Alli is a medication used for weight management. It contains the active ingredient orlistat, which helps prevent the absorption of fat from the food you eat. This can help you lose weight more easily.

Alli can cause side effects, including wind with or without oily spotting, sudden or more frequent bowel motions and soft stools. Not everybody experiences them, but if you do, they usually settle after a few weeks once you get used to the medication.