The most common side effects of orlistat are changes in the regularity and consistency in bowel movements. The most common side effects of taking orlistat are:

• Loose bowel movements
• Oily and Fatty Stools
• Oil spotting on underwear or clothing
• Urgent need to use the toilet
• Stomach pains

No, you should not Orlistat if you are pregnant or breastfeeding.

This answer is different for each person and the food that they eat. Typically, most patients using orlistat lose 1-2 pounds a week.

The active ingredient in Orlistat is a lipase inhibitor. Lipase is the enzyme that breaks down dietary fats. The aim of a lipase inhibitor is to prevent dietary fats from absorbing into the body. Orlistat prevents the absorption of approximately 25% of dietary fat that is consumed within the diet. This idea is based on the fact that fat is the most calorie-dense of all the macronutrients, contributing 9 kcal/gram of fat. If only a small percentage of that fat is absorbed, then this will reduce overall energy intake and induce weight loss.

Most people who take Orlistat are likely to see results in the first 2 weeks of taking their first dosage.

Yes, to an extent. You are recommended to continue eating all food groups, and not to cut anything out. However, you are recommended to reduce the overall amount of fat that you consume.

For more information on what to eat while taking orlistat, click on these two resources:

• Patient Info – https://patient.info/news-and-features/orlistat-healthy-eating-guide
• NHS Public Documents – https://publicdocuments.sth.nhs.uk/pil1885.pdf

Orlistat is also known as Alli or Xenical.