According to the PCCA (Professional Compounding Centers of America):
"Compounding is the Art and Science of Creating Personalized Medications
Pharmacy compounding is the art and science of preparing personalized medications for patients. Compounded medications are made based on a practitioners prescription in which individual ingredients are mixed together in the exact strength and dosage form required by the patient. This method allows the compounding pharmacist to work with the patient and the prescriber to customize a medication to meet the patient’s specific needs."