Alli is an over-the-counter weight loss medication intended for overweight adults. As a lipase-inhibitor, Alli blocks fat absorption in the digestive tract. Undigested fat is then excreted through your stool. According to MayoClinic.com, Alli may promote three to five pounds of weight loss per year, in addition to weight lost through dietary changes and exercise. Alli is associated with numerous side effects. To determine whether Alli is suitable for you, talk to your doctor.
Urgent Bowel Movements
While taking Alli, you may feel an urgent, potentially frequent need to pass stool. According to the Alli website, digestive side effects are most common during the first three weeks of taking the drug. If you consume more than 15 g of fat at any meal, your chance for urgent bowel movements and other digestive side effects is increased. Urgent bowel movements may make it difficult to partake in work, school or home tasks, attend social activities or sit through movies or lengthy drives.
Gas and Oily Spotting
Gas and oily spotting, also called anal discharge, may also occur while taking Alli. Though painless physically, gas and discharge may cause embarrassment. Gas and spotting are most common in the initial weeks, though they may occur at any point if you consume a high-fat meal. Taking excessive amounts of Alli can also lead to gas and oily spotting. Gas may cause bloating or stomach pain, particularly if you try to withhold it, unpleasant smells and stains in your undergarments.
Diarrhea
Alli may cause diarrhea, or loose, frequent stools. If you consume a high-fat food, such as deep-fried foods, high-fat cheese or red meat, the likelihood of experiencing diarrhea increases. Severe or persistent diarrhea can lead to dehydration, which causes weakness, fatigue and, in severe cases, electrolyte imbalances---inappropriate levels of bodily salts that help regulate heartbeat, muscle contractions and other functions. To prevent more serious side effects, such as diarrhea and dehydration, the manufacturer of Alli recommends easing your way into Alli gradually, rather than beginning with full daily dosage. Since Alli affects people differently, experiencing diarrhea while taking minimal dosage is possible.
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