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I gave them Ivermectin about a week and a half ago. I heard it’s best to switch up the types of de-wormer as the chickens can become resistant to the same kind. I also heard it’s best to give it to them twice a year regardless as a preventative?@BlueHorse17 You would be better off using Safeguard or Valbazen dosed orally to each chicken. I dont recommend using Ivermectin products for worming chickens. In my experience with Ivermectin over the years, large roundworms have become resistant to Ivermectin.