Samples of the mushrooms resemble pictures of Amanita muscaria. You need an antoicholinergic. The cholinesterase isn't involved so no pralidoxime. One of the muscarine-poisoned youths is currently taking Nozinan, a phenothiazine antipsychotic, for bipolar disorder. Consider the possible interactions of Nozinan with muscarine.
Many drugs have anticholinergic effects- including phenothiazines.
Muscarine is a cholinergic.