Central nervous system
Weakness
Cramps
Hyporeflexia
Gastrointestinal
Ileus
Renal
Metabolic alkalosis
Cardiovascular
PACs/PVCs
Bradycardia or atrial/junctional tachycardia
AV block
Ventricular tachycardia, Ventricular fibrillation
Weakness
Cramps
Hyporeflexia
Ileus
Metabolic alkalosis
PACs/PVCs
Bradycardia or atrial/junctional tachycardia
AV block
Ventricular tachycardia, Ventricular fibrillation
Hypokalemia
Alkalosis 
Hyponatremia
Insulin
Hypernatremia
Beta agonists
Hyperkalemia
Hypokalemic periodic paralysis