I've used Apiguard and the bees didn't like it and it caused shot brood and queens quit laying and I swore I'd never use it again. I know some people use it but I stopped all useage of it and of ApiLife Var also, which is the same thing in a wafer instead of in a goop.
I now use screen bottom boards with powdered sugar dusting using a flour sifter over the top bars and brushing it down between frames, takes short time to do it and the bees have done much better this year.
This is what I do because of my dissatisfation from using any of the mainline beek industry recommended treatments, and I've had good results.
You may have different results yourself, I just outlined what I do incase you might be interested yourself.
I'm sure there are many out there that dissagree with my way of treating, I've been lashed out at for recommending it in the past but it's my choice and I'm not saying anyone has to do it. I'm just mentioning it so it's known there are options other than strong treatments that are recommended in the media.
“When one tugs at a single thing in nature, he finds it attached to the rest of the world.” – John Muir