Acid reflux/indigestion or heartburn are terms used interchangeably to describe the burning pain caused by stomach acid.
Get prescription acid reflux treatment such as regular Losec (Omeprazole) or Zantac (Ranitidine) for people with severe or ongoing acid symptoms.

Complete a short consultation before selecting your medication. All our consultations are approved by a UK Medical Doctor.

Summary of available medications

Medication Quantity Price
Zantac (Ranitidine) 150mg 30 or 60 tablets From £7.65
Ranitidine 150mg (Generic Zantac) 30 or 60 tablets From £5.95

All medications


Medication Quantity Price
Zantac (Ranitidine) 150mg 30 tablets £7.65
Zantac (Ranitidine) 150mg 60 tablets £13.65
Ranitidine 150mg (Generic Zantac) 30 tablets £5.95
Ranitidine 150mg (Generic Zantac) 60 tablets £10.95

All prices exclude prescription fee

Zantac is a brand of ranitidine which is used to treat a number of conditions including acid reflux, also known as heartburn. Acid reflux is caused by hydrochloric acid from the stomach flowing up through the oesophagus when the muscular valve (the lower oesophageal sphincter) which normally prevents this stops working. The lining of the oesophagus is not protected against this acid in the same way the stomach is, therefore a painful burning sensation is experienced in the chest as a result. Zantac tablets treat this condition by reducing the amount of acid produced in the stomach to prevent any excess acid reaching the oesophagus and allowing it to heal.

How long does Zantac take to work?

Zantac can begin to relieve the symptoms of acid reflux after 30 minutes.

How long will Zantac subdue the symptoms of acid reflux for?

Each dose of Zantac will suppress stomach acid for around 12 hours.

What else can I do to prevent acid reflux?

Making a number of lifestyle changes can effectively control and minimise the occurrence of acid reflux. Losing weight if necessary, stopping smoking and making dietary changes such as removing food triggers and eating smaller meals could all reduce the likelihood of suffering from heartburn.


It is advised to consult a GP if you are pregnant, breastfeeding, are taking any other medication, have problems with kidney function or have had an allergic reaction to Zantac before. It is not recommended to use Zantac continuously for more than 14 days.

Zantac contains the active ingredient ranitidine hydrochloride, an H2 receptor antagonist, which reduces the amount of acid produced by the stomach.

Take one tablet twice daily for 4-5 days until the symptoms settle, followed by one twice daily 2-3 times per week as required.

Zantac does not normally produce side effects although those which are experienced are usually mild. Common side effects of taking Zantac include:

  • Headache (sometimes severe)
  • Dizziness
  • Diarrhoea

Uncommon side effects of taking Zantac include:

  • Blurred vision
  • A rash

Very rare side effects of taking Zantac include:

  • Depression
  • False results in blood tests called ‘liver function tests’