Section 1866.4 - Thyroxine Restricted(a) Thyroxine or any other thyroid hormone or thyroid hormone analog may only be administered to horses within a CHRB inclosure when both of the following conditions have been met: (1) A TRH- (thyrotropin-releasing hormone) response test has been performed by a CHRB licensed veterinarian and supports a diagnosis of hypothyroidism in the horse; and(2) A CHRB licensed veterinarian has submitted the TRH- (thyrotropin-releasing hormone) response test result to the official veterinarian or equine medical director and the official veterinarian or equine medical director approves the thyroxine prescription based on their independent determination that the test result confirms the hypothyroidism diagnosis.(b) The prescription for thyroxine or any other thyroid hormone or thyroid hormone analog administration shall not exceed 90 calendar days after which the prescription must be reauthorized by the official veterinarian or equine medical director under either of the following circumstances: (1) The official veterinarian or equine medical director has determined that the horse has benefitted from the previous thyroxine, thyroid hormone, or thyroid hormone analog treatment after reviewing the horse's medical records and consulting with the attending veterinarian, or(2) The hypothyroid diagnosis has been reconfirmed under the requirements described in subdivisions (a)(1) and (a)(2).(c) A horse administered thyroxine or any other thyroid hormone or thyroid hormone analog, pursuant to this regulation, is ineligible to start in a race for 30 calendar days after administration.(d) Possession of thyroxine or any other thyroid hormone or thyroid hormone analog within the racing inclosure is prohibited without a prescription obtained in compliance with this regulation.Cal. Code Regs. Tit. 4, § 1866.4
1. New section filed 9-23-2021; operative 1-1-2022 (Register 2021, No. 39). Note: Authority cited: Sections 19580, 19581 and 19582, Business and Professions Code. Reference: Sections 19580, 19581 and 19582, Business and Professions Code.
1. New section filed 9-23-2021; operative 1/1/2022 (Register 2021, No. 39).