GLP-1 jabs and pancreatitis: the one symptom worth knowing
The MHRA has strengthened its acute pancreatitis warning for GLP-1 jabs like Ozempic and Mounjaro: the one symptom to act on fast if you take one.
If you take a GLP-1 jab (such as Ozempic or Mounjaro) alongside your insulin, UK regulators have strengthened a warning about a rare but serious side effect: acute pancreatitis, which is sudden inflammation of the pancreas. The one thing worth knowing is the warning sign, so you can act quickly if it happens. GLP-1 medicines are not a treatment for type 1, but a growing number of people with type 1 take one as well as insulin, so this warning applies to them too.
- On 29 January 2026 the MHRA (the UK’s medicines regulator) strengthened its warning that GLP-1 medicines can, rarely, cause acute pancreatitis (sudden inflammation of the pancreas).
- The warning sign to know is severe, persistent tummy pain that can spread to your back, often with feeling sick or being sick.
- These jabs are not a type 1 treatment, but some people with type 1 take one alongside insulin, for example to help with weight.
- This is awareness, not a reason to start, stop or change any medicine on your own. Those decisions belong with the team who prescribed it.
- If that kind of severe stomach pain happens, it needs urgent medical help, not a wait-and-see.
What the MHRA actually said
The update strengthens existing warnings about acute pancreatitis for GLP-1 medicines and the newer dual-acting type (the ingredients semaglutide and tirzepatide, sold as brands like Ozempic and Mounjaro). It followed 1,296 UK reports of pancreatitis linked to these medicines up to October 2025, including rare reports of severe, tissue-destroying and even fatal cases. It helps to keep this in proportion: against the very large number of people taking these jabs, pancreatitis is uncommon. But it is serious when it happens, which is why the regulator wants the symptom widely known rather than missed.
What this means if you have type 1
GLP-1 jabs are not licensed to treat type 1, but some people with type 1 are prescribed one alongside their insulin, so the practical value here is simply knowing the sign and acting on it early. It is also worth remembering that any medicine taken alongside insulin can change how your glucose behaves, so starting, changing or stopping one is always a team decision rather than something to do off the back of a headline. If you are ever unwell, your team can advise whether anything about your medicines needs adjusting, and that guidance comes from them, worked out with you.
Worth knowing
Questions that make an appointment useful
When it's urgent
Severe, persistent tummy pain that may spread to your back, especially with nausea or being sick, can be a sign of acute pancreatitis and needs urgent help. Contact NHS 111 the same day, or call 999 or go to your nearest emergency department if the pain is severe, you cannot keep fluids down, or you feel very unwell. Do not wait it out, and do not assume it is an ordinary stomach upset. Being unwell can also push your glucose and ketones up, so if you can, check your ketones and let your diabetes team know you are ill.