Mylanta for the Treatment of Heartburn and Peptic Ulcer

Mylanta liquid

Verywell / Anastasia Tretiak

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Mylanta is a brand of nonprescription antacid with several formulations. It may contain aluminum hydroxide and magnesium hydroxide or calcium carbonate. These antacids may be used to help with symptoms of heartburn, indigestion, and stomach upset. Mylanta gas preparations contain simethicone, which can be helpful in treating intestinal gas.

How It Works

Mylanta antacids may be used to treat the symptoms of conditions including gastritis, hiatal hernia, and peptic ulcer. They are also used to treat symptoms of gastroesophageal reflux disease (GERD).

The aluminum hydroxide and magnesium hydroxide in Mylanta, as well as calcium carbonate in some preparations, work by reducing acid in the stomach.

Product Details and Preparations

The Mylanta product line changes over the years and it is important that you read the product labeling and instructions carefully so you understand which product you are using. You may have older products in your home that differ from the currently available formulations.

  • Mylanta Maximum Strength Liquid Antacid/Anti-Gas has active ingredients of aluminum hydroxide, magnesium hydroxide, and simethicone. It may be used for heartburn, acid indigestion, and gas. It comes in a couple of flavors.
  • Mylanta Tonight Liquid Antacid/Anti-Gas has active ingredients of calcium carbonate, magnesium hydroxide, and simethicone. It is made in a honey chamomile flavor that you may find soothing but it does not produce drowsiness. It is used for heartburn, acid indigestion, and gas.
  • Mylanta Gas Minis are chewable tablets in fruit or mint flavors with the active ingredient of simethicone. They are used to relieve gas.

Previously marketed formulations had various combinations of aluminum hydroxide, magnesium hydroxide, calcium carbonate, and simethicone. They included liquids, tablets, gel caps, chewable tablets, and chewable softgels, including some labeled for children.

Using Mylanta Products

Mylanta liquids should be shaken well before each use to mix the medicine evenly. To reduce the chalky taste, you can mix the liquid with water or milk. Be sure to note how much you should take based on age and don't exceed the maximum dose per day. The products come with a dosing cup that should be cleaned with warm water and mild dish soap after each use.

Chewable tablets should be chewed slowly and thoroughly. They are less effective if swallowed whole. Drink a full glass of water after taking the tablets.

Follow the directions on the package label or on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand. Take aluminum hydroxide and magnesium hydroxide antacids exactly as directed. Do not take more or less of it or take it more often than prescribed by your doctor.

Do not take antacids for more than one to two weeks unless prescribed by your doctor.

Mylanta is designed to be used for the short-term control of minor symptoms. If your symptoms persist or worsen make sure to see your doctor. This medication should only be used for an extended period of time under the careful guidance of a physician.


Before taking Mylanta:

  • Tell your doctor and pharmacist if you are allergic to aluminum hydroxide and magnesium hydroxide antacids, and also any other allergies you have. There may be inactive ingredients in products that you are allergic to in addition to the active ingredients.
  • If you are on a magnesium-restricted diet, discuss the use of Mylanta antacid products with your doctor as the antacid formulations usually contain magnesium.
  • When using antacid products, tell your doctor and pharmacist what prescription and nonprescription medications you are taking, especially aspirin, Lanoxin (digoxin), Valium (diazepam), Diflucan (fluconazole), Didronel (etirdronate), Dilantin (phenytoin), tetracycline antibiotics, and vitamins. Your doctor will be able to tell you whether you can take antacids with these medications, and if so, whether you can do so at the same time, or take the medications at a different time. For example, you may need to delay taking other medications for two hours after taking an antacid. Calcium may decrease the effectiveness of other medications.
  • Tell your doctor if you have or have ever had stomach problems or kidney disease.
  • Tell your doctor if you are pregnant, plan to become pregnant, or are breastfeeding. If you become pregnant while taking aluminum hydroxide and magnesium hydroxide antacids, call your doctor.
  • Check the ingredients on other medications you are taking. Other medications may contain the same ingredients, and using both products may result in an excess dose.

Possible Side Effects

Although side effects from aluminum hydroxide, magnesium hydroxide or calcium carbonate in Mylanta are not common, they can occur. Simethicone does not usually cause side effects. Tell your doctor if any of these symptoms are severe or do not go away:

  • Upset stomach
  • Vomiting
  • Stomach pain
  • Belching
  • Constipation or diarrhea
  • Dry mouth
  • Increased urination
  • Loss of appetite
  • Metallic taste
  • Unusual tiredness
  • Muscle weakness

A Word From Verywell

The occasional use of antacids can help give you symptom relief, but these products don't treat the underlying causes of your discomfort. But if you find yourself needing to use them regularly for heartburn or indigestion you should see your doctor. Conditions with these symptoms, such as gastroesophageal reflux disease (GERD), can have serious complications when not treated effectively. Your doctor can advise you on more effective treatment.

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Article Sources
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  1. Infirst Healthcare, Inc. Mylanta Maximum Strength Liquid Antacid/Anti-Gas.

  2. Infirst Healthcare, Inc. Mylanta Tonight Liquid Antacid/Anti-Gas.

  3. Infirst Healthcare, Inc. Mylanta Gas Minis.

Additional Reading
  • MedlinePlus, National Institutes of Health U.S. National Library of Medicine. Aluminum Hydroxide and Magnesium Hydroxide. Revised May 15, 2019.

  • MedlinePlus, National Institutes of Health U.S. National Library of Medicine. Calcium Carbonate. Revised September 15, 2015.

  • MedlinePlus, National Institutes of Health U.S. National Library of Medicine. Simethicone. Revised February 15, 2018.