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Hypokalemia
Potassium chloride, PO or IV
Hyperkalemia
The three steps
Calcium gluconate IV f EKG abnormality
Insulin and 50% dextrose to shift K+ intracellularly (or sodium bicarb if acidemia, or albuterol nebulized as a last resort)
Lokelma (sodium zirconium cyclosilicate) to eliminate K+ from body (or furosemide, or hemodialysis, based on situation)
Hypomagnesemia
Magnesium sulfate IV or PO
Hypermagnesemia
Calcium gluconate
Hypocalcemia
Symptomatic: calcium gluconate IV
Asymptomatic: oral calcium
Hypercalcemia
First-line: 0.9% saline, loop diuretics
And all the rest
Hypophosphatemia
Sodium phosphate
Potassium phosphate if patient also has hypokalemia
Hyperphosphatemia
If hypocalcemic, then IV calcium
If normo/hypercalcemic, then phosphate binders (calcium carbonate first-line)