There are many weight loss pills out there. Take extra caution, though, because these weight loss pills are not something you can take at will. You have to submit yourself to an accurate health assessment in order for the doctor or health professional to determine which brand or kind of diet pills would be suitable for your needs. One popular brand that is known in the world of dieters is Xenical, known likewise as “Orlistat” in other parts of the world. Xenical works to prevent your body from digesting and absorbing most dietary fats. It is claimed that this diet pill works best for people with mildly low-fat diet, because if you have a high-fat diet, you will experience undesirable side effects like loose bowel movements and discomfort. Xenical is available only upon prescription, and an individual should not be allowed to take it without consulting a doctor or health professional qualified to determine the suitability of this pill to him.