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Here you go, post #20 in this link: https://www.backyardchickens.com/threads/roundworms-help.1560487/page-2#post-27149719

Ivermectin has been losing its effectiveness in treating poultry roundworms due to its overuse treating mites in poultry. Some parts of the country are seeing mite resistance to Ivermectin as well. You'd be better off using Valbazen or Safeguard since both treat all types of poultry roundworms.