Cydectin Pour-On is approved for use on beef cattle and dairy cattle (including lactating dairy cattle) for the treatment of infections and infestation of internal and external parasites. This easy to use pour-on contains a weather-proof formula with a purple dye to show which animals have been treated. Cydectin provides broad-spectrum control which has been shown to result in increased weight gain and reduced pasture contamination. Cydectin has been shown to provide persistency against specific key species, including brown stomach worm for 28 days, lungworm for 42 days, nodular worm for 28 days, barber pole worm for 14 days. There is zero milk withhold and zero slaughter withdrawal with Cydectin. Cydectin is dung beetle friendly.