Why Understanding Orlistat's Mechanism Matters
How Orlistat Blocks Fat Absorption
Orlistat works through a scientifically proven mechanism that inhibits lipase enzymes in your digestive system. These enzymes normally break down dietary fat so it can be absorbed into your body. When orlistat blocks these enzymes, approximately one third of the fat you eat cannot be digested or absorbed. This unabsorbed fat passes naturally through your digestive system, reducing the calories your body absorbs from dietary fat.
Why This Mechanism Works for Weight Management
Understanding how orlistat works explains why it can support weight loss when used alongside a reduced-calorie, lower-fat diet. By blocking approximately one third of dietary fat absorption, orlistat helps reduce your calorie intake from fat. This mechanism works the same whether you choose generic Orlistat 120mg (4-week supply £32.99, £29.69 with EDM10), branded Xenical 120mg (4-week supply £42.99, £38.69 with EDM10), or Alli 60mg (4-week supply £28.99, £26.09 with EDM10).
Local Action in the Gut
Orlistat acts locally in your digestive system rather than being absorbed into your bloodstream in significant amounts. This targeted action means the medication works directly where dietary fat is processed. The lipase inhibition occurs each time you take a capsule with a meal containing fat, making the effect directly related to your dietary fat intake.
Comparing Mechanisms Across Strengths
All orlistat products work through the same lipase inhibitor mechanism. Prescription Orlistat 120mg and Xenical 120mg contain identical active ingredients and block the same amount of fat absorption. Alli 60mg uses the same mechanism but at half the dose, blocking a smaller proportion of dietary fat. The mechanism proves the medication works - now you know how, you can choose the right strength following clinical assessment.
Supporting Your Weight Management Programme
The mechanism of blocking approximately one third of dietary fat absorption works best when combined with a structured approach to weight management. This includes a reduced-calorie, lower-fat diet and increased physical activity. Understanding that orlistat doesn't block all fat - just approximately one third - helps explain why dietary changes remain essential for successful weight management.
Start Your Treatment Today
Now you understand how orlistat's proven fat-blocking mechanism works, you can make an informed decision about your weight management approach. Complete our online clinical assessment to see if prescription Orlistat 120mg, Xenical 120mg, or Alli 60mg is suitable for you. Get 10% off every order with code EDM10, with next-day delivery from our GPhC-registered pharmacy in Leicester.


