Zimectrin® is an paste dewormer that contains 1.87% ivermectin. Approved for broad-spectrum parasite control in horses, Zimectrin treats against a wide variety of harmful internal parasites, including bots and benzimidazole-resistant small strongyles. Each syringe treats up to 1,250 lbs body weight. 0.21 oz.
Panacur® PowerPac equine wormer by Merck Animal Health contains a double-dose of fenbendazole. It offers a complete five-day treatment against predominant internal parasites for a 1,250 lb horse. 5 syringes, 57 grams each.