Q-drench For Sheep 1 LitreQ Drench is a short acting 4 way combination sheep drench which contains 4 actives with 4 different modes of action at 4 fully effective doses. Q Drench is ideal drench for treatments such as weaning, pre lambing, quarantine, primer and exit drenches which achieve their aims. Using Q Drench as part of or within the season drench rotation will increase sheep productivity and help delay the development of parasites.