This is true. However, it is critical not to overdose with this method. You need to dissolve 25mg/kg of bodyweight. As you can see it is difficult to dose with frogs that only weigh 2 or 3 grams. I have only used this method in extreme cases when I felt I was losing the battle. Kurt uses liquid Fenbendazole and might be able to share how to dose it without having to dissolve the powder preperation. I prefer the dusting method, you don't have to be precise.