Alli is the low-dose, over-the-counter version of the prescription diet aid orlistat. This product claims to help you lose weight if you follow a low-fat, low-calorie diet and accompany this with an exercise regimen. Since Alli is marketed as a weight loss product, many people expect to see fast results. Understanding how Alli works can help you determine when you may see results and what to expect from using Alli.
Effects
The first time you take Alli, the drug begins to work in your body. You take one capsule an hour before you eat a meal that contains fat; you should keep the fat content in each meal to no more than 15 g. Alli prevents your body from absorbing all of the fat in your meal, and this may help reduce the amount of calories you absorb.
Weight Loss
Any weight loss from Alli may take time to notice. In fact, according to MayoClinic.com, using Alli may only increase your weight loss by around 5 lbs. in one year of use, when accompanied by a low-fat diet and exercise. At this rate of loss, you may have a difficult time noticing any substantial difference between a diet and exercise program that includes Alli and the same program that does not include Alli use.
Bowel Movements
One common effect of Alli is a change in bowel movement habits. These changes often occur within a week of beginning the drug. You may experience a change in the frequency of your bowel movements, and you may also notice a change in color. If you have light-colored stools, or if you experience frequent or uncontrolled loose stools, stop taking Alli and contact your doctor.
Side Effects
From your first dose of Alli, you may also experience side effects. These effects, which Alli refers to as "treatment effects," may result in abdominal discomfort, loose stools and gas with oily spotting. Some people may experience more severe effects, and this may include vomiting, weakness, skin discoloration and difficulty breathing.
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