Simeticone

What is simeticone?

Simeticone (also spelled simethicone) is an anti-flatulent medicine used to relieve symptoms caused by excess gas in the stomach and intestines. It is a non-systemic treatment, meaning it works locally in the digestive tract and is not absorbed into the bloodstream. You can buy it in pharmacies and shops without a prescription. Simeticone is sold under several brand names, including WindSetlers, Wind-Eze, Infacol, Dentinox Colic Drops, and Rennie Deflatine[1]. 

What is simeticone used for?

Simeticone is used to relieve discomfort caused by trapped gas in the digestive system, such as[1]: 

• Flatulence (wind) 

• Bloating 

• Trapped wind 

• Colic in babies 

• A swollen or distended stomach 

• General discomfort from intestinal gas 

How does simeticone work?

Simeticone works by breaking down gas bubbles in the gut. It reduces the surface tension of the bubbles, causing them to merge into larger bubbles that can be passed more easily through burping or flatulence[1].  

Who can take simeticone?

Simeticone is considered safe for[1]: 

• Adults and older people 

• Children and infants, when using age-appropriate products like Infacol 

• Pregnant and breastfeeding women, though it's best to consult a doctor first 

You should speak to your doctor or pharmacist first if you have[1]: 

• An allergy to simeticone or any of its ingredients 

• Been advised to avoid certain preservatives, such as hydroxybenzoates, which may be present in some formulations 

• A thyroid problem 

Please tell your doctor or pharmacist about any conditions you may have or medication you take before you start treatment, and always follow the instructions in the Patient Information Leaflet[2]. 

What is the typical dosage of simeticone?

The correct dose depends on the product and the person’s age. Common examples include[1]: 

• For wind in adults, the usual dose is between 100mg and 250mg, taken as needed, up to 3 or 4 times a day 

• For babies with colic, the usual dose is between 20mg and 40mg, up to 6 times a day. However, some brands will differ in being given to your child with or after food 

Always follow the instructions provided on the product label or as directed by a healthcare professional. 

How do you take simeticone?

It depends on the type of simeticone you take[1]: 

• Tablets or capsules:  

  ○ Swallow whole with water 

• Chewable tablets: 

  ○ Chew well before swallowing, and follow with a drink of water 

• Liquid: 

  ○ Shake the bottle, measure the correct dose using a syringe, medicine spoon, or small measuring cup. Do not use a kitchen teaspoon 

• Infant colic drops: 

  ○ Shake the bottle, measure the correct dose using the dropper or syringe provided and give it right away. Some brands can be added to your baby’s milk 

Can you stop taking simeticone?

Yes. Simeticone is usually taken only when needed. You can stop using it once your symptoms go away – there’s no need to taper off or complete a fixed course[1]. 

What do you do if you take too much simeticone?

Simeticone is generally very safe, even in large amounts. Taking too much may cause mild stomach upset. If you're concerned or feel unwell after an overdose, seek medical advice[1].

What do you do if you forget to take simeticone

Since simeticone is taken when needed, there’s no problem if you miss a dose. Simply take it the next time symptoms occur. Do not double the dose[1]. 

What medicines can’t you take with simeticone?

Simeticone is non-reactive and usually safe to take alongside most other medicines. However, some combination products like Rennie Deflatine contain additional ingredients (such as antacids) that may interfere with other medications. These may include[3]: 

• Certain antibiotics like tetracyclines or quinolones 

• Thyroid medicines like levothyroxine 

• Iron supplements 

• Bisphosphonates 

• Some antivirals or diuretics 

Always inform your doctor or pharmacist about all medications and supplements you take before you start a new medicine, and follow the instructions in the Patient Information Leaflet[2]. 

What are the side effects of simeticone?

Simeticone is usually well tolerated, but rare side effects may occur, including[1]: 

• Nausea 

• Constipation 

• Allergic reactions, such as rash, itching, swelling, or breathing problems 

You should contact your GP if you experience any of these symptoms. In rare cases, the medicine may cause a serious allergic reaction (anaphylaxis). You should call 999 or visit A&E immediately if you believe this is happening[1]. 

Symptoms of anaphylaxis include[1]:  

• Difficulty breathing  

• Tightness in throat and chest  

• Swelling of the tongue or throat  

• Feeling faint or dizzy  

• Blue/grey skin or lips  

• Loss of consciousness 

If you experience any side effects, including those not listed, you are encouraged to report them via the Yellow Card Scheme or contact your doctor, pharmacist, or nurse. This information is intended as a summary for general awareness and does not replace professional medical advice. 

The information provided in the side effects section is not a comprehensive list of all possible side effects associated with this medication. For a complete list of side effects, please refer to the Patient Information Leaflet (PIL) provided with your medication or consult your healthcare professional[2]. 

Frequently asked questions about simeticone

Is simeticone safe for babies? 
Yes, it is commonly used in products like Infacol and Dentinox Colic Drops[1]. 

Can I take simeticone every day? 
Yes, you can take it as needed. It is not habit-forming[1]. 

Does simeticone help with acid reflux? 
Not directly, but it may reduce bloating that sometimes worsens reflux symptoms[1]. 

Can I take simeticone with food? 
Yes, it's often taken with or just after meals[1]. 

Is simeticone safe in pregnancy? 
Generally yes, but it’s always best to speak with your doctor first[1]. 

Does simeticone cause drowsiness? 
No, it does not affect alertness or cause sleepiness[1]. 

How quickly does simeticone work? 
It often begins working within 30 minutes[1]. 

Can simeticone be used long-term? 
Yes, but if symptoms persist, it’s a good idea to consult a healthcare professional[1]. 

For the official NHS guide to simeticone, visit their website.