FDA: ECP use in animals is illegal

Estradiol cypionate (ECP) isn't approved for animals, says the FDA in response to reports that pharmacies and veterinarians have compounded ECP for use as an estrogenic hormone for reproductive therapy in dairy cows and beef cattle. The FDA hasn't approved new animal drugs containing this product, because, the agency says, the safety of use hasn't been demonstrated, as required under the Federal Food, Drug, and Cosmetic Act.