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Published 12:11 23 Aug 2026 BST
Updated 12:08 23 Aug 2026 BST

Retatrutide, a weight-loss drug not approved for human use anywhere in the world, is being sold online and passed around Irish gyms, and hospitals here are treating people who have taken it.
A leading obesity consultant has warned of a rise in patients presenting with side effects, RTÉ News reports.
Often shortened to “reta”, the drug is an injectable peptide in clinical trials with Eli Lilly.
It cannot be sold lawfully anywhere, yet it is traded online and on social media, and has caught on with gym-goers chasing a leaner physique faster.
Common side effects include nausea, vomiting, diarrhoea and constipation, and it can affect the liver, pancreas and kidneys.
Professor Donal O’Shea said trainers are handing it out with no warning about what follows.
“We had somebody in at the weekend who was getting Retatrutide twice a week in the gym from their personal trainer, and they were in hospital with vomiting and kidney disease," said O'Shea.
Some patients will not admit to it, he added: “They are too embarrassed to say they are taking it, leaving us blindfolded.”
Online fitness coach Shauna Louise Cleary began injecting twice a week in February, ahead of a gym photoshoot in Marbella.
“Within half an hour of me injecting I would start to get sick, and I wouldn’t be able to stand,” she said. She was eating under 500 calories a day and could not keep food down.
She stopped after upping her dose. “I nearly collapsed in the gym and that was when I decided to come off it, because my body just rejected it,” she said.
Read more on dramatic weight loss and the latest Irish news.
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