Compounding is the science, expertise and art of combining two or more separate ingredients together to produce a uniquely customized medication. 

"Rx" is the symbol for a medical prescription.

A medical prescription is an order (usually in written form) by a qualified health care professional to a pharmacist for a medicine to be provided to their patient. A prescription is a legal document, which not only instructs in the preparation and provision of the medicine or device, but indicates the prescriber takes responsibility for the clinical care of the patient and the outcomes that may or may not be achieved.

Regular pharmacies only offer medications already mass-produced on the market. Compounding pharmacies like Roadrunner Pharmacy specialize in making custom-tailored drugs, in addition to offering the same non-compounded and over-the-counter drugs that patients can obtain from regular pharmacies.

Pet owners should direct their pricing questions to clinics that use Roadrunner Pharmacy.