Ready to Start? Compare Your Orlistat Options
How Orlistat's Fat-Blocking Mechanism Works
Orlistat works through a precise biological mechanism that targets lipase enzymes in your digestive system. These enzymes are responsible for breaking down dietary fat into smaller molecules that can be absorbed. When you take orlistat 120mg with a meal, it inhibits approximately one third of these lipase enzymes, preventing the corresponding fat from being digested and absorbed into your body.
This unabsorbed fat passes naturally through your digestive system and is eliminated, effectively reducing the calorie intake from dietary fat by roughly one third. The mechanism is localised to your gut - orlistat isn't significantly absorbed into your bloodstream, making it fundamentally different from systemic weight loss medications.
Why This Mechanism Proves Orlistat Works
The fat-blocking action of orlistat provides visible proof the medication is working. When following a reduced-calorie, lower-fat diet alongside orlistat treatment, many patients notice changes in bowel movements that confirm the mechanism is active. This isn't just theoretical - you can see that approximately one third of dietary fat is being blocked rather than absorbed.
Generic orlistat 120mg delivers this proven mechanism from just £15.20 for a 2-week supply (with code EDM10), while branded Xenical 120mg offers the identical fat-blocking action from £19.35. Both require prescription following clinical assessment by our UK-licensed prescribers.
Orlistat vs Xenical vs Alli: Same Mechanism, Different Strengths
All three products work through the same lipase-inhibiting mechanism, but at different potencies. Orlistat 120mg and Xenical 120mg contain identical active ingredients and block approximately one third of dietary fat absorption. Alli 60mg contains half the dose, providing a lower-strength option that blocks a smaller proportion of dietary fat.
For maximum fat-blocking effectiveness, choose orlistat 120mg (£29.69 for 4 weeks with EDM10) or Xenical 120mg (£38.69 for 4 weeks with EDM10). Alli 60mg costs £26.09 for 4 weeks with EDM10 and may suit those preferring gentler effects.
Getting the Most from Orlistat's Mechanism
Understanding how orlistat works helps you optimise results. Take one 120mg capsule with each main meal containing fat - the medication can only block fat that's present. If you skip a meal or eat a fat-free meal, you can skip that dose. Spreading your daily fat intake evenly across three meals (approximately 15g fat per meal) maximises the blocking effect while minimising gastrointestinal side effects.
The mechanism works best alongside a structured approach to eating. Orlistat blocks approximately one third of fat calories, but you still absorb the remaining two thirds plus all carbohydrate, protein and alcohol calories. This is why combining orlistat with a reduced-calorie, lower-fat diet is essential for effective weight management.
Order Your Orlistat Treatment Today
Now you understand exactly how orlistat's fat-blocking mechanism works, you can choose the right option for your needs. Our online clinical assessment takes minutes to complete, and our UK-licensed prescribers will review your suitability for treatment. We offer next-day delivery across the UK from our GPhC-registered pharmacy in Leicester, with 10% off every order using code EDM10.
