Atropine, Pralidoxime, and Diazepam within 12 hours of a lethal dose should help a lot. This is assuming that the exposure is less than the ceiling limit or the IDHL limits cause at that point it doesn't matter anymore.

You need Atropin 5 mg every 10 minutes the sooner the better. Further you need Obidoxim-chloride but this is tricky because the longer it takes for you to get it the higher the chance that symptoms are permanent or that you die. If you start to have breathing problems it's to late but it rly depends on yourself and the dosage when it will be to late. can be after an hour can be after 20.