The antidote for Strychnine poisoning is -
Treatment for strychnine poisoning includes:

The first step is to control convulsions by keeping patient in dark room, diazepam
The antidote for strychnine is short-acting barbiturates like Phenobarbital
Gastric lavage with water, potassium permanganate, charcoal
Acidification of urine
Barbiturates
Physostigmine
Fomepizole .
Naloxone