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Mi-Acid Double Strength

Generic name: calcium carbonate and magnesium hydroxideKAL-see-um-KAR-bo-nate-and-mag-NEE-zee-um-hye-DROX-ide ]
Brand names: Rolaids, Rolaids Ultra Strength, Mi-Acid Double Strength, Mylanta Supreme
Drug class: Antacids

Medically reviewed by on Dec 22, 2023. Written by Cerner Multum.

What is Mi-Acid Double Strength?

Mi-Acid Double Strength is a combination antacid used to treat indigestion, upset stomach, and heartburn.

Mi-Acid Double Strength may also be used for purposes not listed in this medication guide.

Mi-Acid Double Strength 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.

Stop using Mi-Acid Double Strength and call your doctor at once if you have symptoms of high calcium or magnesium levels in your blood:

Common side effects of Mi-Acid Double Strength may include:

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.


Follow all directions on the label and package. Use exactly as directed.

Before taking this medicine

Ask a doctor or pharmacist before using Mi-Acid Double Strength if you have health problems or use other medications.

Ask a doctor before using this medicine if you are pregnant or breastfeeding.

Do not give this medicine to a child without medical advice.

How should I use Mi-Acid Double Strength?

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

You must chew the chewable tablet before you swallow it.

Do not use Mi-Acid Double Strength for longer than 14 days in a row without medical advice. Do not use more than 7 tablets in a 24-hour period.

Store at room temperature away from moisture and heat.

What happens if I miss a dose?

Mi-Acid Double Strength is used when needed and does not have a daily dosing schedule.

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 using Mi-Acid Double Strength?

Avoid taking other medications at the same time you use an antacid. Some antacids can make it harder for your body to absorb other medicines you take by mouth.

What other drugs will affect Mi-Acid Double Strength?

Ask a doctor or pharmacist before using Mi-Acid Double Strength with any other medicines, especially:

This list is not complete and many other drugs may affect Mi-Acid Double Strength. This includes prescription and over-the-counter medicines, vitamins, and herbal products. Not all possible drug interactions are listed here.

More about Mi-Acid Double Strength (calcium carbonate / magnesium hydroxide)

Patient resources

Other brands

Rolaids Regular Strength, Rolaids Ultra Strength, Masanti Supreme, Mylanta Supreme, Mylanta Ultra

Other formulations

Related treatment guides

Further information

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.

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.