My girls have had tape worm. I wormed twice (10 days apart) with Praziquantel right before Christmas. That was the first time I have ever treated for worms simply because I was unaware of the need for regular worming. I have only had chickens for a little over a year and am learning as I go. I have bought some Valbazen to do a thorough worming now. I know the dosage and everything, etc. I have just read a LOT of mixed info about using this as a first time wormer, because the worms may overload their system coming out. I want to make absolute sure this is going to be safe. Also, I am not 100% sure if the tapeworms were totally eradicated and was curious as to how or if Valbazen will help with that. I would love any personal experience info with this! Thanks!