alli works by preventing the absorption of some of the fat you eat and so as a result of the way it works, you may notice an effect on your bowel movements. These effects are related to your diet and if you stick to your fat targets they should be manageable. However, if you eat too much fat, these changes are more likely and may include wind, with or without oily spotting, fatty or oily stools, or sudden bowel motions.
It is important to remember that these diet-related treatment effects are largely due to what you eat. If you stick to your recommended fat targets, you are less likely to have any problems.
In a 3-month study of alli use, less than 9% of subjects on alli dropped out due to these effects. In fact, many users have told us that the effects were a signal that the capsules were working and helped them maintain healthier eating patterns.
All medicines can have side effects so you should check with your pharmacist or doctor if anything unusual or severe occurs when using alli. If you want to report a side effect you think is associated with alli, click here.
The alli programme is here to help you adopt a healthy lifestyle. The website provides online support, useful tools, tips and lower-fat recipes to help you stay motivated and on track.
