- Interactions
- Introduction
- Missed-or-extra-doses
- Missed-or-extra-doses
- Names
- Side-effects
- Who cannot take antacid medicines?
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Antacid medicines
- Overview
- antacid-medicines Clinical trials
- Antacid medicines
- antacid-medicines Considerations
Introduction

Heartburn
Heartburn is burning chest pain or discomfort that occurs when stomach acid leaks out of the stomach and into the oesophagus (gullet). The acid irritates the surface of the oesophagus which causes the burning sensation in the chest. The medical term for this is gastro-oesophageal reflux disease (GORD).

Eat right for your digestion
How to eat and drink to ensure a good digestion, including foods to avoid and which ones to fill up on.
Antacids are a type of medication that can control the acid levels in your stomach.
They are available over the counter from pharmacies and are commonly used to treat the symptoms of heartburn and indigestion.
How antacids work
Antacids work by counteracting (neutralising) the acid in your stomach that is used to aid digestion. This can reduce the symptoms of heartburn and relieve pain.
Some antacids also coat the surface of the oesophagus (gullet) with a protective barrier against stomach acid or produce a gel on the stomach’s surface which helps stop acid leaking into the oesophagus.
Different types of antacids
Antacids are available in the form of chewable tablets or liquid. They are sold under various brand names, but they contain common ingredients, including:
- aluminium hydroxide
- magnesium carbonate
- magnesium trisilicate
Sometimes extra ingredients are added to help treat other problems, such as simeticone to relieve flatulence and alginates to prevent acid flowing into your oesophagus.
Who cannot take antacids?
Antacids are not suitable for everyone.
For example, many antacids are not recommended for children under the age of 12 and people with certain health conditions (such as kidney disease). Antacids can also interfere with other medications, so you may not be able to take them while you are being treated for another condition.
Antacids are generally considered safe to take during pregnancy, but you should discuss it with your GP or pharmacist beforehand.
Read more about who cannot take antacid medicines.
What are the possible side effects?
Like all medicines, antacids can have side effects. Common side effects include:
- diarrhoea
- constipation
- flatulence (wind)
- stomach cramps
- feeling sick or vomiting
If you experience either constipation or diarrhoea after taking antacids, it may be possible to switch to an alternative medicine. Speak to your GP or pharmacist for advice.
Any side effects you experience while taking antacids should pass once you stop taking the medication. However, you should visit your GP if they continue.
Missed or extra doses
Take antacid medicines as directed on the patient information leaflet that comes with the medicine, or as advised by your GP or pharmacist.
If you miss a dose of an antacid, it will usually not be necessary to alter your next dose. It is likely that you can carry on taking your normal dose. For specific advice about what to do, refer to the patient information leaflet that comes with your medicine.
Taking extra doses could cause several unpleasant side effects, such as nausea, vomiting, diarrhoea and constipation.
Contact your GP or pharmacist immediately if you think that you have taken more antacids than you should have. Alternatively, you can call NHS Direct on 0845 46 47 or NHS 111 for advice.
Page last reviewed: 12/12/2012
Next review due: 12/12/2014
Useful links
NHS Choices links
- Gastro-oesophageal reflux
- Indigestion
- Indigestion in pregnancy
- Digestive health
- Pharmacy and medicine
- Medicines information
External links

The Yellow Card Scheme
The MHRA has produced a video that explains how the Yellow Card Scheme can be used to report the side effects of medication

