Why Orlistat's Fat-Blocking Mechanism Makes It Effective
How Orlistat Blocks Fat Absorption in Your Body
Orlistat works through a scientifically proven mechanism - it inhibits lipase enzymes in your digestive system that normally break down dietary fat. When these enzymes are blocked, approximately one third of the fat you consume cannot be digested or absorbed into your body. This unabsorbed fat passes naturally through your digestive system and is excreted, reducing the calories your body takes in from fat. The mechanism is local to your gut - orlistat is not significantly absorbed into your bloodstream, making it different from stimulant-based treatments.
Generic Orlistat vs Branded Xenical - Same Fat-Blocking Power
Both generic orlistat 120mg and branded Xenical 120mg contain identical active ingredients and work through the same fat-absorption blocking mechanism. Generic orlistat offers excellent value at £32.99 for 84 capsules (4 weeks), reduced to £29.69 with code EDM10. Xenical branded version costs £42.99 for the same 4-week supply (£38.69 with EDM10). The clinical effect is identical - the choice comes down to personal preference and budget. Both require prescription following clinical assessment.
Why the "One Third" Mechanism Is Clinically Significant
Orlistat blocks approximately one third of dietary fat absorption - this precise mechanism has been extensively studied in clinical trials. The remaining two thirds of fat is still digested normally, meaning your body continues to absorb essential fatty acids. This balanced approach helps support weight management when combined with a reduced-calorie, lower-fat diet, without completely eliminating fat absorption. The mechanism means orlistat works best when meals contain moderate fat levels - high-fat meals may increase gastrointestinal side effects as more unabsorbed fat passes through your system.
Understanding Side Effects Through the Mechanism
Orlistat's side effects are directly linked to its fat-blocking mechanism. When approximately one third of dietary fat cannot be absorbed, it passes through your digestive system unchanged. This can cause oily stools, increased bowel movements, and oily spotting - these effects indicate the medicine is working. Keeping fat intake to approximately 15g per meal helps minimise these effects whilst maintaining orlistat's weight management benefits. Most patients find side effects reduce over time as they adapt to a lower-fat diet.
Alli 60mg - Half-Strength Fat Blocking
Alli contains 60mg orlistat - half the strength of prescription orlistat 120mg. This lower dose blocks a smaller proportion of dietary fat but typically causes milder side effects. Alli 60mg costs £54.99 for 8 weeks (£49.49 with EDM10) and doesn't require prescription. However, the 120mg prescription strength provides stronger fat-blocking action for those suitable following clinical assessment.
Order Your Fat-Blocking Treatment Today
Now you understand how orlistat blocks approximately one third of dietary fat absorption through lipase enzyme inhibition, you can make an informed choice. Complete our online clinical assessment to determine suitability for prescription orlistat 120mg or Xenical 120mg. Our UK-licensed prescribers will review your information and, if appropriate, issue a prescription dispensed by our GPhC-registered Leicester pharmacy. Use code EDM10 for 10% off every order with next day delivery available.
