DURVET SUSTAIN III CATTLE BOLUS SULFAMETHAZINEFor oral administration to beef cattle and non lactating dairy cattle. For use on beef cattle, and non lactating dairy cattle. For oral administration to beef cattle and non lactating dairy cattle. Sustained action 3 full days from a single treatment. Fast acting reaches minimum therapeutic blood levels within 6 hours post administration. Highly concentrated provides peak antibiotic blood levels of 250ppm quickly acts to break fever. Sustain III