How Orlistat Works: Does It Make You Feel Sick?

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Understanding how orlistat works helps explain why some people experience digestive side effects. Orlistat blocks approximately one third of dietary fat absorption in your gut, allowing unabsorbed fat to pass through naturally. This mechanism can cause gastrointestinal effects, particularly with high-fat meals. At EverydayMeds, generic orlistat 120mg starts from just £15.20 for 2 weeks with code EDM10. Our UK-licensed prescribers assess your suitability following an online consultation. Once you understand the science behind orlistat's fat-blocking action, you'll see why it's an effective weight management tool alongside a lower-fat diet.

  • Blocks approximately one third of dietary fat from being absorbed
  • Works locally in your gut - not absorbed into bloodstream
  • Side effects prove the medication is working effectively
  • UK prescription from £15.20 with 10% off code EDM10
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*Pricing shown in some areas of this page may not be up to date. Please refer to the “Our Pricing Table” or the price shown after your consultation for the latest live pricing.

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Why Understanding Orlistat's Mechanism Matters

How Orlistat Blocks Fat Absorption

Orlistat works by inhibiting 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. This unabsorbed fat passes naturally through your digestive system and is eliminated from your body.

Generic orlistat 120mg costs just £29.69 for a 4-week supply with code EDM10, making it the most cost-effective way to access this proven fat-blocking mechanism.

Why Some People Feel Sick on Orlistat

The gastrointestinal effects people experience - including nausea, oily stools, and abdominal discomfort - are actually evidence that orlistat is working. When you eat a meal containing fat, orlistat prevents approximately one third of that fat from being absorbed. The unabsorbed fat can cause digestive symptoms, especially if you eat high-fat meals.

These side effects can be significantly reduced by keeping your fat intake low - approximately 15g of fat per meal. This is why orlistat works best alongside a reduced-calorie, lower-fat diet.

Orlistat vs Xenical - Same Mechanism, Different Prices

Both generic orlistat 120mg and branded Xenical 120mg contain the same active ingredient and work through the identical fat-blocking mechanism. The clinical effect is the same - both block approximately one third of dietary fat absorption. The key difference is cost:

Generic orlistat 120mg: £29.69 for 4 weeks (with EDM10)
Xenical 120mg: £38.69 for 4 weeks (with EDM10)

You save approximately £9 per month by choosing generic orlistat while getting the same fat-blocking action. Both require a prescription following clinical assessment by our UK-licensed prescribers.

Alli 60mg - Lower Dose, Milder Effects

Alli contains 60mg orlistat - half the prescription strength. This lower dose blocks a smaller proportion of dietary fat, which typically means milder side effects. However, the weight management effect is also reduced compared to prescription-strength orlistat 120mg.

Alli 60mg costs £26.09 for 4 weeks with code EDM10. While no prescription is required, many people prefer prescription-strength orlistat 120mg for more effective fat blocking.

Getting Orlistat Through EverydayMeds

Our GPhC-registered pharmacy makes accessing orlistat simple through an online clinical assessment. A UK-licensed prescriber reviews your information and issues a prescription where clinically appropriate. We offer:

2-week supply (42 capsules): £15.20 with EDM10
4-week supply (84 capsules): £29.69 with EDM10
8-week supply (168 capsules): £57.59 with EDM10
12-week supply (252 capsules): £86.39 with EDM10

All orders include next-day delivery and discreet packaging. Now that you understand how orlistat's fat-blocking mechanism works - and why it can cause digestive effects - you can make an informed decision about treatment. Complete your assessment today and get orlistat delivered tomorrow.

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