Digestive health
Find out how to beat common digestive problems like bloating and indigestion
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Antacid medicines
Introduction
Antacids are a type of medication that can control the acid levels in your stomach.
They are available over the counter from pharmacies and are commonly used to treat the symptoms of heartburn and indigestion.
How antacids work
Antacids work by counteracting (neutralising) the acid in your stomach that is used to aid digestion. This can reduce the symptoms of heartburn and relieve pain.
Some antacids also coat the surface of the oesophagus (gullet) with a protective barrier against stomach acid or produce a gel on the stomach’s surface which helps stop acid leaking into the oesophagus.
Different types of antacids
Antacids are available in the form of chewable tablets or liquid. They are sold under various brand names, but they contain common ingredients, including:
- aluminium hydroxide
- magnesium carbonate
- magnesium trisilicate
Sometimes extra ingredients are added to help treat other problems, such as simeticone to relieve flatulence and alginates to prevent acid flowing into your oesophagus.
Who cannot take antacids?
Antacids are not suitable for everyone.
For example, many antacids are not recommended for children under the age of 12 and people with certain health conditions (such as kidney disease). Antacids can also interfere with other medications, so you may not be able to take them while you are being treated for another condition.
Antacids are generally considered safe to take during pregnancy, but you should discuss it with your GP or pharmacist beforehand.
Read more about who cannot take antacid medicines.
What are the possible side effects?
Like all medicines, antacids can have side effects. Common side effects include:
- diarrhoea
- constipation
- flatulence (wind)
- stomach cramps
- feeling sick or vomiting
If you experience either constipation or diarrhoea after taking antacids, it may be possible to switch to an alternative medicine. Speak to your GP or pharmacist for advice.
Any side effects you experience while taking antacids should pass once you stop taking the medication. However, you should visit your GP if they continue.
Missed or extra doses
Take antacid medicines as directed on the patient information leaflet that comes with the medicine, or as advised by your GP or pharmacist.
If you miss a dose of an antacid, it will usually not be necessary to alter your next dose. It is likely that you can carry on taking your normal dose. For specific advice about what to do, refer to the patient information leaflet that comes with your medicine.
Taking extra doses could cause several unpleasant side effects, such as nausea, vomiting, diarrhoea and constipation.
Contact your GP or pharmacist immediately if you think that you have taken more antacids than you should have. Alternatively, you can call NHS Direct on 0845 46 47 or NHS 111 for advice.
Useful Links
- Published Date
- 2013-06-17 10:18:22Z
- Last Review Date
- 2012-12-12 00:00:00Z
- Next Review Date
- 2014-12-12 00:00:00Z
- Classification
- Antacid drugs,Gastro-oesophageal reflux disease,Heartburn,Medicines and Healthcare products Regulatory Agency
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Antacid medicines
- Overview
- antacid-medicines Clinical trials
- Antacid medicines
- antacid-medicines Considerations
Introduction

Heartburn
Heartburn is burning chest pain or discomfort that occurs when stomach acid leaks out of the stomach and into the oesophagus (gullet). The acid irritates the surface of the oesophagus which causes the burning sensation in the chest. The medical term for this is gastro-oesophageal reflux disease (GORD).

Eat right for your digestion
How to eat and drink to ensure a good digestion, including foods to avoid and which ones to fill up on.
Antacids are a type of medication that can control the acid levels in your stomach.
They are available over the counter from pharmacies and are commonly used to treat the symptoms of heartburn and indigestion.
How antacids work
Antacids work by counteracting (neutralising) the acid in your stomach that is used to aid digestion. This can reduce the symptoms of heartburn and relieve pain.
Some antacids also coat the surface of the oesophagus (gullet) with a protective barrier against stomach acid or produce a gel on the stomach’s surface which helps stop acid leaking into the oesophagus.
Different types of antacids
Antacids are available in the form of chewable tablets or liquid. They are sold under various brand names, but they contain common ingredients, including:
- aluminium hydroxide
- magnesium carbonate
- magnesium trisilicate
Sometimes extra ingredients are added to help treat other problems, such as simeticone to relieve flatulence and alginates to prevent acid flowing into your oesophagus.
Who cannot take antacids?
Antacids are not suitable for everyone.
For example, many antacids are not recommended for children under the age of 12 and people with certain health conditions (such as kidney disease). Antacids can also interfere with other medications, so you may not be able to take them while you are being treated for another condition.
Antacids are generally considered safe to take during pregnancy, but you should discuss it with your GP or pharmacist beforehand.
Read more about who cannot take antacid medicines.
What are the possible side effects?
Like all medicines, antacids can have side effects. Common side effects include:
- diarrhoea
- constipation
- flatulence (wind)
- stomach cramps
- feeling sick or vomiting
If you experience either constipation or diarrhoea after taking antacids, it may be possible to switch to an alternative medicine. Speak to your GP or pharmacist for advice.
Any side effects you experience while taking antacids should pass once you stop taking the medication. However, you should visit your GP if they continue.
Missed or extra doses
Take antacid medicines as directed on the patient information leaflet that comes with the medicine, or as advised by your GP or pharmacist.
If you miss a dose of an antacid, it will usually not be necessary to alter your next dose. It is likely that you can carry on taking your normal dose. For specific advice about what to do, refer to the patient information leaflet that comes with your medicine.
Taking extra doses could cause several unpleasant side effects, such as nausea, vomiting, diarrhoea and constipation.
Contact your GP or pharmacist immediately if you think that you have taken more antacids than you should have. Alternatively, you can call NHS Direct on 0845 46 47 or NHS 111 for advice.
Page last reviewed: 12/12/2012
Next review due: 12/12/2014
Comments
The 1 comments about ‘Definition’ posted are personal views. Any information they give has not been checked and may not be accurate.
sophiecymru said on 09 March 2011
I’m a bit confused because this says antacids work in a lsightly different way to what it says on your page on Indigestion! I don’t know which one is right now….
Report this content as offensive or unsuitable comment id 12934
Useful links
NHS Choices links
- Gastro-oesophageal reflux
- Indigestion
- Indigestion in pregnancy
- Digestive health
- Pharmacy and medicine
- Medicines information
External links

