Understanding Orlistat Side Effects Before Treatment
Does Orlistat Cause Diarrhoea?
Yes, orlistat may cause gastrointestinal side effects including loose stools, diarrhoea, and oily bowel movements. These effects occur because orlistat blocks approximately one third of dietary fat absorption, causing unabsorbed fat to pass through your digestive system. The likelihood and severity of these side effects directly relate to your fat intake per meal. Lower-fat meals significantly reduce the risk of diarrhoea and other gastrointestinal symptoms.
Why Orlistat Causes Digestive Side Effects
Orlistat works by inhibiting lipase enzymes in your gut that normally break down dietary fat. When these enzymes are blocked, undigested fat moves through your intestines and is naturally excreted. This mechanism explains why gastrointestinal effects are more common with high-fat meals. Generic orlistat 120mg at EverydayMeds costs £32.99 for 84 capsules (4 weeks), or £29.69 with discount code EDM10. Treatment requires clinical assessment by our UK-licensed prescribers.
Managing Orlistat Side Effects
You can minimise diarrhoea and other side effects by keeping dietary fat to approximately 15g per meal. Spread your daily fat intake evenly across three main meals rather than eating high-fat snacks. Most patients find side effects reduce over time as they adapt to a lower-fat diet. Xenical 120mg, the branded version of orlistat, causes identical side effects but costs £42.99 for 4 weeks (£38.69 with EDM10). Both contain the same active ingredient at the same strength.
Common Orlistat Side Effects Beyond Diarrhoea
Very common side effects (affecting more than 1 in 10 people) include oily or fatty stools, oily spotting on underwear, urgent need for bowel movements, increased bowel frequency, and abdominal discomfort. These gastrointestinal effects are signs the medication is working by preventing fat absorption. Alli 60mg provides a lower-strength option at £28.99 for 4 weeks (£26.09 with EDM10), potentially causing milder side effects due to the reduced dose.
When to Seek Medical Advice
Contact your prescriber if side effects are severe, persistent, or affecting your daily life. Seek immediate medical attention for severe abdominal pain, signs of liver problems (dark urine, yellowing of skin/eyes), or allergic reactions. Most side effects are manageable with dietary adjustments, but professional guidance ensures safe treatment. Our online service includes ongoing prescriber support throughout your weight management journey.
Orlistat Treatment Options at EverydayMeds
Choose from generic orlistat 120mg (most cost-effective), Xenical 120mg (branded equivalent), or Alli 60mg (lower strength). All require clinical assessment except Alli. Generic orlistat 12-week supply costs £95.99 (£86.39 with EDM10), while Xenical 12-week supply costs £128.99 (£116.09 with EDM10). Complete our online consultation for prescriber review and next-day delivery from our GPhC-registered Leicester pharmacy. Use code EDM10 for 10% off every order.
