) Dual action penicillin contains 150,000 units penicillin G benzathine and 150,000 units penicillin G procaine per ml. Maintains active penicillin blood levels for a full 48 hours. Use in cattle for treatment of bacterial pneumonia (shipping fever) and upper respiratory infections. Administer 2 ml per 150 lb. body weight to beef cattle SQ only. Repeat in 48 hours. Treatment with dual action penicillin should be limited to a total of 2 doses given SQ. Not for use in lactating dairy cattle.