Zoetis Quest Plus Gel Horse WormerQuest Plus Gel Horse Wormer combines 2% moxidectin and 12.5% praziquantel for the treatment and control of large and small strongyles, encysted cyathostomes, ascarids, pinworms, hairworms, large mouth stomach worms, stomach bots and tapeworms. One dose also suppresses strongyle egg production through 84 days. Quest Plus Gel may be used in horses and ponies 6 months of age and older. Approved in breeding mares and stallions. Each Quest Plus Gel sure-dial syringe is calibrated in 50 lb. increments, and treats up to 1500 lbs. body weight.