The Yellow Card Scheme
The MHRA has produced a video that explains how the Yellow Card Scheme can be used to report the side effects of medication

Digestive health
Find out how to beat common digestive problems like bloating and indigestion
(function (i, s, o, g, r, a, m) {
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Antacid medicines
- Overview
- antacid-medicines Clinical trials
- antacid-medicines Antacid medicines
- antacid-medicines Considerations
Introduction

Heartburn
Heartburn is burning chest pain or discomfort that occurs when stomach acid leaks out of the stomach and into the oesophagus (gullet). The acid irritates the surface of the oesophagus which causes the burning sensation in the chest. The medical term for this is gastro-oesophageal reflux disease (GORD).

Eat right for your digestion
How to eat and drink to ensure a good digestion, including foods to avoid and which ones to fill up on.
Antacids are a type of medication that can control the acid levels in your stomach.
They are available over the counter from pharmacies and are commonly used to treat the symptoms of heartburn and indigestion.
How antacids work
Antacids work by counteracting (neutralising) the acid in your stomach that is used to aid digestion. This can reduce the symptoms of heartburn and relieve pain.
Some antacids also coat the surface of the oesophagus (gullet) with a protective barrier against stomach acid or produce a gel on the stomach’s surface which helps stop acid leaking into the oesophagus.
Different types of antacids
Antacids are available in the form of chewable tablets or liquid. They are sold under various brand names, but they contain common ingredients, including:
- aluminium hydroxide
- magnesium carbonate
- magnesium trisilicate
Sometimes extra ingredients are added to help treat other problems, such as simeticone to relieve flatulence and alginates to prevent acid flowing into your oesophagus.
Who cannot take antacids?
Antacids are not suitable for everyone.
For example, many antacids are not recommended for children under the age of 12 and people with certain health conditions (such as kidney disease). Antacids can also interfere with other medications, so you may not be able to take them while you are being treated for another condition.
Antacids are generally considered safe to take during pregnancy, but you should discuss it with your GP or pharmacist beforehand.
Read more about who cannot take antacid medicines.
What are the possible side effects?
Like all medicines, antacids can have side effects. Common side effects include:
- diarrhoea
- constipation
- flatulence (wind)
- stomach cramps
- feeling sick or vomiting
If you experience either constipation or diarrhoea after taking antacids, it may be possible to switch to an alternative medicine. Speak to your GP or pharmacist for advice.
Any side effects you experience while taking antacids should pass once you stop taking the medication. However, you should visit your GP if they continue.
Missed or extra doses
Take antacid medicines as directed on the patient information leaflet that comes with the medicine, or as advised by your GP or pharmacist.
If you miss a dose of an antacid, it will usually not be necessary to alter your next dose. It is likely that you can carry on taking your normal dose. For specific advice about what to do, refer to the patient information leaflet that comes with your medicine.
Taking extra doses could cause several unpleasant side effects, such as nausea, vomiting, diarrhoea and constipation.
Contact your GP or pharmacist immediately if you think that you have taken more antacids than you should have. Alternatively, you can call NHS Direct on 0845 46 47 or NHS 111 for advice.
Page last reviewed: 12/12/2012
Next review due: 12/12/2014
Comments
The 1 comments about ‘Definition’ posted are personal views. Any information they give has not been checked and may not be accurate.
sophiecymru said on 09 March 2011
I’m a bit confused because this says antacids work in a lsightly different way to what it says on your page on Indigestion! I don’t know which one is right now….
Report this content as offensive or unsuitable comment id 12934
Useful links
NHS Choices links
- Gastro-oesophageal reflux
- Indigestion
- Indigestion in pregnancy
- Digestive health
- Pharmacy and medicine
- Medicines information
External links

The Yellow Card Scheme
The MHRA has produced a video that explains how the Yellow Card Scheme can be used to report the side effects of medication

Digestive health
Find out how to beat common digestive problems like bloating and indigestion
(function (i, s, o, g, r, a, m) {
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Antacid medicines
- Overview
- antacid-medicines Clinical trials
- Antacid medicines
- antacid-medicines Considerations
Introduction

Heartburn
Heartburn is burning chest pain or discomfort that occurs when stomach acid leaks out of the stomach and into the oesophagus (gullet). The acid irritates the surface of the oesophagus which causes the burning sensation in the chest. The medical term for this is gastro-oesophageal reflux disease (GORD).

