North American Veterinary Licensing Examination (NAVLE) Practice Test

Dexamethasone is a corticosteroid that is used in food animals under certain conditions. It can be applied to address inflammatory conditions, allergic reactions, and as part of treatment protocols for certain diseases. When used in food animals, it is critical that the withdrawal times are observed to ensure that drug residues do not remain in the animal carcass at the time of slaughter, ensuring food safety for consumers.

On the other hand, the other options are not permitted for use in food animals due to concerns regarding drug residues and potential adverse effects on consumer health. Diethylstilbesterol, a synthetic estrogen, is banned in food animals due to its carcinogenic potential and harmful effects on human health. Estradiol cypionate, another synthetic hormonal compound, is also banned for use in food animals because of concerns regarding hormonal residues in food products. Furazolidone, an antibiotic, has been banned in many countries for use in food animals due to its potential for causing carcinogenic effects in humans.

This differentiation illustrates why dexamethasone is acceptable under regulated conditions, while the other substances are prohibited in food-producing animals.