AiM-A Abamectin VetCaps are gelatin capsules containing 10 mL of abamectin (a macrocyclic lactone in the avermectin family), and is an EPA-approved systemic insecticide for effective control of horn flies on beef cattle and non-lactating dairy cattle. The capsules are designed to be used exclusively with the VetGun and can be used in rotation with AiM-L VetCaps (lambda-cyhalothrin) as an effective in-season treatment and control of horn flies.