| Bradycardia/AV blockade | | Beta blockers | | Calcium channel blockers | | Cardiac glycosides | | Digoxin | | Digitoxin | | Red squill | | Digitalis lanata | | Digitalis purpurea | | Bufotenin | | Oleander | | Alpha-adrenergic agonists | | Phenylpropanolamine | | Clonidine | | Imidazolines | | Cholinergics | | Organophosphates | | Carbamates | | Opioids | | Sedative-hypnotics | | Magnesium | | | Supraventricular tachycardia | | Sympathomimetics | | Amphetamines | | Cocaine | | Theophylline | | Caffeine | | Methylphenidate | | Ephedrine | | Pseudoephedrine | | Albuterol | | Dobutamine | | Epinephrine | | Dopamine | | Anticholinergics | | Antihistamines | | TCAs | | Phenothiazines | | Clozapine | | Atropine | | Scopolamine | | Thyroid hormone | | Cellular asphyxiants | | Carbon monoxide | | Drug withdrawal states | | | Ventricular tachycardia | | Sympathomimetics | | Cocaine | | Amphetamines | | Theophylline | | Antidepressants | | TCAs | | Antipsychotics | | Phenothiazines | | Chlorinated hydrocarbons | | Chloral hydrate | | Solvents | | Fluoride | | Cardiac glycosides | | Potassium | | | QRS and QT interval prolongation | | Antidepressants | | Citalopram | | Escitalopram | | Bupropion | | Venlafaxine | | Desvenlafaxine | | Tricyclic antidepressants | | Antipsychotics | | Antihistamines | | Diphenhydramine | | Astemizole | | Terfenadine | | Antiarrhythmics | | Quinidine | | Disopyramide | | Procainamide | | Propafenone | | Flecainide, encainide | | Amiodarone | | Calcium channel blockers (rare) | | Beta blockers (rare) | | Ondansetron | | Propoxyphene | | Organophosphate insecticides | | Antimicrobials | | Amantadine | | Azithromycin | | Chloroquine | | Erythromycin | | Pentamidine | | Quinine | | Quinolones (eg, ciprofloxacin) | | Arsenic | | Thallium | | Fluoride | | Citrate | | Lithium | |
