Can you use medicated starter feed (with amprol) for older chickens?? Can you feed them triple wormer crumbles in with it? Does the medicated feed work if the chickens already have coccidiosis infection? The chickens affected are around 5-9 months old, two are laying, one is broody and the rest are not laying yet (I have one hen who does not lay at all). We are not really using the eggs for anything because they are frozen, so does it matter?? The rules on combatting coccidiosis are very confusing. Some are saying the medicated feed is not to be used after the chickens have been exposed? We have used Corid in their water but one of the chickens still has blood poops.