Supportive care
Dextrose boluses/infusions
High dose pyridoxine for refractory seizures (5g IV initially) 
Avoid phenobarbital, especially in liver failure
Methylene blue for severe methemoglobinemia
Folinic acid (leucovorin) supplementation (hydrazines inhibit MTHF production)
Liver transplant for refractory hepatic failure
Gyromitra mushrooms
Amanita mushrooms
Crotinarius mushrooms
Jimson weed
Tapeworm
Pseudoparasites
Clitocybe
Ectoparasites