There can be a medical reason
Compounding means preparing a medicine to order for a patient.
Compounding can address a patient need left unmet by an approved medicine, for example by leaving out an ingredient that causes that patient an allergy.
Ask the person writing the prescription what need the proposed change would meet for you.
Look inside the source drawer
The Food and Drug Administration (FDA) describes this work as a way to address particular patient needs.
The finished medicine is not approved
The Food and Drug Administration (FDA) reviews drug products.
As of September 2026, compounded drugs do not pass an FDA review for quality, effectiveness or safety before being supplied.
The pharmacy’s licence does not turn that preparation into an approved drug.
Ask what quality checks apply to the medicine being proposed.
Look inside the source drawer
FDA warns that poor preparation can leave germs or the wrong amount of medicine in a product.
A cheaper copy is still a copy
As of September 2026, federal law limits pharmacies and doctors that regularly make copies of approved medicines people can already obtain.
Making a bottle for one patient does not by itself answer whether the pharmacy is regularly making such copies.
A changed medicine may be allowed when the prescriber finds that the change makes a medically important difference for you as an individual.
Ask the prescriber to write down what was changed and why it matters for your care.
A price cut by itself is not that kind of medical difference.
Look inside the source drawer
The medical reason needs to concern the individual patient.
A national shortage once allowed copies
While a medicine is on the FDA’s national shortage list, pharmacies may have a way to make copies under the compounding rules.
Depending on the product, approved medicines containing semaglutide or tirzepatide treat diabetes or help with weight management.
The September 2026 FDA national shortage list has no entry for semaglutide injections or tirzepatide injections.
A pharmacy can no longer rely on that national shortage as its reason for making copies of these injections.
Being out of stock at a nearby pharmacy is not the same as being on that national list.
Adding a vitamin does not automatically stop a compounded version from counting as a copy.
Look inside the source drawer
When a national shortage ends, pharmacies lose the shortage-based reason for making copies; the other compounding rules still apply.