What is the primary purpose of the Red Book?

The primary purpose of the Red Book is to provide drug pricing information. It serves as a comprehensive reference for healthcare professionals, including pharmacists and clinicians, to access current pricing and reimbursement information for various medications. This resource is particularly valuable in helping healthcare providers understand the cost of drugs, which can impact patient care decisions and pharmacy management.

While the other options contain relevant information associated with drug lists, vaccine information, or animal drug products, they do not align with the Red Book's main function, which is focused specifically on drug pricing rather than approval status, vaccination guidelines, or animal pharmaceutical products. This distinction makes the information within the Red Book vital for effective healthcare delivery and insurance processes.