That is a weak and expensive version of fenbendazole diluted with water for 5 days with no egg withdrawal time. It only treats roundworms, one type of possible chicken worms. Dosage is a bit hard to figure. You could get a fecal float by your vet on some combined droppings, to see if your chickens have worms. If I wanted to worm, I would use something that gets roundworms, cecal, gape, and capillary worms. Albendazole or Valbazen 0.5 ml given orally once and again in 10 days or 10% fenbendazole SafeGuard Liquid Goat Wormer 0.23 ml per pound of weight for 5 consecutive days given orally are safe to use. Shake either product well before drawing up a dose. Egg withdrawal time is 2 weeks from the last dose. SafeGuard is the same drug as the expensive small amount of product in the picture above, but much weaker. It is a cattle wormer, recently marketed for chickens in a tiny amount. I find the dosage very confusing.
