You can find the drug orlistat under two brand names: Xenical and Alli. Xenical is a prescription drug that contains 120 milligrams of orlistat. Alli contains only 60 mg of orlistat, and you can buy it over the counter, without a prescription. Alli is a fat blocker, which means it prevents some of the fat you eat from being absorbed into your body. When you use Alli alongside a reduced-calorie diet and an exercise program, you improve your chances for weight loss.
Gastrointestinal Symptoms
The most common side effects of Alli are related to the intestines and stomach. Loose stools or diarrhea, oily spotting, gas with oil, oily stool and uncontrollable bowel movements are commonly reported among people using Alli. According to eMedTV, more than 20 percent of people using Alli experienced abdominal pain. The side effects intensify if you eat meals high in fat.
Allergic Reactions
Allergic reactions to Alli are rare, but when they do occur, they can be very serious. If you experience any form of allergic reaction, consult your doctor immediately. Serious allergic reactions include difficulty breathing, rash, swelling of the throat or tongue, tightness in the chest and hives. Upper respiratory infections and anaphylaxis are other possible severe reactions.
Other Side Effects
Most side effects of Alli are temporary and not a cause for concern. Some people experience headaches, back pain, dizziness and vomiting. A few cases of anxiety and depression have also been reported, according to Drugs.com. More rare side effects include hypertension, acute kidney injury, lower-leg edema and an increased risk of urinary tract infections. Alli might affect the liver, especially in people who suffered from liver problems prior to starting the drug. Liver-related symptoms, such as jaundice and weakness, can also occur.
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