The maximum authorized threshold for Phenylbutazone, otherwise known as bute, is 2.0 micrograms per milliliter of plasma or serum when administered in accordance with Controlled Therapeutic Medication Schedule Version 4.2.1 dated December, 2020 and § 20:04:27:14.

Reference: Association of Racing Commissioners International (ARCI), ARCI Controlled Therapeutic Medication Schedule for Horses Version 4.2.1 dated December, 2020. A copy may be obtained from the ARCI website at www.arci.com free of charge.

Source: 50 SDR 15, effective August 13, 2023; 51 SDR 16, effective August 18, 2024 .

General Authority: SDCL 42-7-56 (4).

Law Implemented: SDCL 42-7-47 .

Prior versions effective: 2023-08-13.