Bisphosphonates are drugs used to treat degenerative bone diseases in humans. In horses, they’re used to treat a similar array of problems, like navicular syndrome, a painful disease whereby the navicular bone in the heel of the horse loses its bone density. But the potential consequences from misuse in racehorses — especially in young racehorses — is causing mounting concern among a growing number of respected veterinarians and regulators in the industry. 

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