Negasunt poisonous to dogs

by Claire
(Trinidad and Tobago)

Is Negasunt poisonous to dogs I have used it to remove maggots on a leg wound on a a six year old Rottweiler.

He has licked it off . He now seems to have a kidney problem Sudden and acute.

The vet said I should put him to sleep as kidney problems are irreparable but he was fine just a week ago and I did not do this he is being treated with a drip to rehydrate and an antibiotic.

Can it be poisoning from me packing his wound with Nagasunt?
Is there an antidote?