Io Equiduo Liquid For Horses 100Ml iO Equiduo (Ivermectin and Praziquantel) has been formulated for administration by oral drench or stomach tube (nasogastric intubation). One low-volume dose is effective against important internal parasites, including tape worms and the arterial stages of strongylus vulgaris, and bots. 100mls treats 10 X 500 kgs horses. 250mls treats 25 X 500 kg horses.