Like all medications, simeticone can have side effects, although not everyone will experience them.
These include nausea, constipation, or side effects caused by an allergic reaction.
Symptoms of a severe allergic reaction include:
Skin rash, hives
Itchy skin
Swelling of the face, tongue, mouth, or throat
Difficulty breathing
If you notice any side effects while taking simeticone, stop use and speak to your doctor or pharmacist as soon as possible, if necessary.