### Question
How does the law define valid prescription?


### Answer
Under *21 CFR § 1300.02*, **valid prescription** is defined as:

> a prescription that is issued for a legitimate medical purpose by an individual practitioner licensed by law to administer and prescribe the drugs concerned and acting in the usual course of the practitioner's professional practice.

#### Citation:
  - *21 CFR § 1300.02*
  - Heading: **Title 21-Food and Drugs > PART 1300—DEFINITIONS**

