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MagDelay

Generic name: calcium carbonate and magnesium chloride

Brand names: Mag64, MagDelay, Magnesium Chloride With Calcium, Nu-Mag, Slow Magnesium Chloride with Calcium, Slow-Mag, SlowMag Muscle + Heart

Last updated November 2, 2026 0 views
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What is MagDelay?

Calcium and magnesium are minerals that occur naturally. Calcium is important for building and keeping bones healthy. Magnesium helps with muscle function and keeping the heart beating normally.

MagDelay is a combination medicine that serves as a supplement. MagDelay is taken when your diet does not give you enough of these minerals, or when they are lost through sweating.

MagDelay may also be used for reasons not mentioned in this medication guide.

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How should I take MagDelay?

Use exactly as directed on the label, or as prescribed by your doctor.

Swallow the tablet whole and do not crush, chew, or break it.

Store at room temperature away from moisture and heat.

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Warnings

Follow all instructions on your medicine label and package. Inform each of your healthcare providers about all your medical conditions, allergies, and all medicines you are taking.

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Before taking this medicine

You should not use MagDelay 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 this medicine is safe to use if you have:

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

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

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MagDelay side effects

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

MagDelay may cause serious side effects. Stop using MagDelay and call your doctor right away 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 of MagDelay 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.

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What happens if I miss a dose?

Since MagDelay is used as needed, you might not have a dosing schedule. If you miss a dose and it's almost time for your next dose, skip the missed dose. Do not take two doses at the same time.

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What happens if I overdose?

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

Avoid taking other medicines at the same time you take MagDelay.

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What other drugs will affect MagDelay?

Calcium carbonate can make it harder for your body to absorb some medications, which can reduce their effectiveness. If you take other medicines, take your MagDelay dose 2 hours before or 2 hours after taking those medicines.

Tell your doctor about all your other medications, especially:

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

This list is not complete. Other drugs may affect MagDelay, including prescription and over-the-counter medicines, vitamins, and herbal products. Not all possible drug interactions are listed here.

This section was rewritten for readability and reviewed for meaning.

Related medicines

Before you take this medicine: the information on this page is general and may not cover your personal circumstances. Read the label supplied with your medicine and ask a pharmacist or doctor if you are unsure, especially if you are pregnant, breastfeeding, taking other medicines or managing a long-term condition.
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Content is provided for education and is not medical advice. See our medical disclaimer.