Orlistat and it's kid sister alli's function in the body is to flush about 25% of the dietary fat you consume from your body through your bowel movements by binding itself to the fat and carrying it out of the body when waste is eliminated. This has been estimated by the drug's maker to translate into roughly a 150-200 calorie savings at each meal.
About one half of the patients who participated in the studies did experience gastrointestinal side effects - or discomfort, bloating, diarrhea and/or gas, in other words. And "alli" is not something to be taken if you don't plan on cutting down calories and fat in your diet either.
Indications for alli are also that the diet pill is only intended for use by those eighteen and older, and it is not recommended for individuals who have had organ transplants, as the diet aid could potentially have harmful drug interactions. The estimated monthly cost for the alli diet pill is reportedly currently between sixty and one hundred dollars.