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Key Features
  • Can help you lose weight when taken in conjunction with a low-calorie diet
  • Works by reducing the absorption of fat in the food you eat
  • Only suitable for those who are severely overweight

About Xenical

Xenical is the brand name for orlistat, a weight-loss medication which is prescribed to those who are severely overweight. Orlistat is part of a group of medicines known as lipase inhibitors which work in the intestines to prevent the absorption of some of the consumed in your diet. This fat is then eliminated by passing it through your faeces.

Xenical FAQs

How do I take Xenical? 

Take one capsule one hour before or after a main meal, three times a day. If a meal is missed or contains very little fat Xenical should not be taken. You should never take more than one capsule at a time, as this does not increase effectiveness.
How effective is Xenical?

Xenical is effective at helping obese or severely overweight people lose weight. It must be taken regularly and in conjunction with a low-calorie, low-fat diet in which no more than 30% of your daily calorie intake comes from fat. Remember that over-consumption of fat and calories may reduce any effect Xenical has.

What are the side effects?

There are some side effects associated with Xenical, the most common of which may include:

  • Headaches
  • Abdominal pain or discomfort
  • Flatulence
  • Oily or fatty stools
  • Liquid stools


To reduce the risk of diarrhoea, try and spread your daily fat intake evenly across your meals and do not consume a high fat diet. For a full list of possible effects you should read the patient information leaflet that comes with the medication.

When is Xenical not suitable?Xenical will only work as part of a weight management programme, and should only be taken by those who are overweight. It is not suitable if you are pregnant or breast feeding. It is not safe to take if you have certain medical conditions, so please tell us about any when asked.
Can I take other medicines with Xenical?Certain drugs can interact with Xenical and cause a serious reaction, so please provide our doctors with a full list of our medicines when asked. You should also inform your doctor if you start taking any other medication while taking Xenical.
Is Xenical a replacement for a healthy diet?No – for Xenical to be successful, you should take it within a calorie controlled, low fat diet.  Once you have stopped taking this medication, it is important to continue a healthy diet alongside regular exercise.
How quickly will I receive my prescription?Our doctors aim to post your prescription within one working day and it should arrive within three working days. You do not have to sign for it upon delivery.
Where do I have to take the paper prescription?You can take your prescription into any pharmacy in the Republic of Ireland.

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