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What is Omeprazole 20mg?

Omeprazole 20mg is a drug that contains the active ingredient omeprazole. It is primarily used to treat acid reflux, but can also be used to treat stomach ulcers as well as other conditions related to the stomach. Omeprazole is a proton pump inhibitor (PPI). PPIs work by reducing the amount of acid that’s produced in the stomach. Omeprazole is the generic version of the more expensive brand-name alternative, Losec.

Do not crush or chew the capsules
Do not take this medication after the expiry date
Do not store above 30°C

How does Omeprazole work?

Omeprazole is a proton pump inhibitor (PPI) that relieves the symptoms of acid reflux by decreasing the amount of acid that the stomach produces. This then limits the amount of acid that travels up the oesophagus and causes acid reflux.

How do you take Omeprazole?

Omeprazole should always be taken as directed by your doctor or pharmacist.  


Take one capsule daily, preferably at the same time each morning. While you can take your capsules with or without food, it is best to take omeprazole 30 minutes before food.


When taking omeprazole do not take any other indigestion remedies unless directed by your doctor.


Do not chew or crush the capsules.

How effective is Omeprazole in treating acid reflux?

Omeprazole is an effective way of treating acid reflux. In addition to taking omeprazole, it is important to consider the lifestyle factors that can contribute to acid reflux. These include, but are not limited to:

  • Smoking
  • Eating fatty or spicy foods
  • Being overweight

What are the most common side effects of Omeprazole?

Like all medications, Omeprazole can have side effects. However, not everyone will experience them and they are typically mild to moderate and only last a short period of time.

The most common side effects of Omeprazole are:

  • Headache
  • Stomach ache, nausea, or vomiting
  • Diarrhoea, constipation, gas or flatulence


For information about less common side effects, please see the patient information leaflet.

* Disclaimer: Results and individual responses to treatments may vary from person to person. If you do need medical advice you should always speak to a doctor, pharmacist or appropriate medical professional.