Can diuretics cause rapid heart rate?

Diuretics: Hypovolemia produces tachycardia through compensatory mechanisms that occur through the carotid baroreceptors and renal perfusion feedback mechanisms to stimulate the sympathetic nervous system.

Electrolytes: In addition to causing hypovolemia, many diuretics can also deplete important electrolytes that keep your heart rate steady. Very low levels of potassium and magnesium, especially, can be dangerous. Talk to the diuretic prescriber about checking and replacing your electrolyte levels, while using diuretics.