dont think it would do the yb,s any harm , but there are better wormers nowadays
piperazine, used for ascarids [worms]
adverse reactions,,none
very common narrow spectrum wormer, and as bruno says,, the drug sedates the worm and the bird must pass the worm,before the drug is gone,or it will remain in the pigeon,,,personally i would go for ivermectin,[ a lot of people would disagree with me ] but i have found this to be highly effective and safe for all worms except tape worm