All the threads I've found go the other way! When I bought my chicks from a feed store in another city, they said they were being fed non-medicated starter, so I bought non-medicated Purina crumbles to keep them on the same thing. After having them awhile, I've decided that I would prefer to have them on medicated. All my local feed store had was non-Purina medicated mash, so I bought some of that but haven't fed it yet. Am I setting myself up for disaster? My chickies are 16 days old today.