Xenical blocks some of the fat that you eat, keeping it from being absorbed by your body. Xenical is used to aid in weight loss, or to help reduce the risk of regaining weight already lost. This medicine must be used together with a reduced-calorie diet and is to used only by adults. Xenical Dosage Recommended Dosing The recommended dose of XENICAL is one 120-mg capsule three times a day with each main meal containing fat (during or up to 1 hour after the meal). The patient should be on a nutritionally balanced, reduced-calorie diet that contains approximately 30% of calories.Xenical Side Effects Serious side effects Other side effects Professional info Note: This document contains side effect information about orlistat. Some dosage forms listed on this page may not apply to the brand name Xenical. Applies to orlistat: oral capsule .Xenical Alternatives Compared View side-by-side comparisons of medication uses, ratings, cost, side effects and interactions. Xenical Phentermine Topiramate Enter another drug to compare View side-by-side comparisons of medication uses, ratings, cost, side effects and interactions.