I'm surprised you found Wazine, it's been discontinued and most people can't find it anywhere anymore. Where are you, generally, in the world, makes it easier to recommend things? Do you have a vet that will do a fecal float test for you? Some will do even if they don't see chickens, some won't. That would let you know for sure whether it's worms that are an issue or not, and which one. If you can't get that done (there are mail in options for that too, amazon carries one) then I would recommend that you get some Safeguard Liquid goat wormer and use that instead, or order some Valbazen online. The issue with Wazine is that it's mixed in the water so dosing is dependant on them drinking enough of it. The others are direct dosed orally, so you know they got the correct amount. Since he improved once after worming, then it seems reasonable to treat again and see if he improves. And depending on what parasite you are dealing with, reinfection is common, particularly with roundworm. It's really easily picked up in the environment and the eggs survive in the soil for a really long time. You may have to follow a regular worming schedule to keep them healthy. That's why it's a good idea to know which one you are dealing with whenever possible. Worms most often are not seen in the droppings, the test looks for the eggs, which are microscopic. Sometimes roundworm or tape segments will be expelled if a bird is carrying a heavy load, but most often you won't see them. Since you just treated again, then I would try to have a test done in 4-6 weeks to see if anything is found, or be ready to test if you see symptoms again, as the wazine may prevent anything from showing up right now.
https://www.amazon.com/dp/B000J5SOZ...colid=27RHKHAM35GO&psc=1&ref_=lv_ov_lig_dp_it