Cydectin^® Oral Drench is approved for the treatment and control of infections due to internal parasites of sheep. Cydectin is an easy, ready-to-use dewormer that's effective in the treatment and control of adult and larval (L4) stages of brown stomach worm (Teladorsagia circumcincta), barber pole worm (Haemonchus contortus), hairworm (Trichostrongylus axei) and other parasites listed on the label. Find more information here.