.

calcium carbonate and magnesium chloride

Skip to the navigation

Pronunciation: KAL see um KAR boe nate and mag NEE see um KLOR ide

Brand: Mag64, MagDelay, Slow-Mag

What is the most important information I should know about calcium carbonate and magnesium chloride?

Follow all directions on your medicine label and package. Tell each of your healthcare providers about all your medical conditions, allergies, and all medicines you use.

What is calcium carbonate and magnesium chloride?

Calcium and magnesium are naturally occurring minerals that are necessary for many systems in the body.

Calcium is needed for bone formation and maintenance. Magnesium helps maintain muscle function and normal heart rhythm.

Calcium carbonate and magnesium chloride is a combination medicine used as a supplement. This medicine is given when your diet does not provide enough of these minerals, or when they are lost through perspiration.

Calcium carbonate and magnesium chloride may also be used for purposes not listed in this medication guide.

What should I discuss with my healthcare provider before taking calcium carbonate and magnesium chloride?

You should not use this medicine if you have ever had an allergic reaction to an antacid or vitamin/mineral supplement that contains calcium carbonate or magnesium chloride.

Ask a doctor or pharmacist if it is safe for you to use this medicine if you have other medical conditions, especially:

  • kidney disease;
  • history of kidney stones;
  • heart disease; or
  • a blockage in your intestines.

Ask a doctor before using this medicine if you are pregnant or breast-feeding. Your dose needs may be different during pregnancy or while you are nursing.

Your dose needs may be different during pregnancy or while you are nursing.

How should I take calcium carbonate and magnesium chloride?

Use exactly as directed on the label, or as prescribed by your doctor. Do not use in larger or smaller amounts or for longer than recommended.

Do not crush, chew, or break a delayed-release or an enteric coated tablet. Swallow it whole. The enteric coated pill has a special coating to protect your stomach. Breaking the pill will damage this coating.

Store at room temperature away from moisture and heat.

What happens if I miss a dose?

Since calcium carbonate and magnesium chloride is used when needed, you may not be on a dosing schedule. If you are on a schedule, use the missed dose as soon as you remember. Skip the missed dose if it is almost time for your next scheduled dose. Do not use extra medicine to make up the missed dose.

What happens if I overdose?

Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.

What should I avoid while taking calcium carbonate and magnesium chloride?

Avoid taking other medicines at the same time you take calcium carbonate and magnesium chloride. Calcium carbonate can make it harder for your body to absorb certain drugs, making them less effective. Take your other medicines at least 2 hours before or 2 hours after you take calcium carbonate and magnesium chloride.

What are the possible side effects of calcium carbonate and magnesium chloride?

Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.

Stop using calcium carbonate and magnesium chloride and call your doctor at once if you have:

  • nausea, vomiting, stomach pain, loss of appetite, increased thirst or urination;
  • muscle pain or weakness, joint pain;
  • confusion, feeling tired or restless; or
  • slow heart rate, drowsiness, feeling light-headed.

Common side effects may include:

  • diarrhea;
  • constipation; or
  • upset stomach.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

What other drugs will affect calcium carbonate and magnesium chloride?

Tell your doctor about all your current medicines and any you start or stop using, especially:

  • an antibiotic;
  • heart or blood pressure medicine; or
  • medicine to treat osteoporosis or Paget's disease of bone--Actonel, Boniva, Fosamax, Reclast, Zometa, and others.

This list is not complete. Other drugs may interact with calcium carbonate and magnesium chloride, including prescription and over-the-counter medicines, vitamins, and herbal products. Not all possible interactions are listed in this medication guide.

Where can I get more information?

Your pharmacist can provide more information about calcium carbonate and magnesium chloride.


Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed.

Every effort has been made to ensure that the information provided by Cerner Multum, Inc. ('Multum') is accurate, up-to-date, and complete, but no guarantee is made to that effect. Drug information contained herein may be time sensitive. Multum information has been compiled for use by healthcare practitioners and consumers in the United States and therefore Multum does not warrant that uses outside of the United States are appropriate, unless specifically indicated otherwise. Multum's drug information does not endorse drugs, diagnose patients or recommend therapy. Multum's drug information is an informational resource designed to assist licensed healthcare practitioners in caring for their patients and/or to serve consumers viewing this service as a supplement to, and not a substitute for, the expertise, skill, knowledge and judgment of healthcare practitioners. The absence of a warning for a given drug or drug combination in no way should be construed to indicate that the drug or drug combination is safe, effective or appropriate for any given patient. Multum does not assume any responsibility for any aspect of healthcare administered with the aid of information Multum provides. The information contained herein is not intended to cover all possible uses, directions, precautions, warnings, drug interactions, allergic reactions, or adverse effects. If you have questions about the drugs you are taking, check with your doctor, nurse or pharmacist.

Copyright 1996-2017 Cerner Multum, Inc. Version: 2.02. Revision date: 12/9/2016.

Your use of the content provided in this service indicates that you have read, understood and agree to the End-User License Agreement, which can be accessed by clicking on this link.

This information does not replace the advice of a doctor. Healthwise, Incorporated disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Terms of Use and Privacy Policy. Learn how we develop our content.

Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.