We can't get flubenvet in the US, but I have Levasol I dewormed the flock with today, and I'd been using Fenben suspension on the caged birds. But it did not seem to be working very well, so I have switched to another dewormer for the birds in hospital. We also have Rooster Booster dewormer that I used a lot earlier in spring, but the problem with it is that some birds won't eat it, or don't eat enough of it. We have the same problem...our birds are on the same ground a lot of the time, depending on the weather.