### Question
How does DEFINITIONS define antibiotic drug?


### Answer
Under *21 U.S.C. § 321*, **antibiotic drug** is defined as:

> any drug (except drugs for use in animals other than humans) composed wholly or partly of any kind of penicillin, streptomycin, chlortetracycline, chloramphenicol, bacitracin, or any other drug intended for human use containing any quantity of any chemical substance which is produced by a micro-organism and which has the capacity to inhibit or destroy micro-organisms in dilute solution (including a chemically synthesized equivalent of any such substance) or any derivative thereof

#### Citation:
  - *21 U.S.C. § 321*
  - Heading: **CHAPTER 9-FEDERAL FOOD, DRUG, AND COSMETIC ACT > SUBCHAPTER II-DEFINITIONS**

