### Question
What does official compendium mean?


### Answer
**Official compendium** has the following meaning in *21 U.S.C. § 321*:

> the official United States Pharmacopoeia, official Homeopathic Pharmacopoeia of the United States, official National Formulary, or any supplement to any of them

#### Citation:
  - *21 U.S.C. § 321*
  - Heading: **CHAPTER 8-NARCOTIC FARMS > SUBCHAPTER II-DEFINITIONS**

