Alli, also known under the name orlistat, is a popular over-the-counter weight loss supplement based off of the prescription weight loss medication Xenical. Alli works by blocking an estimated 25 percent of the dietary fat you consume from being absorbed into the body, reducing fat from being stored on the body. However, before taking Alli, it's important to understand the possible risks of the medication.
Bowel Movements
One common risk of the Alli weight loss supplement is a change in bowel movements, most noticeably an urgent case of diarrhea. Bowel movements may also become more frequent and loose, states Drugs.com. The manufacturers of Alli refer to these side effects as "treatment effects."
Bowel Accidents
Treatment effects may also include a loss of bowel control, especially when trying to pass gas. Oily spotting may also occur due to the extra blocked fats passing through the digestive system. These effects can be limited by following a controlled low-calorie and low-fat diet, states the official MyAlli.com website. Typically this consists of limiting fat intake per meal to below 15 grams.
Liver Damage
In rare cases, severe liver injury may be associated with taking Alli or its prescription counterpart Xenical. In 2009, the Food and Drug Administration confirmed 13 total reports of severe liver injury for Alli and 12 for the prescription strength Xenical. MayoClinic.com recommends reporting any signs of liver problems to your doctor including a combination of fatigue, weakness, fever, jaundice or brown urine.
Allergic Reaction
In rare cases, Alli may also cause moderate to severe allergic reactions. Signs of a moderate reaction include hives, rash and itching, to more severe side effects such as difficulty breathing, dizziness, tightness of the chest and swelling of the mouth, throat, tongue or face. Regardless of the severity of the reaction, you should contact your doctor. With severe reactions seek immediate medical attention.
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