A reason for making it differently
Compounding starts with preparing a medicine for someone’s needs. The patient gets that preparation in place of a ready-made drug-company product. A pharmacist, doctor or medicine-making business registered with the FDA can prepare it.
A dye allergy is an example of why that change might matter. The FDA says compounding can help with needs that approved products cannot meet.
A compounded preparation reaches sale without FDA approval. The agency has not reviewed whether it is safe, works well or is made well before it goes on sale. This was checked September 26, 2026.
Permission has conditions
Federal law limits a pharmacy or doctor routinely making near-copies of drugs already sold on the market. The rule was checked September 26, 2026.
There is an exception for a change made for one named patient. The person writing the prescription must judge the difference between the two medicines important for that patient. Ask what need the change would meet. Paying less, by itself, is not the kind of difference this exception requires.
The Colorado law has the same boundary
Colorado’s law still requires compounded drugs to meet both state and federal rules. That law was checked September 26, 2026.
It does not grant permission for a compounded product that federal law forbids.
Follow the medicine back to its pharmacy