Understanding treatment
When a pharmacy makes the medicine.
A medicine made or changed by a pharmacy needs its own explanation. Start by asking why the change is needed for your care.
To begin
What compounding means
A pharmacist or doctor can make or alter a medicine for a patient; that process is called compounding.
The US drug agency is the Food and Drug Administration, known here as FDA. FDA says compounding may help a patient whose needs are not met by an approved medicine, or when an approved product is unavailable, as of September 2026.
These medicines, as of September 2026, have no FDA approval. Before sale, the agency has not assessed whether they are safe, have the right quality, or work as intended.
Look a little closer
Cheaper does not settle the rules
Federal rules, as of September 2026, limit how often a pharmacy or doctor may prepare a medicine that closely copies an available product.
As of September 2026, the pharmacy rule allows a change for a particular patient. The prescriber must find that the altered medicine makes an important difference to that particular patient’s medical care.
For example, a medicine may be changed for someone allergic to a dye in the finished product, or unable to swallow a tablet.
A cheaper price alone does not count as that medical difference as of September 2026.
Medicines for blood sugar or weight use ingredients such as semaglutide and tirzepatide.
As of September 2026, neither semaglutide nor tirzepatide is on FDA’s national list of medicines in short supply.
An empty shelf at one pharmacy does not mean the medicine is listed nationally as being in short supply.
Look a little closer
Get the reason and the maker’s name
What need would this medicine meet that an approved product would not?
What change to my medicine has the person prescribing it written down for me?
Which pharmacy would make it?
Who would explain the label, storage, and questions about use?
Chapter recap
Keep this in mind.
Keep the medical reason beside the price. A price comparison cannot replace the explanation for compounding.