« Home / Title 21 - Food and Drugs--Volume 6 / CHAPTER I - FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) / SUBCHAPTER E - ANIMAL DRUGS, FEEDS, AND RELATED PRODUCTS / PART 520 - ORAL DOSAGE FORM NEW ANIMAL DRUGS / § 520.1720 Phenylbutazone oral dosage forms.