The valbazen was recommended because it kills all types of worms, and is the safest of the off label wormers for first time use. There are links under my post about worming and de-licing. The meds that you can get at the stores are for big animals. There is dosing info in the links. Unfortunately there are no wormers at stores specifically for chickens except the kinds that only kill roundworms. Hope this helps! 
