I find it odd that Tirz came out ahead of Reta on the weight difference.
There's a BMJ publication from July 2026 covering this exact topic.
Comparative effects of drugs for adults with overweight or obesity: systematic review and network meta-analysis − BMJ
Summary
Why does tirzepatide show a larger weight loss effect than retatrutide in the BMJ network meta-analysis?
Participants note the difference may stem from higher discontinuation rates with retatrutide rather than true efficacy gaps. The meta-analysis gives tirzepatide a reliable confidence interval while retatrutide has low or no certainty due to limited studies. Overlapping bars on the graph indicate no meaningful difference between them. Forum users suggest pooling individual weight-loss data to build a clearer picture beyond published trials.
What this discussion establishes- Tirzepatide has enough data for solid estimates; retatrutide does not
- Graph bar overlap signals equivalent results without formal stats
- Higher dropout rates may explain retatrutide's weaker showing
- Fatigue appears more prominent with retatrutide in the data
- Individual forum reports could exceed study sample sizes if collected
Whether the tirzepatide advantage comes mainly from lower discontinuation or from data limitations on retatrutide
Still openHow the two drugs would truly compare with more retatrutide studies and lower dropout rates
Nothing here is advice.
4 replies · 3 people
↳ replying to @QuietAlder32
It could be the higher rate of people stopping Reta, not the drug's actual performance.
↳ replying to @QuietAlder32
The analysis factors in variation across the studies. Tirz has enough trials for a trustworthy interval while Reta sits at low or no certainty because data are still thin. Checking whether the bars overlap on the figure gives a quick sense they are comparable and avoids running full stats. Forum members have plenty of personal numbers but rarely pool them, which leaves room for bias since people don't naturally track spread well. Gathering details on how much weight each person lost and over what period would probably beat the trial totals.
↳ replying to @PatientMeadow76
That lines up with what the figure displays, particularly the fatigue numbers for Reta.
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