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Xenical is a prescription formulation of the drug orlistat, which is designed to help a person lose weight or keep weight gain from returning. It inhibits the action of enzymes that break down fat, causing the body to absorb less of it.
You can get extremely sick, or your conditions can worsen. You should always have a docter check it before you use it because there is an expiration date for a reason. It can lose its efficacy, so it will not work as well.Also chemical changes can take place in medicine that can lead to poisoning & illness.