Can You Take Orlistat With Mounjaro or Wegovy?

Orlistat is a prescription or pharmacy medicine that works by blocking a portion of the fat you eat from being absorbed in the gut. Mounjaro and Wegovy work differently — they act on appetite-regulating hormones (GLP-1 receptors, and in tirzepatide's case also GIP receptors), reducing hunger signals and slowing gastric emptying.

Because these medicines target weight management through distinct pathways, there is a theoretical possibility of additive gastrointestinal effects. Orlistat commonly causes oily stools, urgent bowel movements, and digestive discomfort. GLP-1 medicines are also commonly associated with nausea, diarrhoea, and constipation. Taking both at the same time may intensify these effects for some people, though individual responses vary considerably.

There is currently limited specific clinical data on combining orlistat with tirzepatide or semaglutide. Your prescriber is the right person to weigh up the potential benefits and risks for your individual situation. The official patient information leaflets for both medicines — available via the electronic Medicines Compendium at medicines.org.uk — are a useful reference point to bring to that conversation.

Other Medicines People Commonly Ask About

Questions about combining other medicines with Mounjaro or Wegovy are common. Because GLP-1 medicines slow gastric emptying, they can affect how quickly some orally taken medicines are absorbed — which is worth discussing with your prescriber or pharmacist for any medication you take regularly.

• Paracetamol: Many people ask whether paracetamol is safe to take alongside Mounjaro. Paracetamol is widely used, but because gastric emptying is slowed, absorption timing may be altered slightly. Your prescriber or pharmacist can advise based on your specific circumstances.
• Anti-sickness tablets: Some people taking GLP-1 medicines use over-the-counter anti-nausea remedies to manage side effects. Whether these are appropriate for you is something to discuss with your healthcare professional, particularly if nausea is persistent or severe.
• Probiotics: Probiotics are generally considered low-risk supplements, and many people on Wegovy or Mounjaro use them to support gut comfort. However, if you are considering probiotics specifically to manage gastrointestinal side effects, it is still worth mentioning to your prescriber.

If you are curious about other supplements people commonly consider alongside GLP-1 medicines, see our pages on apple cider vinegar and Mounjaro and berberine and Mounjaro. If digestive changes are prompting questions about gut support, our page on laxative use on Mounjaro may also be useful.

When you are taking multiple medicines or supplements alongside Mounjaro or Wegovy, keeping a clear record of how you feel day to day becomes especially valuable. GLP Trackr's side-effect tracking feature lets you log symptoms — such as nausea, digestive discomfort, or fatigue — and view patterns over time, so you can bring a clear, organised picture to your next prescriber appointment rather than trying to recall how last Tuesday felt.

You can also use the daily check-in to note energy levels, mood, and gut comfort alongside your dose log. If you notice a pattern — for instance, symptoms worsening on certain days or alongside certain foods — that information is genuinely useful for your prescriber to review. The doctor report feature in GLP Trackr lets you export a summary of your journey specifically for those conversations.

If you want to understand more about how Mounjaro works and why these interaction questions arise, our guide on how Mounjaro works covers the mechanism in plain language.

Important: If you are experiencing severe, persistent, or worrying symptoms — including significant digestive problems — contact your healthcare professional promptly. GLP Trackr helps you record and organise what you are experiencing; it is not a substitute for clinical advice, and any decision about combining medicines should always involve your prescriber or pharmacist.

Start logging your symptoms and tracking your journey — GLP Trackr is free to try for 7 days on the App Store and Google Play.