Wegovy (semaglutide) and Mounjaro (tirzepatide) are both once-weekly injections that help most people to lose weight. However, they have different active ingredients. In Wegovy, the active ingredient is semaglutide and in Mounjaro the active ingredient is tirzepatide. Orlistat, unlike Wegovy and Mounjaro, comes in the form of a pill that is taken up to three times a day, every day. Wegovy is used solely for weight loss and works by mimicking a single hormonal receptor (GLP-1) which slows down gastric emptying, making you feel fuller for longer. Mounjaro activates both the GLP-1 receptor as well as the GIP receptor, which promotes energy storage. Mounjaro is used for both weight loss and for managing type 2 diabetes. Both GIP and GLP-1 receptors are expressed in the areas of the brain important for appetite regulation. Orlistat works in the stomach and intestines by blocking the enzymes (lipases) that break down dietary fats. This in turns prevents a percentage of the fats you've eaten (approximately one-third) from being absorbed into the body. Instead, this undigested fat is excreted with your stools. This ultimately creates a calorie deficit that aids in weight loss. Because Wegovy and Mounjaro are different medications, this also means that their starting, escalation doses and maintenance are different. They also have different manufacturers: Wegovy is made by Novo Nordisk, whilst Mounjaro is made by Eli Lilly. Orlistat is available in the UK in two different dose strengths depending on patient eligibility: a 60mg Pharmacy Medication and a 120mg Prescription Only Medication. However, there is no escalation process; patients start and maintain on the same dose for the duration of their treatment. This service only offers the 60mg dose of Orlistat, which is made by Haleon UK Trading Limited. If you want a deeper breakdown, read our Wegovy vs Mounjaro comparison guide.