Anaphylaxis
Anxiety
Methemoglobinemia -<unk> <unk> s oxidize Fe2+ to Fe3+ in Hb
Phenothiazines
Antihistamines
Sotalol
TCAs
Antipsychotics
Cocaine
Anti-spasmodics, cyclobenzaprine
Chloroquine
Anti-malarials
Class Ia and Ic antiarrhythmics<unk> 
Venlafaxine<unk>
Local anesthetic systemic toxicity
Anaphylaxis
Nitrogen narcosis
Anxiety
Calcium channel blocker toxicity
Methemoglobinemia - local anesthestics oxidize Fe2+ to Fe3+ in Hb
Cholinergic crisis
Phenothiazines