It is/they are but they also feed those animals a ration of feed for a certain time before selling the to "clean them out", so to say. But on the other hand the % of the meds in the starter and grower ration is so minute you'd have to eat a ton of it to have any effects I'd imagine. It is put in the feed in a low dosage not to ward off coccidiosis it is in there to help the chicks build up an immunity (somewhat/or tollerate) the germs. It won't make your nose fall off or your toe-nails turn green( well not right away) LOL
This type feed is not feed to egg-layers as they are/should be well beyond the point of getting a severe case of the disease. One would think this surely, as they have made it 4 or 5 months on Gods green earth so far without issues.
To use medicated or non-medictaed ? that is the question. LOL It is the thing for some folks/not for others, just as most things are in life. No one is the same/ not even identical twins, just clones.
Jeff