My husband bought non medicated by mistake and I don't want to waste it. I had him get medicated today for I really like to start my chicks out on medicated. I was thinking of changing to the non medicated at about 2 weeks or so. My chicks have a grow out pen outside that they go out to at about 4 to 6 weeks.They do stay on chick starter till about 12 to 15 weeks. out here it is starter then grower/layer. I would like to have my 50# bag of medicated last me as long as I can since feed is starting to go up.