Common Side Effects of Alli
Alli is a non-prescription weight loss drug. With prescription medications, the manufacturers must provide "prescribing information" that includes detailed information about side effects.
Increased frequency of bowel movements
Uncontrolled,
spontaneous bowel movements (known as fecal incontinence)
Back pain.
Many of these problems that affect the digestive tract can be avoided or reduced by decreasing the amount of fat in your diet. Because Alli decreases the absorption of fat, more fat stays in the digestive tract, causing many of the bothersome (and sometimes embarrassing) side effects. You are more likely to experience these side effects if you eat too much fat. As you continue to take the medication, you will learn how different foods and different amounts of fat will affect you. If you have consumed a meal that is high in fat and have taken Alli, you may want to prepare for possible negative effects.