SPIRABAC 6 | Best Spiramycin Injection for Dairy Cows Wholesale Price SPIRABAC 6 is the best medicine for treating mastitis (udder infection) and pneumonia in your cows. With 600,000 IU/ml of Spiramycin, it is very strong and works fast against Staphylococcus. For mastitis, just give 5ml per 100kg of body weight. It helps your cows get healthy and return to ...