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Table 2 Toxin Induced ECG Effects

From: Management of the critically poisoned patient

Toxins that prolong the QT interval Toxins that prolong the QRS interval
Antihistamines Amantadine
   Astemizole Carbamazepine
   Clarithromycin Chloroquine
   Diphenhydramine Class IA antiarrhythmics
   Loratidine Disopyramide
   Terfenadine Quinidine
Antipsychotics Procainamide
   Chlorpromazine Class IC antiarrhythmics
   Droperidol Encainide
   Haloperidol Flecainide
   Mesoridazine Propafenone
   Pimozide Citalopram
   Quetiapine Cocaine
   Risperidone Cyclic Antidepressants
   Thioridazine Amitriptyline
   Ziprasidone Amoxapine
Arsenic trioxide Desipramine
Bepridil Doxepin
Chloroquine Imipramine
Cisapride Nortriptyline
Citalopram Maprotiline
Clarithromycin Diltiazem
Class IA antiarrhythmics Diphenhydramine
   Disopyramide Hydroxychloroquine
   Quinidine Loxapine
   Procainamide Orphenadrine
Class IC antiarrhythmics Phenothiazines
   Encainide Medoridazine
   Flecainide Thioridazine
   Moricizine Propranolol
   Propafenone Propoxyphene
Class III antiarrhythmics Quinine
   Amiodarone Verapamil
   Dofetilide  
   Ibutilide  
   Sotalol  
Cyclic Antidepressants  
Erythomycin  
Fluoroquinolones  
Halofantrine  
Hydroxychloroquine  
Levomethadyl  
Methadone  
Pentamidine  
Quinine  
Tacrolimus  
Venlafaxine