That's the first time I hear about this. A close friend of mine uses it and she just goes to the pharmacy. Never heard about any problems with supply.
This sounds pretty much like the supply is somewhat limited for whatever reason.
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[0] https://www.ameli.fr/pharmacien/actualites/antidiabetiques-a...
There were previously supply issues with these drugs throughout Europe, but those were mostly resolved by the end of 2024.
By mid-2025, it was (and still is) possible to easily get all of the medicines for any of the approved uses, including weight loss and diabetes.
https://www.fda.gov/drugs/drug-safety-and-availability/fda-c...
Currently, only Liraglutide is officially in shortage. Although others have been in shortage in the last couple years.