“Ivermectin is effective in controlling cecal worms along with some external parasites as well. There is a 14 day meat and egg withdrawal period for this product. For Ivermectin paste: .2 ml per pound of body weight. Dosed orally under the tongue for 3 to 5 days.”
Dosage quote from https://www.backyardchickens.com/articles/internal-parasites-parasitic-worms-in-chickens.66969/
Dosage quote from https://www.backyardchickens.com/articles/internal-parasites-parasitic-worms-in-chickens.66969/