Eat right for your digestion
How to eat and drink to ensure a good digestion, including foods to avoid and which ones to fill up on.
Antacids are a type of medication that can control the acid levels in your stomach.
They are available over the counter from pharmacies and are commonly used to treat the symptoms of heartburn and indigestion.
How antacids work
Antacids work by counteracting (neutralising) the acid in your stomach that is used to aid digestion. This can reduce the symptoms of heartburn and relieve pain.
Some antacids also coat the surface of the oesophagus (gullet) with a protective barrier against stomach acid or produce a gel on the stomach’s surface which helps stop acid leaking into the oesophagus.
Different types of antacids
Antacids are available in the form of chewable tablets or liquid. They are sold under various brand names, but they contain common ingredients, including:
- aluminium hydroxide
- magnesium carbonate
- magnesium trisilicate
Sometimes extra ingredients are added to help treat other problems, such as simeticone to relieve flatulence and alginates to prevent acid flowing into your oesophagus.
Who cannot take antacids?
Antacids are not suitable for everyone.
For example, many antacids are not recommended for children under the age of 12 and people with certain health conditions (such as kidney disease). Antacids can also interfere with other medications, so you may not be able to take them while you are being treated for another condition.
Antacids are generally considered safe to take during pregnancy, but you should discuss it with your GP or pharmacist beforehand.
Read more about who cannot take antacid medicines.
What are the possible side effects?
Like all medicines, antacids can have side effects. Common side effects include:
- diarrhoea
- constipation
- flatulence (wind)
- stomach cramps
- feeling sick or vomiting
If you experience either constipation or diarrhoea after taking antacids, it may be possible to switch to an alternative medicine. Speak to your GP or pharmacist for advice.
Any side effects you experience while taking antacids should pass once you stop taking the medication. However, you should visit your GP if they continue.
Missed or extra doses
Take antacid medicines as directed on the patient information leaflet that comes with the medicine, or as advised by your GP or pharmacist.
If you miss a dose of an antacid, it will usually not be necessary to alter your next dose. It is likely that you can carry on taking your normal dose. For specific advice about what to do, refer to the patient information leaflet that comes with your medicine.
Taking extra doses could cause several unpleasant side effects, such as nausea, vomiting, diarrhoea and constipation.
Contact your GP or pharmacist immediately if you think that you have taken more antacids than you should have. Alternatively, you can call NHS Direct on 0845 46 47 or NHS 111 for advice.
Page last reviewed: 12/12/2012
Next review due: 12/12/2014
Comments
The 1 comments about ‘Definition’ posted are personal views. Any information they give has not been checked and may not be accurate.
sophiecymru said on 09 March 2011
I’m a bit confused because this says antacids work in a lsightly different way to what it says on your page on Indigestion! I don’t know which one is right now….
Report this content as offensive or unsuitable comment id 12934
Useful links
NHS Choices links
- Gastro-oesophageal reflux
- Indigestion
- Indigestion in pregnancy
- Digestive health
- Pharmacy and medicine
- Medicines information
External links

The Yellow Card Scheme
The MHRA has produced a video that explains how the Yellow Card Scheme can be used to report the side effects of medication

Digestive health
Find out how to beat common digestive problems like bloating and indigestion
(function (i, s, o, g, r, a, m) {
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Antacid medicines
- Overview
- antacid-medicines Clinical trials
- Antacid medicines
- antacid-medicines Considerations
Introduction

Heartburn
Heartburn is burning chest pain or discomfort that occurs when stomach acid leaks out of the stomach and into the oesophagus (gullet). The acid irritates the surface of the oesophagus which causes the burning sensation in the chest. The medical term for this is gastro-oesophageal reflux disease (GORD).

