Diuretics can lower blood pressure and arrhythmia

One study found a link between diuretics and a reduction in sodium and potassium levels - two basic electrolytes. Low electrolytes can cause hypotension and arrhythmias.

Therefore, doctors in the UK are currently recommended to monitor high blood pressure patients who prescribe diuretics.

Professor Ian Hall, co-author of the report, said those taking thiazide - a diuretic - at high doses have a lower risk of lowering sodium levels.

Low sodium levels lead to hypotension, depression and falls in the elderly. Meanwhile, low potassium levels cause arrhythmias.

Only 32% of high pressure and cardiovascular patients are tested for sodium and potassium levels. Professor Ian Hall advises those who take this medicine every year to take a blood test once to control the electrolyte ratio.