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it's not that it isn't safe, the problem is that ducks ingest MUCH more water and then get way too much of the meds. it can kill them. antibiotics not only kill bad 'germies' but good bacteria in the systems.
if you are treating your chickens, you shouldn't be introducing new birds to them. the new birds should be kept in isolation, quarantined away.
by the way, why are you treating the chickens?