Xenical

Xenical contains orlistat, a lipase inhibitor prescribed for weight management in adults with a body mass index (BMI) of 30 or above, or a BMI of 27 or above with additional weight-related risk factors. Rather than suppressing appetite or altering brain chemistry, orlistat works directly in the gut by preventing the absorption of approximately one third of the fat consumed in each meal.

The unabsorbed fat passes through the digestive system and is excreted in the stool. This mechanism makes Xenical most effective when used as part of a comprehensive weight-management programme that includes a balanced, reduced-calorie diet with moderate fat content and regular physical activity.

How to Take Xenical

Take one 120 mg capsule with water immediately before, during, or up to one hour after each main meal. If a meal is missed or contains no fat, the dose should be skipped. The medication should be used in conjunction with a nutritionally balanced, mildly hypocaloric diet in which approximately 30 per cent of calories come from fat.

A daily multivitamin supplement, taken at bedtime or at least two hours after the last Xenical dose, is recommended to compensate for the potential reduced absorption of fat-soluble vitamins (A, D, E, and K).

The standard dose is one 120 mg capsule three times daily with meals. There is no benefit to taking a higher dose. If you have not lost at least 5 per cent of your body weight after 12 weeks of treatment, consult your prescriber, as continued use may not be appropriate. Treatment duration typically ranges from 6 to 12 months, though longer courses may be considered under medical supervision.

Common Side Effects

The side effects of Xenical (orlistat) are primarily gastrointestinal and are directly related to its mechanism of action:

• Oily or fatty stools
• Oily spotting on underwear
• Increased frequency of bowel movements
• Flatulence with discharge
• Urgent need to open the bowels

These effects are more pronounced when dietary fat intake is high and serve as a practical incentive to adhere to a low-fat diet. They typically diminish as patients learn to moderate their fat consumption. Rarely, severe liver injury has been reported; seek medical advice if you develop yellowing of the skin or eyes, dark urine, or persistent abdominal pain.

Orlistat may reduce the absorption of fat-soluble vitamins and certain medications, including oral contraceptives, anticoagulants (warfarin), ciclosporin, and levothyroxine. If you take any of these, discuss timing and potential dose adjustments with your prescriber.

Maintaining a diet with more than 30 per cent of calories from fat will significantly increase gastrointestinal side effects. Distributing fat intake evenly across meals, rather than consuming a large amount in a single sitting, helps minimise discomfort.

Xenical is contraindicated in patients with chronic malabsorption syndrome, cholestasis (impaired bile flow), and during pregnancy. It should not be used by individuals with a known allergy to orlistat or any component of the capsule. Breastfeeding women should not take orlistat, as it is unknown whether it passes into breast milk.