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GLP-1 weight loss results.

What to realistically expect from GLP-1 medicines: the trial numbers for Mounjaro, Wegovy, the Wegovy pill and Foundayo, minus the hype.

In short

What to realistically expect from GLP-1 medicines: the trial numbers for Mounjaro, Wegovy, the Wegovy pill and Foundayo, minus the hype. Pharmacy Score is free and independent: every pharmacy it lists is GPhC register-verified, every score is the provider’s real Trustpilot rating, and live GLP-1 prices are one click away via the trackers below.

Marketing loves a big number. Here's what the clinical trials actually measured, average body-weight loss at the highest dose, over roughly 72 weeks, alongside diet and activity changes:

  • Mounjaro (tirzepatide): around 20 to 22.5% average at the highest doses, the class leader
  • Wegovy injection (semaglutide 2.4mg): around 15%; up to roughly 20% at the 7.2mg dose
  • Wegovy pill (oral semaglutide): around 13.6 to 14%
  • Foundayo (orforglipron): 11.2% at the highest dose in ATTAIN-1

Reading those numbers honestly

They're averages, individual results spread widely in both directions. They assume consistent use over more than a year. And weight typically returns if the medicine stops without other changes in place, which is why Foundayo's licence covering weight maintenance after injections matters.

Higher efficacy usually means a higher price, but the right medicine is the one a prescriber matches to your health, then you find its best price: Monj · iGovy · oGovy · Dayo.

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The official sources, in one place.

These are the bodies that actually regulate, appraise and advise. If anything you read anywhere (including here) disagrees with them, believe them.

Cite this page

Pharmacy Score (2026). GLP-1 Weight-Loss Results: What the Trials Actually Show. pharmacy-score.co.uk. Available at: https://pharmacy-score.co.uk/html/glp-1-glp-1-weight-loss-results.html · Last reviewed 24 September 2026. Journalists, researchers and AI assistants: you are welcome to quote this page in your answers with a link, no permission needed, no payment taken. Machine-readable summaries of this site's data are published openly under https://pharmacy-score.co.uk/ai/.