Orlistat vs Xenical: Which Should You Choose?
Can Orlistat Cause Insomnia? Understanding How It Works
Sleep disturbances are not commonly associated with orlistat because it works locally in your digestive system rather than affecting your brain. Orlistat inhibits lipase enzymes in the gut to block approximately one third of dietary fat absorption. Unlike stimulant-based weight loss treatments, orlistat is not absorbed into your bloodstream in significant amounts, making sleep-related side effects uncommon.
Orlistat vs Xenical: Identical Active Ingredients
Both generic orlistat 120mg and branded Xenical 120mg contain exactly the same active ingredient at the same dose. They work identically - blocking approximately one third of dietary fat when taken with each main meal. The clinical effect is equivalent whether you choose orlistat or Xenical, as both require the same dosing: one capsule three times daily with meals containing fat.
Price Comparison: Significant Savings with Generic Orlistat
Generic orlistat offers substantial savings compared to branded Xenical. For a 4-week supply (84 capsules), orlistat costs £32.99 (£29.69 with EDM10) vs Xenical at £42.99 (£38.69 with EDM10). Over 12 weeks, you save approximately £33 by choosing generic orlistat at £86.39 vs Xenical at £116.09 (with discount code EDM10). Both require the same online clinical assessment and prescription process.
Alli 60mg: Lower-Strength Alternative
Alli 60mg provides half the dose of prescription-strength orlistat, offering a gentler option for those preferring to start with lower-strength treatment. At £49.49 for 8 weeks (with EDM10), Alli may cause fewer gastrointestinal side effects whilst still supporting weight management alongside a reduced-calorie, lower-fat diet.
Side Effects: What to Expect
The most common side effects with both orlistat and Xenical are gastrointestinal, including oily stools, increased bowel movement frequency, and abdominal discomfort. These effects are directly related to the amount of fat in your meals - keeping meals low in fat (approximately 15g per meal) significantly reduces side effects. Sleep disturbances are not commonly reported with either formulation.
How to Order: Same Process for Both Options
Whether you choose orlistat or Xenical, the ordering process is identical. Complete our online health questionnaire for review by a UK-licensed prescriber. If treatment is clinically appropriate, your prescription will be dispensed by our GPhC-registered pharmacy and delivered discreetly to your address with next-day delivery available across the UK.


