7 Pa. Code § 401.4
(a) A foreign substance of accepted therapeutic value may be administered as prescribed by a veterinarian when test levels and guidelines for its use have been established, adopted and published by the Commission, the RMTC Schedule of Therapeutic Medications, the ARCI, the USTA, or a similar Nationally recognized organization.
This section cited in 7 Pa. Code § 401.3 (relating to restrictions; prima facie evidence).