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Gas-X Regular Strength Side Effects

Generic name: simethicone

Medically reviewed by Last updated on Jan 18, 2020.

Note: This document contains side effect information about simethicone. Some of the dosage forms listed on this page may not apply to the brand name Gas-X Regular Strength.

For the Consumer

Applies to simethicone: oral capsule liquid filled, oral solution, oral suspension, oral tablet, oral tablet chewable

There have not been any common or important side effects reported with this medicine. However, if you notice any side effects, check with your doctor.

For Healthcare Professionals

Applies to simethicone: compounding liquid, compounding powder, oral capsule, oral disintegrating strip, oral liquid, oral suspension, oral tablet, oral tablet chewable


Uncommon (0.1% to 1%): Constipation, nausea

Rare (0.01% to 0.1%): Tongue edema[Ref]


Rare (0.01% to 0.1%): Face edema, hypersensitivity reactions[Ref]


Rare (0.01% to 0.1%): Respiratory difficulty[Ref]


Rare (0.01% to 0.1%): Pruritus, rash[Ref]


1. "Product Information. Maalox Anti-Gas Extra Strength (simethicone)." Novartis Consumer Health, Summit, NJ.

2. "Product Information. Mylicon (simethicone)." Johnson and Johnson Medical Inc, Arlington, TX.

3. Cerner Multum, Inc. "UK Summary of Product Characteristics." O 0

4. Cerner Multum, Inc. "Australian Product Information." O 0

More about Gas-X Regular Strength (simethicone)

Consumer resources

Other brands
Gas-X, Mylicon, Gas-X Extra Strength, Phazyme, ... +16 more

Professional resources

Related treatment guides

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.