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Gas-X with Maalox Extra Strength Side Effects

Generic name: calcium carbonate / simethicone

Medically reviewed by Last updated on Dec 12, 2023.

Note: This document contains side effect information about calcium carbonate / simethicone. Some dosage forms listed on this page may not apply to the brand name Gas-X with Maalox Extra Strength.

Applies to calcium carbonate / simethicone: oral tablet chewable.

Serious side effects

WARNING/CAUTION: Even though it may be rare, some people may have very bad and sometimes deadly side effects when taking a drug. Tell your doctor or get medical help right away if you have any of the following signs or symptoms that may be related to a very bad side effect:

Other side effects

All drugs may cause side effects. However, many people have no side effects or only have minor side effects. Call your doctor or get medical help if any of these side effects or any other side effects bother you or do not go away:

These are not all of the side effects that may occur. If you have questions about side effects, call your doctor. Call your doctor for medical advice about side effects.

You may report side effects to the FDA at 1-800-332-1088. You may also report side effects at

For Healthcare Professionals

Applies to calcium carbonate/simethicone: oral capsule, oral liquid, oral suspension, oral tablet chewable.


Frequency not reported: Constipation[Ref]

More about Gas-X with Maalox Extra Strength (calcium carbonate / simethicone)

Patient resources

Other brands

Tums Chewy Bites with Gas Relief (Lemon & Strawberry), Alka-Seltzer Heartburn + Gas

Other formulations

Related treatment guides


1. (2019) "Product Information. Tums with Gas Relief Chewy Bites (calcium carbonate-simethicone)." GlaxoSmithKline Consumer Healthcare Holdings (US) LLC

Further information

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

Some side effects may not be reported. You may report them to the FDA.