The regulation of the wholesale and pharmacy distribution of veterinary drugs in the United States primarily falls under the jurisdiction of the Center for Veterinary Medicine (CVM), which is a part of the Food and Drug Administration (FDA). The CVM is responsible for ensuring the safety and efficacy of veterinary drugs. However, individual states may have their own regulations managed by the Board of Pharmacy or similar entities, so there can be some variation at the state level.
In summary, the primary federal regulator is the Center for Veterinary Medicine.