It's hard to find relevant articles addressing the effects of PAM (active ingredient permethrin) on snakes, since not many care about that...only about the effects
on people & "typical pets" or "wildlife" (birds aren't effected so much but it's highly toxic to fish), & of course, the insects it is used to kill.
http://npic.orst.edu/factsheets/PermGen.html
excerpt: How does permethrin work?
Permethrin can affect insects if they eat it or touch it. Permethrin affects the nervous system in insects, causing muscle spasms, paralysis and death. Permethrin is more toxic to insects than it is to people and dogs. This is because insects can't break it down as quickly as people and dogs. Cats are more sensitive to permethrin than dogs or people because it takes their bodies a long time to break it down.
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The above is why I think that PAM is the cause of the muscle spasms in your snake. Make sure he's well-hydrated, & right now I'd bathe him to make sure there isn't
any residue on his skin. Luke-warm water, gently soak with supervision & towel off. Let the vet know you're calling about an urgent issue (suspected poisoning) so
they don't make you wait to be seen. Ask if there's anything else you can do in the meantime?
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