21 CFR §1306.09

1. (a)No controlled substance that is a prescription drug may be delivered, distributed, or dispensed by means of the Internet without a valid prescription.
2. (b)In accordance with the Act, it is unlawful for any person to knowingly or intentionally fill a prescription for a controlled substance that was issued in a manner that constitutes dispensing by means of the Internet unless such person is a pharmacist who is acting in the usual course of his professional practice and is acting on behalf of a pharmacy whose registration has been modified under sections 1301.13 and 1301.19 of this chapter to authorize it to operate as an online pharmacy.
3. (c)Any online pharmacy that participates in the transfer between pharmacies of prescription information must do so in accordance with the requirements of §§ 1306.15 and 1306.25 of this part.