Xenical® (Orlistat) - Prescription Information
Safe use guidance, side effects, and how to get a prescription locally.
An adjunct to diet for managing obesity in eligible adults.
How Xenical Works and Key Benefits
Xenical® (orlistat) reduces dietary fat absorption by inhibiting pancreatic lipases. Taken with main meals containing fat, it blocks about 25-30% of fat calories from being absorbed, aiding weight loss when combined with a reduced-calorie diet and exercise. Typical candidates include adults with a BMI of 30 or above, or 27 with obesity-related conditions. Expect modest weight loss over months; results vary. It is not an appetite suppressant and works best alongside lifestyle changes. Regular monitoring and realistic goals improve long-term outcomes.
Blocks dietary fat absorption
Must follow low-fat diet
Take with main meals
Suitable for eligible adults
We can advise on prescriptions and provide follow-up support.
Getting a Prescription and Pharmacy Support
To obtain Xenical you usually need a prescription from your GP or an approved clinician. Pharmacies can dispense, advise on administration, and explain common side effects. Before starting, clinicians review medical history, current medications, and suitability — for example, pregnancy, malabsorption syndromes, and certain drug interactions make Xenical unsuitable. Pharmacists can discuss how to take the medicine, what to expect, and when to seek medical attention. If prescribed, follow-up appointments help assess effectiveness, side effects, and the need for vitamin supplementation, as orlistat can reduce absorption of fat-soluble vitamins.
Simple dosing rules improve effectiveness and reduce side effects.
Taking Xenical Safely
Xenical is taken orally with each main meal that contains fat, or up to one hour after the meal. Skip the dose if you miss the meal or the meal contained no fat. Common gastrointestinal effects include oily or loose stools, flatulence with discharge, and urgent bowel movements; these are usually related to dietary fat intake. Starting on a lower-fat diet and spreading fat across meals lowers these effects. Always follow your clinician’s instructions and read the patient leaflet for full guidance on storage, dosing, and interactions.
Prescription Required
Xenical is prescription only; consult your clinician.
Pharmacist Advice
We provide dosing, side-effect and interaction guidance.
Lifestyle Support
Diet and exercise are essential for success.
Quick local service for prescriptions and advice.
Local Availability and Next Steps
If you have a prescription for Xenical, our pharmacy team in Edgware can dispense it and offer private consultations on administration and managing side effects. No prescription? Speak to your GP or a prescriber for an assessment. We recommend regular reviews of weight and any symptoms while taking orlistat. If you experience severe abdominal pain, persistent or bloody stools, or signs of an allergic reaction, stop the medicine and seek urgent care.
Quick Safety and Use Points
Safety considerations include monitoring for gastrointestinal symptoms and ensuring adequate intake of fat-soluble vitamins (A, D, E, K) — supplementation may be recommended if long-term treatment is needed. Rarely, severe liver injury has been reported; stop and seek medical advice if you develop jaundice or unexplained lethargy. Discuss all current medications with the prescriber because interactions (for example with ciclosporin) can occur. Xenical is not recommended for pregnant or breastfeeding women. Always follow medical advice and report unexpected symptoms promptly.
Take with meals containing fat
May reduce vitamin absorption
Report severe abdominal pain
Not for use during pregnancy
Frequently Asked Questions
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What is Xenical and how does it work?
Xenical (orlistat) reduces absorption of dietary fat by inhibiting pancreatic lipase, helping with weight loss when combined with diet and exercise.
Who can take Xenical?
Adults with BMI ≥30, or ≥27 with obesity-related conditions, after assessment by a clinician; not suitable in pregnancy or certain health conditions.
What are common side effects?
Common effects are oily or loose stools, flatulence with discharge, and urgency—usually related to dietary fat intake and often improve with a low-fat diet.
Do I need vitamin supplements?
Orlistat can reduce absorption of fat-soluble vitamins; your clinician may advise a daily multivitamin taken at a different time of day.
How do I get a prescription locally?
Speak to your GP or an authorised prescriber for assessment. Once prescribed, the pharmacy can dispense and provide counselling.