Compounded Semaglutide vs Ozempic: What I Learned Is Actually Different

The short answer

Compounded semaglutide is meant to contain the same active molecule as Ozempic and Wegovy, but it is mixed by a pharmacy and is not FDA-approved. The FDA does not review compounded drugs for safety, effectiveness or quality before they are sold¹. Prices and supply terms vary. A lower price does not make a compounded product equivalent to an approved medicine.

Why I wanted this straight

Almost every low price I saw while comparing providers turned out to be compounded. For a while I held those numbers next to brand prices and called it a comparison. It isn't quite one, and I wanted to know which differences matter before treating a starting offer as a comparable price.

So I read what the FDA itself says, rather than what either side's marketing says.

Same molecule, different rules

The price is the reason this page exists. Brand self-pay prices now sit far below list price, and I laid them out dose by dose in Zepbound and Wegovy without insurance. I would compare the exact dose, formulation, supply and required services. A brand starter discount and a compounded prepaid equivalent do not establish which complete plan is cheaper.

What the FDA has actually said

Three things stood out to me on the FDA's own page¹.

Dosing mistakes. The agency has received reports of people getting the dose wrong with compounded semaglutide, some serious enough to need a hospital. Some were patients measuring and injecting the wrong amount themselves; some were clinicians miscalculating. Drawing a dose from a vial with a syringe is a different job from clicking a pen, which is why I would want the dose spelled out clearly.

Salt forms. Some compounded products have used semaglutide sodium or semaglutide acetate instead of the form in the approved drug. The FDA says it does not have information on whether these salts behave the same way.

Side-effect reports. The FDA has logged hundreds of adverse-event reports for compounded semaglutide and for compounded tirzepatide. Those reports don't prove the drug caused each problem, but they are why the agency keeps the page up.

The same page warns against buying from unlicensed online sellers at all, because counterfeit products can contain the wrong ingredient or the wrong amount.

What changed when the shortages ended

While the brand drugs were officially in shortage, the FDA gave compounders extra room to make them. It declared the tirzepatide shortage over in December 2024 and the semaglutide shortage over in February 2025².

That matters because of a rule about copies. The FDA says a state-licensed compounding pharmacy may not regularly make what are essentially copies of a drug you can buy commercially². A compounded product counts as a copy when it has the same ingredient, a similar strength and the same route as the approved drug, unless your prescriber documents a significant difference for you specifically.

In plain words, the two kinds of compounder are:

• 503A: a state-licensed pharmacy filling a prescription for one patient.
• 503B: an outsourcing facility, which works under its own limits on what bulk ingredients it may use².

You will often see compounded GLP-1s sold with an added ingredient or at a custom dose, and that rule is the background to it. I'm not a lawyer, and I can't tell you whether any one product meets the rule. I can tell you it's a fair thing to ask about.

What I ask a provider before I'd sign up

1. 1.Which pharmacy fills it, and is it a state-licensed 503A pharmacy or a 503B outsourcing facility?
2. 2.Is the active ingredient semaglutide itself, or a salt form?
3. 3.Will the label show a beyond-use date and the dose in both units and milligrams?
4. 4.Who do I call if I'm not sure how much to draw up?

I would ask for those answers in writing. I would not infer that a pharmacy is licensed, a dose is correct or a product meets compounding rules from reassuring marketing alone. I would want the prescriber to explain the individualized reason for the formulation and the pharmacist to demonstrate any measurement I am expected to perform.

When brand is the better deal

If you'd rather have the FDA-checked version, or a prefilled pen instead of a syringe, brand is more reachable than it was. The cheapest GLP-1 board is where I line up prices. And if what you really want is a smaller dose, I wrote about that in microdosing.

If you ever think you injected too much, or you can't stop vomiting, call your prescriber or Poison Control at 1-800-222-1222, or go to urgent care.