Nix is intended for humans with head lice. Provent-a-mite (PAM) is intended for reptiles with reptile mites. PAM can probably kill a snake if you do not apply it to the ENCLOSURE correctly. PAM isn't intended to spray on the reptile. The affects of using Nix on reptiles or their enclosures is not known. To me, it is a variable not worth the risk.
When it comes to chemicals I don't fool around. I use them only for their intended purpose(s).