I'm sure it works just fine, but from what I can see looking at the bottle on the website, it does NOT say what the active ingredient is, nor does it list the mg of that active ingredient, so how would one dose a small bird accurately? And by small, I mean 100-300 grams. And yes, I've had to dose birds that small, some smaller.
People protect their recipes. If they don't there are all kinds of knock-offs which could potentially cause trouble. The majority content I believe is Albendazole, but I'm sure there is some Praziquantel in it too. I've used it for years with no ill side affects. Dosing bird directions are on the product. Like I said, there is a wide safety margin on it. People have overdosed birds on it with no health problems put upon the bird. If you are dosing something like a Black-headed Caique, I suggest you buy from All Bird Products which markets wormers to the exotic bird owner. Wormazole is a poultry wormer.