About this information
This NHS content is written for people in England. Medicine names, availability, prescribing and services may differ in other countries.
Gaviscon is a very safe medicine. Most people who take it do not have any side effects. If you do get a side effect, it's likely to be mild and will go away when you stop taking Gaviscon.
It’s rare, but the ingredients in some types of Gaviscon may be more likely to make you feel sick or cause vomiting, constipation or diarrhoea.
Talk to your doctor or pharmacist if you notice any side effects that bother you or do not go away.
View the original NHS website page ↗. Refreshed 19 August 2026.
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