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Gas-X Ingredients – What to Know About Simethicone

The active ingredient in Gas-X is simethicone. It's a gas relief agent that works fast to help relieve the pressure from painful gas and bloating.

a young man with dark hair sitting while holding stomach in discomfort while wearing a red shirt
what is simethicone

What Is Simethicone?

Simethicone is the active ingredient in Gas-X. It works to break down gas bubbles in your stomach by allowing gas bubbles in the stomach and intestines to come together more easily, which allows for easier passage, and faster relief.

Simethicone goes to work fast to relieve many of the symptoms of gas and bloating, like fullness, pressure, and of course, gas.

How Does Simethicone Work?

Gas-X helps break up the gas bubbles in your digestive tract so your body can deal with gas naturally vs. other products which need to be taken proactively before gas occurs.


Breaks down gas bubbles in your digestive tract.


Combines many small bubbles into larger bubbles, which can be expelled more easily.

surface tension

Reduces the surface tension of the formed gas bubbles, which prevents bubble formation.

Frequently Asked Questions

You’ve got questions. We’ve got answers. Check out our  FAQs page.

  • What is the active ingredient in Gas-X?

    The active ingredient in Gas-X is simethicone. Simethicone is the #1 doctor-recommended OTC ingredient for fast gas relief – it helps break up gas bubbles in your stomach and intestines. Once this trapped gas is broken down, your body can then get rid of the gas naturally.

  • What is simethicone used for?

    Simethicone, the active ingredient of Gas-X, is used for the relief of pressure, bloating, and fullness commonly referred to as gas.

  • How fast does simethicone work?

    Everyone’s biochemistry is a little different, so speed of gas relief may vary by person. But, in general, Gas-X relieves pressure, bloating, fullness and discomfort caused by excess stomach and intestinal gas in minutes. If you have prolonged discomfort, it’s best to consult with your doctor, just in case.

  • Can I take Gas-X?

    If you are uncertain if Gas-X is appropriate for you, please speak to your doctor or a pharmacist. Simethicone, the active ingredient in Gas-X, works fast, without being absorbed into the bloodstream. Please use Gas-X products only as directed.

  • What symptoms is Gas-X indicated for?

    Gas-X relieves the pressure, abdominal bloating, and discomfort commonly referred to as gas.

  • What is the difference between Beano and Gas-X? Do they both provide gas relief?

    Beano and Gas-X are both anti-gas products but have different ingredients and work different ways. Beano contains alpha galactosidase, an enzyme that is taken before meals, to break down complex carbohydrates in food to reduce gas production. Gas-X contains simethicone which acts on the gas produced in the stomach and intestine to help reduce pressure, bloating and fullness. It breaks up gas bubbles in your stomach and intestine. Once this trapped gas is broken down, your body can then deal with this gas naturally.


Gas-X vs. Antacids

The active ingredients in antacids are very different from simethicone, but can you take both for gas pain?

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