Merck Animal Safe Guard Beef Dairy Cattle Dewormer Paste 290gm Active Ingredient fenbendazole 10 100 mg/g Under Conditions of Continued Exposure to Parasites Retreatment May Be Needed After 4 6 Weeks For the removal and control of lungworms stomach worms and intestinal worms in beef and dairy cattle 5 G Safe Guard Paste Per 220lb Body Weight No Milk Withdrawal Period in Dairy Cattle