Which organization is primarily responsible for evaluating the safety and effectiveness of drugs used in veterinary practices?

The organization primarily responsible for evaluating the safety and effectiveness of drugs used in veterinary practices is the FDA. The Food and Drug Administration plays a crucial role in overseeing the approval process for animal drugs, ensuring they meet stringent safety and efficacy standards before being made available for use. This includes a comprehensive review of clinical trial data, manufacturing practices, and post-market surveillance to monitor ongoing safety concerns.

While other organizations like the CDC primarily focus on public health and disease control, the EPA is involved in regulating environmental safety, and the WHO deals with international public health matters, none of them have the specific mandate to evaluate veterinary drugs as the FDA does. Thus, the FDA's focused authority and expertise in the realm of drug safety and efficacy for both human and animal health solidify its primary role in this area.