Compounding: medicine made to order.

What the word means

In compounding, a pharmacist, doctor, or registered medicine-making site prepares medicine to order rather than using a drug that comes ready-made.

Reviewing medicines is work the Food and Drug Administration (FDA) does for the U.S. government.

FDA’s September 2026 position is that compounding may help when an approved product is unavailable or cannot meet a particular need.

A medicine prepared to order does not have FDA approval.

Before patients receive it, the agency has not assessed how well it works, its quality, or its safety.

Different places can make the medicine

As of September 2026, a 503A pharmacy prepares medicine on prescription for an individually named patient and must meet the law’s other conditions.

A 503B outsourcing facility is a medicine-making site registered with FDA, often supplying clinics and hospitals. It can make batches of sterile medicines without a prescription naming each patient.

A sterile medicine contains no living germs.

Those names come from sections of federal law. Ask which kind of medicine maker would supply your medicine, and get its full name.

There are limits on copying ready-made medicines

As of September 2026, federal law limits making medicines to order that are essentially the same as available approved medicines.

Under the 503A copy rule, a change can qualify if the person prescribing the medicine decides it makes a meaningful difference to the named patient’s care. A cheaper price on its own does not qualify.

For example, preparing a medicine to order may allow a dye to be left out because the patient has an allergy to it.

Ask what makes the proposed change matter for your care. Keep that answer separate from the price discussion.