Ant­acids are med­ic­a­tions you can buy over the counter at any chem­ist without the need for a doctor’s pre­scrip­tion and are used to treat the symp­toms of heart­burn. They are usu­ally avail­able in tab­let or liquid form.

What is heartburn?

Des­pite the name, heart­burn has noth­ing to do with the heart. Heart­burn is caused when stom­ach acid passes out of the stom­ach and up into the oeso­phagus (the tube that car­ries food from the mouth to the stomach).

acid reflux heartburn Remedies for treating the symptoms of heartburnThe acid can irrit­ate the sur­face of the oeso­phagus, lead­ing to the burn­ing sen­sa­tion asso­ci­ated with heart­burn. Health pro­fes­sion­als prefer to use the term gastro-oesophageal reflux dis­ease, or GORD, to describe this con­di­tion because it’s a more accur­ate term than heart­burn. See the Use­ful links sec­tion for more inform­a­tion about GORD.

How do ant­acids work?

Ant­acids can work in two ways:

  • they can coat the sur­face of the oeso­phagus to pro­tect it from stom­ach acids, or
  • they can pro­duce a gel in your stom­ach, which helps pre­vent acid leak­ing up into your oesophagus.

Are ant­acids effective?

There is evid­ence that ant­acids are effect­ive in provid­ing short-term relief for the symp­toms of GORD. How­ever, long-term use is not recom­men­ded because there are more effect­ive pre­scrip­tion med­ic­a­tions for the treat­ment of recur­ring GORD, such as proton-pump inhibitors.

Life­style changes, par­tic­u­larly changes in diet, can reduce the symp­toms of GORD. Your doc­tor will be able to provide more advice about diet.

You should see your doc­tor if the symp­toms of GORD per­sist for more than a week, or they quickly return once the effects of the ant­acids wear off.

Who should not take antacids?

The long-term use of ant­acids in young chil­dren is not recom­men­ded. This is because they can inter­fere with the body’s abil­ity to absorb cal­cium, which is required for the devel­op­ment of healthy bones.

There have been a num­ber of cases where chil­dren have developed rick­ets (a devel­op­mental dis­order) due to tak­ing high-dose ant­acids over the course of five to six weeks.

Ant­acids are gen­er­ally con­sidered to be safe to take dur­ing preg­nancy, but they can inter­fere with the absorp­tion of iron. There­fore, if you need to take iron sup­ple­ments dur­ing preg­nancy, take them at least two hours before, or after, tak­ing antacids.

Sim­il­arly, ant­acids may inter­fere with your body’s abil­ity to absorb other types of med­ic­a­tion, par­tic­u­larly if you take them at the same time. Your doc­tor or phar­macist can advise you about the best way to take both types of medication.

Some ant­acids con­tain high levels of mag­nesium and alu­minium, which may be harm­ful for people who have a his­tory of kid­ney dis­ease. Also, some ant­acids con­tain high levels of salt, which may be harm­ful for those with high blood pres­sure (hypertension).

Ask your phar­macist or your doc­tor for advice about which ant­acids are suit­able for you if you have high blood pres­sure or a his­tory of kid­ney disease.

Side effects

A study that looked at how ant­acids affect people found that 12% of those who took ant­acids exper­i­enced side effects. The side effects included:

  • diarrhoea,
  • nausea,
  • vomit­ing,
  • blood in the stools,
  • flat­u­lence (wind), and
  • con­stip­a­tion.

How­ever, any side effects that you exper­i­ence should pass once you stop tak­ing antacids.