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Lansoprazole is a common drug that is used to provide treatment when there is an excessive amount of acid in the stomach. This drug is designed to give remedy to gastric and duodenal ulcers, erosive esophagitis as well as gastroesophageal reflux disease (GORD).

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What is lansoprazole?

Lansoprazole is a proton pump inhibitor (PPI) used in the treatment of acid reflux, it works by reducing the amount of acid produced in the stomach. This helps in preventing ulcers from developing and helps reduce symptoms such as heartburn.

Before taking lansoprazole

Do not take lansoprazole if you are allergic to any ingredients included in the medicine. You can find the full list in the patient information leaflet. Inform your doctor if any of the following apply to you:

  • If you have previously had an allergic reaction to any other medicine.
  • If you have difficulty swallowing, vomiting or weight loss.
  • If you have any problems with your liver.
  • If you are trying to become pregnant, are currently pregnant or breastfeeding.

You should speak to your doctor if you are taking other medicines as there may be potential interactions. This includes medicine that you can buy without a prescription including herbal medicines.

How do I take lansoprazole?

  • You should always take lansoprazole exactly as your doctor has told you to.
  • Take your capsule at least 30 minutes before a meal with a glass of water.
  • Swallow the capsule whole, do not crush or chew.
  • Do not take remedies for indigestion within two hours before or after taking lansoprazole as it can interfere with the way your body absorbs it.
  • Do not take a double dose if you forget to take your dose. Take it when you remember unless it’s almost time for the next dose.

How do I store lansoprazole?

  • Keep this medicine away and out of sight from children.
  • If the medicine has passed its expiry date stated, do not take it.
  • Avoid storing it at temperatures above 25°C.
  • Keep lansoprazole in the original packaging as this will protect the capsules from moisture.

Side-effects and precautions

There are some food and drinks which may aggravate your stomach, alcohol and spicy foods for example. Try to avoid these whilst you are taking lansoprazole as well as eating large meals.

If you are a smoker, you are increasing the amount of acid that is produced by the stomach resulting in your symptoms becoming worse. Talk to your doctor or pharmacist about how to quit, they may prescribe a treatment such as Champix.

Always check with your doctor or pharmacist that you can take lansoprazole with other over-the-counter medicines that you may be taking as they could cause interactions.

Common side-effects of lansoprazole include:

  • Headache – drink plenty of water, talk to your pharmacist regarding a painkiller if the headache persists.
  • Feeling tired/dizzy – Avoid driving or using tools or machines until you feel better.
  • Constipation – eat a balanced diet and drink plenty of water.
  • Nausea/vomiting – Avoid spicy foods and alcohol.
  • Diarrhoea

Patient information

You can find the patient information leaflet here.

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