IV potassium chloride is recommended; usually 10 mEq / hour (10 mmol / hour) can be infused, but for severe hypokalemia (potassium level < 2.5 mEq / L (2.5 mmol / L)), 20 to 40 mEq / hour (20 to 40 mmol / hour) can be infused through a central venous line.