(a) No prescription is required in case of the sale of controlled substances at retail in pharmacies by pharmacists to any of the following:
(1) Physicians.
(2) Dentists.
(3) Podiatrists.
(4) Veterinarians.
(5) Pharmacists acting within the scope of a project authorized under Article 1 (commencing with Section 128125) of Chapter 3 of Part 3 of Division 107, or registered nurses acting within the scope of a project authorized under Article 1 (commencing with Section 128125) of Chapter 3 of Part 3 of Division 107, or physician assistants acting within the scope of a project authorized under Article 1 (commencing with Section 128125) of Chapter 3 of Part 3 of Division 107.
(6) Optometrist.
(b) In any sale mentioned in this article, there shall be executed any written order that may otherwise be required by federal law relating to the production, importation, exportation, manufacture, compounding, distributing, dispensing, or control of controlled substances.