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Regulation of Prescription Paste Formulations for Horses

The regulation of prescription paste formulations such as phenylbutazone paste and ivermectin paste for horses by the FDA under the Federal Food, Drug, and Cosmetic Act.

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Jan 13, 2026
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What are the veterinary regulations governing prescription paste formulations like phenylbutazone and ivermectin?

Prescription paste formulations such as phenylbutazone paste for horses and ivermectin paste for horses are regulated as FDA-approved animal drugs with labeling, species-specific indications, and vete...

Jan 13, 2026

What are the clinical risks and documented adverse events from human ingestion of animal ivermectin or phenylbutazone products?

Animal formulations of ivermectin have been repeatedly linked to gastrointestinal symptoms, rapid-onset neurotoxicity (including confusion, loss of coordination, seizures, coma) and at least one repor...