
Ten Britons dead after developing worrying side effects to popular fat jabs as medicines watchdog investigates why this is happening
Ten Britons have died after complaining of side effects from fat jabs, sparking an urgent probe into the safety of weight-loss drugs.
The Medicines and Healthcare products Regulatory Agency (MHRA) said it was investigating after hundreds developed pancreatitis after using the jabs.
The MHRA is examining whether those affected have a genetic trait that is leaving them at a greater risk of side effects from the likes of Mounjaro, Wegovy and Ozempic.
The medicines watchdog said it has received more than 560 reports of patients developing an inflamed pancreas after taking GLP-1 injections since they were first launched. Ten cases proved fatal.
These drugs are typically known as 'fat jabs' or 'skinny jabs' as they are frequently used for weight management, but many are primarily licensed for the treatment of type 2 diabetes.
The MHRA is now calling for users who are admitted to hospital with pancreatitis to report the side effect to authorities using the regulator's Yellow Card scheme. Healthcare workers can also submit a report on patients' behalf.
When a Yellow Card report is received, the MHRA will contact patients to ask if they would be willing to take part in the new Biobank study in collaboration with Genomics England.
This would involve sharing more information and sending a saliva sample to explore whether genetic make-up puts patients at a higher risk of acute pancreatitis on GLP-1 jabs.
Researchers hope this will ultimately enable doctors to use rapid genetic screening tests before prescribing drugs to make the process safer.
Side effects continue to be a significant burden on the NHS and studies have shown they account for roughly 6.5 per cent of all hospital admissions in the UK.
The main symptom of pancreatitis is severe pain in the stomach that radiates to the back and does not go away. Anyone who experiences this should seek immediate medical help.
Dr Alison Cave, MHRA's chief safety officer, said: 'Evidence shows that almost a third of side effects to medicines could be prevented with the introduction of genetic testing. It is predicted that adverse drug reactions could cost the NHS more than £2.2billion a year in hospital stays alone.
'Information from the Yellow Card Biobank will help us to better predict those most at risk of adverse reactions - enabling patients across the UK to receive the safest medicine for them, based on their genetic makeup.
'To help us help you, we're asking anyone who has been hospitalised with acute pancreatitis while taking a GLP-1 medicine to report this to us via our Yellow Card scheme.
'Even if you don't meet the criteria for this phase of the Biobank study, information about your reaction to a medication is always extremely valuable in helping to improve patient safety.'
Recent estimates suggest that about 1.5million patients in the UK are taking weight loss jabs, many of which are bought privately due to NHS rationing. Health officials have suggested that they can help to turn the tide on obesity, but have stressed they are not a silver bullet and do come with side effects.
Most side effects linked to the jabs are gastrointestinal including nausea, constipation and diarrhoea. However, the medical regulator recently warned that Mounjaro may make the oral contraceptive pill less effective in some patients.
The MHRA said it has been notified of 181 cases of acute and chronic pancreatitis linked to tirzepatide - the active ingredient in Mounjaro. Of these, five people died.
There have been 116 reported reactions of this kind linked to liraglutide, one of which was fatal, and 113 cases of acute and chronic pancreatitis linked to semaglutide - the active ingredient in Ozempic and Wegovy, with one death.
Some 101 reported reactions of this kind are linked to exenatide, with three deaths, and 52 reported reactions of this sort linked to dulaglutide and 11 reported reactions to lixisenatide.
There were no reported fatalities from pancreatitis linked to the last two drugs.
There have been further reactions and deaths linked to other side-effects following the use of GLP-1 medicines.
The MHRA stresses that it has not been established that the jabs caused the illnesses, but that the patients themselves have reported them as side effects.
Professor Matt Brown, chief scientific officer of Genomics England, said: 'GLP-1 medicines like Ozempic and Wegovy have been making headlines, but like all medicines there can be a risk of serious side effects.
'We believe there is real potential to minimise these with many adverse reactions having a genetic cause.
'This next step in our partnership with the MHRA will generate data and evidence for safer and more effective treatment through more personalised approaches to prescription, supporting a shift towards an increasingly prevention-focused healthcare system.'

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Weight loss and diabetes jabs taken by more than a million people in the UK have been linked to a potential serious side effect, with some deaths, according to data from the UK medicines regulator. New figures from the Medicines and Healthcare products Regulatory Agency (MHRA) show the group of drugs that includes Mounjaro, Wegovy, and Ozempic may be associated with inflammation of the pancreas. According to the MHRA, there have been 181 reported cases of acute or chronic pancreatitis linked to Mounjaro, with five deaths. Wegovy and Ozempic have been linked with 113 reports of pancreatitis and one death. Other, less widely used versions of so-called GLP-1 drugs have also been linked to cases and deaths. There is no evidence that the drugs directly caused the deaths. And the evidence isn't strong enough for the MHRA to restrict access. 1:31 That's because pancreatitis also occurs in people who aren't taking the GLP-1 drugs, with about 560 cases for every one million people in the general population. Gallstones and alcohol are the biggest causes. But the MHRA and Genomics England are launching a new study to see whether some people have genes that put them at higher risk of developing pancreatitis if they take GLP-1 drugs. People reported through the MHRA's 'yellow card' alert system to have pancreatitis while using the jabs will be asked to provide a saliva sample and their genes tested. Professor Matt Brown, chief scientific officer of Genomics England, said: "GLP-1 medicines like Ozempic and Wegovy have been making headlines, but like all medicines, there can be a risk of serious side effects. "We believe there is real potential to minimise these, with many adverse reactions having a genetic cause. "This next step in our partnership with the MHRA will generate data and evidence for safer and more effective treatment through more personalised approaches to prescription." The main symptoms of pancreatitis are severe pain in the centre of the tummy area, fever and nausea. Acute cases are treated in hospital with fluids and oxygen, and generally make a recovery within a few days. But there can be complications, and around 5% of acute cases are fatal. With all medicines, there is a balance of risk and benefit. For people with type 2 diabetes or obesity, there are clear benefits to using the jabs. They lower blood sugar levels, lead to rapid weight loss and reduce deaths from cardiovascular disease by a fifth. But for people who are a bit overweight and have sourced the jabs privately to lose a few pounds ahead of their summer holiday, the health benefits are far less clear. This is a wake-up call for them. These are powerful medications with effects not just on appetite, but on lots of body organs, including the brain. And pancreatitis is just one of many possible side effects. Lilly, the UK manufacturer of Mounjaro, has said patient safety is its "top priority". The drug's patient information leaflet "warns that inflamed pancreas (acute pancreatitis) is an uncommon side effect (which may affect up to 1 in 100 people)," the statement continued. Lily "also advises patients to talk to their doctor or other healthcare professional before using Mounjaro if they have ever had pancreatitis," it added.