| Drugs | Electrolyte disturbances |
| • Antiarrhythmic drugs: class Ia (disopyramide, procainamide, quinidine); class III (amiodarone, bretylium, sotalol) | • Hypokalaemia |
| • Antibacterials: | • Hypomagnesaemia |
| erythromycin, fluoquinolones, | Congenital syndromes |
| trimethoprim | • Jervell and Lange-Nielsen syndrome |
| • Other drugs: terfenadine, cisapride, tricyclic antidepressants, haloperidol, lithium, phenothiazines, chloroquine, thioridazine | • Romano-Ward syndrome |
| Other causes | |
| • Ischaemic heart disease | |
| • Myxoedema | |
| • Bradycardia due to sick sinus syndrome or complete heart block | |
| • Subarachnoid haemorrhage | |
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