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calcium carbonate and magnesium hydroxide

Pronunciation: KAL see um KAR boe nate and mag NEE zee um hye DROX ide

Brand: Mi-Acid Double Strength, Mylanta Gelcap, Mylanta Supreme, Mylanta Ultra, Rolaids, Rolaids Extra Strength

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

Multum donot

You should not use this medication if you have ever had an allergic reaction to an antacid.

Ask a doctor or pharmacist before taking this medicine if you have kidney disease.

Follow the instructions on the medicine label. Do not use the medication in larger amounts or more often than recommended.

Multum donot

Do not take calcium carbonate and magnesium hydroxide for longer than 14 days in a row without medical advice. Talk with your doctor if your symptoms do not improve, or if they get worse after 2 weeks of treatment.

There are many other drugs that can interact with calcium carbonate and magnesium hydroxide. Ask a doctor or pharmacist if it is safe for you to use this medication if you are also taking an antibiotic, heart or blood pressure medication, or medicine to treat osteoporosis or Paget's disease of bone.

Multum donot

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

What is calcium carbonate and magnesium hydroxide?

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

The combination of calcium carbonate and magnesium hydroxide is used as an antacid to relieve indigestion, upset stomach, and heartburn.

Calcium carbonate and magnesium hydroxide 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 hydroxide?

Multum donot

You should not use this medication if you have ever had an allergic reaction to an antacid.

Ask a doctor or pharmacist if it is safe for you to take this medicine if you have kidney disease.

Multum nopreg

FDA pregnancy category C. It is not known whether this medication will harm an unborn baby. Do not use calcium carbonate and magnesium hydroxide without medical advice if you are pregnant.

Multum nobrfeed

It is not known whether calcium carbonate and magnesium hydroxide passes into breast milk or if it could harm a nursing baby. Do not use this medication without telling your doctor if you are breast-feeding a baby.

How should I take calcium carbonate and magnesium hydroxide?

Use exactly as directed on the label, or as prescribed by your doctor. This medication is usually taken between meals or at bedtime. Follow the instructions on the medicine label. Do not use the medication in larger amounts or more often than recommended.

The chewable tablet must be chewed before you swallow it.

Multum shake

Shake the oral suspension (liquid) well just before you measure a dose. Measure the liquid with a special dose-measuring spoon or medicine cup, not with a regular table spoon. If you do not have a dose-measuring device, ask your pharmacist for one.

Multum donot

Do not take this medication for longer than 14 days in a row without medical advice. Talk with your doctor if your symptoms do not improve, or if they get worse after 2 weeks of treatment.

Multum rt

Store at room temperature away from moisture and heat. Do not allow the liquid form of this medicine to freeze.

What happens if I miss a dose?

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

What happens if I overdose?

Multum emt

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

Overdose symptoms may include severe forms of some of the side effects listed in this medication guide.

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

Multum donot

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

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

Multum emt

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

Multum donot

Stop using calcium carbonate and magnesium hydroxide and call your doctor at once if you have a serious side effect such as:

  • 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.

Less serious 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 hydroxide?

Ask a doctor or pharmacist if it is safe for you to use calcium carbonate and magnesium hydroxide if you are also using any of the following drugs:

  • digoxin (Lanoxin, Lanoxicaps);
  • an antibiotic such as cefdinir (Omnicef), cefprozil (Cefzil), cefuroxime (Ceftin), cephalexin (Keflex), and others;
  • an antibiotic such as ciprofloxacin (Cipro), gemifloxacin (Factive), levofloxacin (Levaquin), moxifloxacin (Avelox), ofloxacin (Floxin), norfloxacin (Noroxin), and others;
  • an antibiotic such as doxycycline (Doryx, Oracea, Periostat, Vibramycin), minocycline (Dynacin, Minocin, Solodyn), or tetracycline (Ala-Tet, Brodspec, Panmycin, Sumycin, Tetracap);
  • heart or blood pressure medication such as amlodipine (Norvasc, Caduet, Exforge, Lotrel, Tekamlo, Tribenzor, Twynsta, Amturnide), diltiazem (Cardizem, Cartia, Dilacor, Diltia, Diltzac, Taztia, Tiazac), nifedipine (Nifedical, Procardia), verapamil (Calan, Covera, Isoptin, Verelan, Tarka), and others;
  • heart or blood pressure medication such as atenolol (Tenormin, Tenoretic), carvedilol (Coreg), labetalol (Normodyne, Trandate), metoprolol (Dutoprol, Lopressor, Toprol), nadolol (Corgard), nebivolol (Bystolic), propranolol (Inderal, InnoPran), sotalol (Betapace), and others; or
  • medication to treat osteoporosis or Paget's disease of bone, such as alendronate (Fosamax), etidronate (Didronel), ibandronate (Boniva), pamidronate (Aredia), risedronate (Actonel, Atelvia), tiludronate (Skelid), or zoledronic acid (Zometa, Reclast).

This list is not complete and there are many other drugs that can interact with calcium carbonate and magnesium hydroxide. Tell your doctor about all medications you use. This includes prescription, over-the-counter, vitamin, and herbal products. Do not start a new medication without telling your doctor. Keep a list of all your medicines and show it to any healthcare provider who treats you.

Where can I get more information?

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


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.

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