Pralidoxime is not useful in poisoning with:
A i.e. Edrophonium Cholinesterase re-activators as pralidoxime (PAM) is ineffective as antidote to anti-cholinesterase poisoning with carbamates as - Physo / Pyrido /Neo - stigmine, Ambenonium & EdrophoniumQ.
Edrophonium
Malathion
Parathion
DFP