Horse dewormer from Merial contains 1.87% ivermectin.
For the removal and control of large strongyles, small strongyles (including benzimidazole-resistant small strongyles), pinworms, ascarids, hairworms, stomach worms, bots, lungworms and threadworms. Safe for adult horses, including mares at any stage of pregnancy, plus foals as young as 6 weeks of age. Stallions may be treated without adversely affecting their fertility.
Each syringe treats up to 1,250 lbs body weight.