Unfortunately there have been a number of posts from people on this class of drugs, as it does appear to be a worldwide issue.
Tagging
@Rachox who was on victoza, which is in the same class of meds.
But here is a link on the issue from the UK diabetes charity
Update, 20 October, 2025: On 15 October 2025, the Department of Health and Social Care (DHSC) issued a Medicines Supply Notification (MSN) to say that the GLP-1 agonist exenatide, which has the brand name Bydureon, has been discontinued and supplies are no longer available.