"The California Horse Racing Board is concerned by the apparently indiscriminate use of thyroxine
in horses racing and training at California tracks. Any thyroxine within CHRB enclosures must be
prescribed by a veterinarian licensed by the CHRB. Furthermore, the thyroxine must be prescribed
for a specific horse for a specific condition, and it must be properly labeled in compliance with
federal and state laws and CHRB regulations."
More detail in the advisory: http://www.chrb.ca.gov/veterinary_repor ... visory.pdf