If you’re shopping for a GLP-1 online, you’ll see two very different kinds of products: FDA-approved brand-name medications and compounded medications made by pharmacies. They can contain the same named active ingredient, but legally and practically they are not the same thing.
The core difference: FDA approval
| Brand-name (e.g., Wegovy®, Zepbound®) | Compounded semaglutide / tirzepatide | |
|---|---|---|
| FDA-approved? | Yes | No |
| FDA reviewed safety, effectiveness, quality before sale? | Yes | No |
| Made under | FDA-inspected manufacturing (CGMP) | A state-licensed 503A pharmacy, or an FDA-registered 503B outsourcing facility |
| Clinical trial evidence | Large randomized trials of the approved product | None for the specific compounded product |
| Typical cost | Higher; insurance or manufacturer self-pay programs may help | Lower cash price; usually not covered by insurance |
In its March 2026 announcement, FDA put it plainly: compounded drugs “are not FDA-approved,” the agency “does not review their safety, effectiveness or quality before they are marketed,” and, unlike generic drugs, they have not been approved by FDA.
What the evidence covers
The headline weight-loss results you’ve probably seen come from trials of the approved products. In the STEP 1 trial, adults taking semaglutide 2.4 mg (the Wegovy dose) lost an average of about 15% of body weight over 68 weeks, compared with about 2% on placebo. In SURMOUNT-1, tirzepatide at the highest dose produced an average loss of about 21% over 72 weeks. Those numbers don’t transfer to any compounded product, which hasn’t been studied that way. Individual results vary, and no outcome is guaranteed.
When is a compounded GLP-1 appropriate?
According to FDA, “Compounded drugs should only be used in patients whose medical needs cannot be met by an FDA-approved drug.” Since the shortages ended in 2025, a 503A pharmacy may compound a version of an approved drug only for an individual patient, and not regularly or in large amounts as an “essentially a copy,” unless a prescriber documents a significant clinical difference for that patient. That’s a medical judgment for a licensed clinician, not a marketing decision.
Known risks FDA has flagged
- Dosing errors. Compounded GLP-1s often come in multi-dose vials that you draw up yourself.
- Storage problems. FDA has received complaints about products arriving warm.
- Ingredient quality. FDA uses an import alert to keep certain GLP-1 ingredients with potential quality problems out of the U.S. supply.
- Misleading marketing. FDA has warned dozens of telehealth companies over claims implying their products match approved drugs.
How to decide
- Start with a licensed clinician and ask whether an FDA-approved option works for you, including insurance or self-pay programs.
- If you and your clinician choose a compounded product, pick a provider that names its pharmacy, has no FDA warning letters, and is clear that the product is not FDA-approved. See our safety checklist.
- Compare real, dated prices on our price tracker.
Frequently asked questions
How do compounded GLP-1s differ from generic drugs?
FDA says generic drugs are FDA-approved and compounded drugs are not. A compounded drug is prepared by a pharmacy and hasn't been through FDA's approval process.
Do the clinical trial results for Wegovy and Zepbound apply to compounded versions?
No. Published trial results describe the FDA-approved products studied in those trials. They don't establish the safety or effectiveness of any compounded product.
Sources
- FDA press release, Mar 3, 2026: compounded drugs are not FDA-approved and differ from generics
- FDA: Concerns with unapproved GLP-1 drugs used for weight loss
- FDA: Compounding laws and policies
- Wilding et al., STEP 1 trial (Wegovy), NEJM 2021
- Jastreboff et al., SURMOUNT-1 trial (Zepbound), NEJM 2022
We cite primary sources (FDA, peer-reviewed journals, provider sites) wherever we can, and we date every price. Found an error? Tell us and we'll fix it.
This article is for information only and isn't medical advice. Talk with a licensed clinician before starting, stopping, or changing any medication. Individual results vary, and no outcome is guaranteed.