I haven't even heard of Darvon for about 40 years. It used to be the only pain-killer available by perscription back then short of opium or morphine. It was rough on the stomach and is definitely a narcotic. It was replaced by codied and then derivatives, which are used today.
I didn't know they even still made it.
It has no usage in horses. If a horse has injuries and/or pain, there are better things a vet can administer and you don't train or race. You work to fix the problem and get the horse back healthy.
I'm thinking he maybe thought that this drug is so old they don't test for it anymore. It's something you'd find in your grandmother's medicine cabinet.
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