The US Food and Drug Administration (FDA) has sent warning letters to three companies over their marketing of products for stomach ulcers in horses.
The FDA sent the letters to Tri-Star Equine Marketing, Horse PreRace and Horse Gold, Inc, all of which are Florida-based.
The three firms are accused by the FDA of marketing the gastric ulcer products as being intended for use in the mitigation, treatment, or prevention of disease in animals, which it says makes them a drug under federal law.
The products required federal approval, the FDA said.
Each company was told that it was their responsibility to ensure that all their products complied with the relevant laws and regulations.
The FDA warned that failure to promptly correct the alleged violations may result in enforcement action without further notice.
The companies have 15 working days to tell the FDA of the steps they have taken to comply with the law.
Copies of the letters can be found here.