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Millions of US adults use GLP-1s outside approved guidance
A CDC survey estimates that around 27 million US adults used GLP-1 medicines in 2025, while many users changed how they took them or used compounded versions that are not FDA-approved. The findings raise public health questions about safety and effectiveness, particularly as cost and access pressures appear to be driving some of these choices.
Among GLP-1 users, 44 per cent reported taking the medicine differently from their prescription; more than half of those cited cost or availability. At least 23 per cent used compounded versions, and 62 per cent of that group were not taking them as prescribed, compared with 36 per cent of brand-name users. The CDC researchers say more evidence is needed on the safety of these practices and the quality of compounded medicines.
In short
- Around 27 million US adults used GLP-1 medicines in 2025.
- 44 per cent of users changed how they took them.
- Cost pressures and compounded versions raise safety questions.
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The case for
When prescribed and monitored appropriately, GLP-1 medicines can offer meaningful health benefits, and cost or supply shortages may leave people struggling to follow their treatment as directed. Compounded versions or adjusted use may seem like practical ways to maintain access, though their safety and effectiveness need better evidence.
The case against
Using GLP-1 medicines differently from a prescription, or taking compounded products with uncertain quality, can make dosing less predictable and expose people to avoidable risks. The high share of users reporting these practices raises legitimate concerns about safety and effectiveness, supporting calls for careful medical oversight and reliable access to approved medicines.
Explained simply
GLP-1 medicines are prescription drugs that affect hormones involved in blood sugar and appetite. They are used to treat conditions such as type 2 diabetes and, for some medicines, to support weight loss.
The US Food and Drug Administration (FDA) approves specific medicines and sets guidance for how they should be used. Compounded versions are specially prepared by pharmacies and are not FDA-approved in the same way as branded products, so their quality and effects may be less certain.
Cost and shortages can affect whether people can obtain their prescribed medicine. How a medicine is taken, and whether its ingredients and strength are consistent, can matter for its safety and effectiveness.
Read the full article at the source →
Originally published by Ars Technica as “Millions in US use unapproved GLP-1s—and use them in unapproved ways”.