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Generic Name: Calcium carbonate and magnesium chloride [KAL-see-um-KAR-boe-nate-and-mag-NEE-see-um-KLOR-ide].
Names of Brands: Mag64, MagDelay Magnesium Chloride with Calcium Nu-Mag, Slow Magnesium Chloride containing Calcium, Slow-Mag SlowMag Muscle + Heart.
Classification of Drugs: Minerals and electrolytes.

What is MagDelay?

Calcium and magnesium are naturally occurring minerals found in nature. Calcium is essential to build bone and maintain it. Magnesium aids in maintaining the function of muscles and a normal heart rhythm.

MagDelay is a combination medication that is used as a supplement. MagDelay is prescribed in the event that your diet doesn't supply enough minerals or if they are depleted through sweat. MagDelay could be used for other purposes not covered in this medication guide.

Adverse effects of MagDelay

See a doctor immediately. If you are experiencing symptoms that are warning signs of an allergic response, like hives, trouble breathing, or swelling of your lips, face, and throat. MagDelay could cause severe adverse consequences. Do not use MagDelay and contact your doctor immediately if you experience:

  • Nausea, vomiting, stomach discomfort, loss of appetite, and increased thirst or urination.
  • Muscle discomfort and weakness; joint pain.
  • Feelings of confusion, fatigue, or agitation.
  • Low heartbeat, drowsiness, and feeling lightheaded.

Common adverse effects of MagDelay can include:

  • Diarrhea.
  • Constipation.
  • Upset stomach.

This isn't a complete list of all the side effects. Other effects may also be present. Consult your physician to seek medical advice on the effects. You can report adverse reactions to the FDA at 1-800-FDA-1088.


Follow the instructions on the label of your medication and the package. Inform your healthcare professionals about your allergies, medical conditions, and all medications you take.

Before you take this drug

It is not recommended to use MagDelay if you've ever suffered an allergic reaction to an antacid or vitamin or mineral product that contains magnesium carbonate or magnesium chloride.

Ask your doctor or pharmacist for a recommendation on whether this medication is safe to use if you are suffering from:

  • Kidney disease.
  • A background that includes kidney stones.
  • Heart disease.
  • A blockage inside your digestive tract.

Consult a physician prior to using this medicine if you are nursing or pregnant. Your dose needs might differ when you are pregnant or breastfeeding.

How to take MagDelay?

Use only as indicated on the label or as recommended by your doctor. Suck the tablet completely and make sure you don't crush, chew, or break it. Keep at room temperature and away from heat and moisture.

What happens if I miss a dose?

MagDelay is only used for emergencies, and you might not be following a regular dosing regimen. Do not miss any doses in the event that it's nearing time for the next dose. Don't take two doses at once.

What happens if I overdose?

For medical emergencies, seek emergency medical attention or contact the Poison Help line toll-free at 1-800-222-1222.

What should be avoided?

Beware of taking other medications in the same way you are taking MagDelay.

Interaction with other drugs

Calcium carbonate may make it more difficult for the body to absorb certain medications and make them less efficient. If you're taking other medicines, then make sure to take your MagDelay dose two hours prior to or two hours after you have taken your other medication.

Discuss with your doctor any additional medications you are taking, especially:

  • As an antibiotic.
  • Blood pressure or heart medicine.
  • Treatment for osteoporosis or Paget's bone disease—Actonel, Boniva, Fosamax, Reclast Zometa, among others.

This list isn't complete. Other drugs can also influence MagDelay, such as prescription and over-the-counter medicines, vitamins, and herbal products. There are many possible interactions between drugs that are listed here.