Gas-X Products for Gas and Upset Stomach

Medically Reviewed by Ami Ishver, PharmD on October 09, 2025
2 min read

Gas-X products are used to treat fullness, pressure, or bloating from gas. All Gas-X products contain simethicone as the main active ingredient. Simethicone reduces symptoms from gas by helping small gas bubbles come together. This allows gas to pass more easily through your gastrointestinal (GI) tract.

Gas-X Total Relief contains an antacid, calcium carbonate, in addition to simethicone. Calcium carbonate helps neutralize the acid in your stomach. This helps reduce indigestion, heartburn, or sour or upset stomach.

There are Gas-X products for adults and children as young as 12 years old.

Gas-X products are usually well-tolerated. Some people may have diarrhea or constipation.

Stop using the medicine if you develop a rash or hives. Get medical help right away if you have signs of a serious allergic reaction, such as trouble breathing or swelling of the face, lips, or throat.

Talk to your health care provider if you are pregnant or breastfeeding before taking Gas-X.

Gas-X Total Relief may interact with other medicines. Before taking Gas-X Total Relief, tell your health care provider about any prescription or over-the-counter (OTC) medicines, vitamins/minerals, herbal products, and other supplements you are using. You should not take Gas-X Total Relief for longer than two weeks unless your health care provider tells you to do so. If you are still having symptoms after taking it regularly for two weeks, contact your health care provider.

There may be side effects, additional warnings, and interactions with other medicines that are not listed here. These may vary depending on the combination of ingredients in the specific Gas-X product you are using. Always check the label before taking any over-the-counter medicine. Do not take more than the recommended dose. Talk to your doctor or pharmacist about your health conditions and other medicines to help determine which products are safe for you.

You can choose a Gas-X product based on how strong you need the gas relief to be or if you also need relief for an upset stomach. Gas-X comes in softgels, chews, or chewable tablets. All products may be used in people 12 years or older.

For gas relief only (fullness, pressure, or bloating)

ProductIngredients
Gas-X Ultimate Strength SoftgelsSimethicone 500 mg
Gas-X Maximum Strength SoftgelsSimethicone 250 mg
Gas-X Ultra Strength SoftgelsSimethicone 180 mg
Gas-X Extra Strength Softgels or Chewable TabletsSimethicone 125 mg

For gas and upset stomach

ProductIngredients
Gas-X Total Relief Chews

Simethicone 250 mg

Calcium Carbonate 750 mg