California Code, Business and Professions Code - BPC § 2620.3

A physical therapist licensed pursuant to this chapter may apply topical medications as part of the practice of physical therapy as defined in Section 2620 if he or she complies with regulations duly adopted by the board pursuant to this section and the Administrative Procedure Act.  The board shall adopt regulations implementing this section after meeting and conferring with the Medical Board of California and the California State Board of Pharmacy specifying those topical medications applicable to the practice of physical therapy and protocols for their use.  Nothing in this section shall be construed to authorize a physical therapist to prescribe medications.