How Orlistat's Fat-Blocking Action Drives Results
The Science Behind Orlistat's Fat-Blocking Mechanism
Orlistat works through a targeted mechanism that acts locally in your digestive system. As a lipase inhibitor, it blocks the enzymes responsible for breaking down dietary fat. When these lipase enzymes are inhibited, approximately one third of the fat you eat cannot be digested or absorbed into your body. This unabsorbed fat passes naturally through your digestive system, reducing the calories absorbed from fatty meals.
Unlike appetite suppressants that act on the brain, orlistat works directly in your gut without being significantly absorbed into your bloodstream. This localised action makes it effective whilst maintaining a targeted approach to weight management support.
Alli 60mg vs Orlistat 120mg: Potency Comparison
The key difference between Alli and prescription orlistat lies in their strength. Alli contains 60mg orlistat per capsule, whilst prescription orlistat and Xenical contain 120mg - exactly double the dose. This means prescription-strength orlistat blocks a greater proportion of dietary fat compared to the lower-strength Alli option.
Orlistat 120mg (generic) offers the most cost-effective option at £32.99 for 84 capsules (4-week supply), reduced to £29.69 with code EDM10. Xenical 120mg provides the same clinical effect as a branded option for £42.99 (£38.69 with EDM10). Alli 60mg costs £28.99 for 42 capsules (4-week supply at lower strength), or £26.09 with EDM10.
Why the Mechanism Matters for Your Weight Management
Understanding orlistat's fat-blocking action explains why it must be combined with a reduced-calorie, lower-fat diet. When you eat meals containing fat, orlistat prevents approximately one third from being absorbed. The remaining two thirds is still digested normally, which is why keeping fat intake moderate (around 15g per meal) optimises both effectiveness and tolerability.
This mechanism also explains the gastrointestinal side effects some people experience. These effects occur because unabsorbed fat passes through your system - they're actually a sign the medicine is working. Keeping meals low in fat significantly reduces these side effects whilst maintaining orlistat's weight management support.
Clinical Assessment and Prescription Process
Orlistat 120mg and Xenical 120mg require prescription following clinical assessment by a UK-licensed prescriber. Our online consultation process reviews your medical history, current medications, and BMI to determine suitability. Generally, orlistat may be prescribed for adults with BMI 30+ or BMI 28+ with weight-related health conditions like type 2 diabetes or high blood pressure.
The assessment takes minutes to complete online, with prescriber review typically completed same day. If approved, your medication is dispensed by our GPhC-registered Leicester pharmacy and dispatched with next-day delivery across the UK.
Choosing Your Orlistat Strength and Supply
For prescription strength, choose between generic orlistat 120mg (best value) or branded Xenical 120mg (identical clinical effect). Both require three capsules daily with main meals containing fat. Our pack sizes offer flexible treatment duration: 42 capsules (2 weeks), 84 capsules (4 weeks), 168 capsules (8 weeks), or 252 capsules (12 weeks).
Alli 60mg offers a lower-strength option without prescription requirement, though it provides less fat-blocking potency. All three options work through the same proven mechanism - the difference is strength and therefore clinical effect.
Ready to start? Complete your online consultation today and discover how orlistat's proven fat-blocking mechanism can support your weight management goals. Use code EDM10 for 10% off your order.
