Orlistat works by preventing about 30% of the dietary fats you eat from being digested. The undigested fat is not absorbed and is passed out of your digestive system with your bowel movements. Specifically, orlistat prevents the enzyme lipase in the digestive tract from breaking down the fats so pass through the body unabsorbed.
This helps you avoid gaining weight by preventing the intake of excess fats and assists in lowering overall calorie intake. This alone is not enough to lose weight. To lose weight your body must consume more energy than you take in through food and drinks. Xenical helps to tip the balance by lowering daily calorie intake so you remain at a calory deficit. This is what results in weight loss.
Every medication has the possibility of causing side effects, some are more common than others. Sticking to a low-fat diet will significantly reduce the number of side effects you will experience on Xenical.
Common Xenical side effects include: Fatty or oily stools, Needing the toilet urgently, Passing stools frequently, Oily discharge from your rectum (you may have oily spots on your underwear), Flatulence (wind), Stomach pain or discomfort, Headaches
The majority of these side effects are mild and generally happen at the start of treatment. Usually, these side effects subside after continuing treatment with a healthy diet. Some of these side effects are more common if a dose is taken with a very high-fat meal. Side effects may vary from one person to the next, as with any medication. You should always read the manufacturer’s Patient Information Leaflet (PIL) before taking this or any other medication.
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