Lilly just released some new Phase 3 results for Retatrutide, their next weight-loss jab. Mounjaro works on two hormone pathways, GLP-1 and GIP, while Retatrutide works on three: GLP-1, GIP and glucagon.
The phase 3 obesity results are good: average weight loss was 28.3% after 80 weeks on the highest dose. Nearly half the trial participants lost at least 30% of their body weight. The trial had participants on 4 mg, 9 mg, and 12 mg a week. Similar side effects to Mounjaro. It still needs regulatory submission and MHRA review before it becomes officially available in the UK.
For rough comparison:
- Wegovy: about 15% average loss
- Mounjaro/Zepbound: about 22.5%
- Retatrutide: about 28.3%
investor.lilly.com/node/54321/pdf