Eat right for your digestion
How to eat and drink to ensure a good digestion, including foods to avoid and which ones to fill up on.
Antacids are a type of medication that can control the acid levels in your stomach.
They are available over the counter from pharmacies and are commonly used to treat the symptoms of heartburn and indigestion.
How antacids work
Antacids work by counteracting (neutralising) the acid in your stomach that is used to aid digestion. This can reduce the symptoms of heartburn and relieve pain.
Some antacids also coat the surface of the oesophagus (gullet) with a protective barrier against stomach acid or produce a gel on the stomach’s surface which helps stop acid leaking into the oesophagus.
Different types of antacids
Antacids are available in the form of chewable tablets or liquid. They are sold under various brand names, but they contain common ingredients, including:
- aluminium hydroxide
- magnesium carbonate
- magnesium trisilicate
Sometimes extra ingredients are added to help treat other problems, such as simeticone to relieve flatulence and alginates to prevent acid flowing into your oesophagus.
Who cannot take antacids?
Antacids are not suitable for everyone.
For example, many antacids are not recommended for children under the age of 12 and people with certain health conditions (such as kidney disease). Antacids can also interfere with other medications, so you may not be able to take them while you are being treated for another condition.
Antacids are generally considered safe to take during pregnancy, but you should discuss it with your GP or pharmacist beforehand.
Read more about who cannot take antacid medicines.
What are the possible side effects?
Like all medicines, antacids can have side effects. Common side effects include:
- diarrhoea
- constipation
- flatulence (wind)
- stomach cramps
- feeling sick or vomiting
If you experience either constipation or diarrhoea after taking antacids, it may be possible to switch to an alternative medicine. Speak to your GP or pharmacist for advice.
Any side effects you experience while taking antacids should pass once you stop taking the medication. However, you should visit your GP if they continue.
Missed or extra doses
Take antacid medicines as directed on the patient information leaflet that comes with the medicine, or as advised by your GP or pharmacist.
If you miss a dose of an antacid, it will usually not be necessary to alter your next dose. It is likely that you can carry on taking your normal dose. For specific advice about what to do, refer to the patient information leaflet that comes with your medicine.
Taking extra doses could cause several unpleasant side effects, such as nausea, vomiting, diarrhoea and constipation.
Contact your GP or pharmacist immediately if you think that you have taken more antacids than you should have. Alternatively, you can call NHS Direct on 0845 46 47 or NHS 111 for advice.
Page last reviewed: 12/12/2012
Next review due: 12/12/2014
Comments
The 1 comments about ‘Definition’ posted are personal views. Any information they give has not been checked and may not be accurate.
sophiecymru said on 09 March 2011
I’m a bit confused because this says antacids work in a lsightly different way to what it says on your page on Indigestion! I don’t know which one is right now….
Report this content as offensive or unsuitable comment id 12934
Useful links
NHS Choices links
- Gastro-oesophageal reflux
- Indigestion
- Indigestion in pregnancy
- Digestive health
- Pharmacy and medicine
- Medicines information
External links

The Yellow Card Scheme
The MHRA has produced a video that explains how the Yellow Card Scheme can be used to report the side effects of medication

Digestive health
Find out how to beat common digestive problems like bloating and indigestion
(function (i, s, o, g, r, a, m) {
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Antacid medicines
Who cannot take antacid medicines?
Antacids are not suitable for everyone, sometimes they need to be taken with caution or avoided completely.
Use in children
Many antacid medicines are not recommended for children under the age of 12.
Antacids containing calcium are not recommended for long-term use in children because they can interfere with the rate that calcium is absorbed into the body and carried through the bloodstream. The right levels of calcium are vital for healthy bones and childhood development.
Prolonged use of antacids containing calcium can also lead to muscle weakness and cramps.
Furthermore, there have been a number of cases linking the prolonged use of antacids containing magnesium and aluminium with rickets, a developmental disorder in infants that causes softening and weakening of the bones.
Always read the patient information leaflet that comes with a medicine to ensure it is suitable for children. Check the correct dosage and seek the advice of your GP or pharmacist about giving antacids to children under 12 years old.
Use in pregnancy
Most types of antacids are considered to be safe to take during pregnancy.
However, if you are pregnant or breastfeeding, seek advice from your GP or pharmacist before taking antacids.
Use with other conditions
In some cases, you may be advised not to use some antacids if you have certain health conditions.
Speak to your GP or pharmacist if you have an existing health condition and are unsure whether antacids are suitable for you.
You can also check the patient information leaflet that comes with all medication to ensure the medicine is suitable for you.
Use with other medicines
Taking antacids can sometimes interfere with your body’s ability to absorb other medications you may be taking.
Therefore, you may be advised to stop taking other medication while you are taking antacids.
For example, you may not be able to take calcium supplements for a condition such as osteoporosis at the same time as some antacids. Antacids can also alter the effectiveness of some antibiotics.
However, it’s important never to stop taking a medication prescribed for you without first consulting your GP or another suitably qualified healthcare professional.
Useful Links
- Published Date
- 2013-06-17 10:18:08Z
- Last Review Date
- 2012-12-12 00:00:00Z
- Next Review Date
- 2014-12-12 00:00:00Z
- Classification
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The 1 comments about ‘Definition’ posted are personal views. Any information they give has not been checked and may not be accurate.
sophiecymru said on 09 March 2011
I’m a bit confused because this says antacids work in a lsightly different way to what it says on your page on Indigestion! I don’t know which one is right now….
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