One in five patients taking diuretics commonly prescribed for high blood pressure or heart conditions end up with reduced sodium and potassium levels, according to a study published in the January issue of the British Journal of Clinical Pharmacology.
Yet recent evidence suggests that perhaps as few as a third of patients on the drugs – used by one in eight adults – have their electrolyte levels tested, despite the fact that reduced levels can lead to a wide range of health problems.
A team from Queen’s Medical Centre and the University of Nottingham reviewed the records of more than 32,000 adults from six UK general practices in the East Midlands.
“Patients taking higher doses of thiazide diuretics are at particular risk of low potassium levels and elderly patients are at a particular risk of low sodium levels” concludes co-author Professor Ian Hall.
“This points to the need for prescribing low doses of thiazide diuretics and monitoring sodium and potassium levels to reduce the risk and increase the detection and treatment of these electrolyte abnormalities.
“Despite the fact that more than a fifth of the patients we looked at suffered from reduced electrolyte levels, less than a third of the people given this commonly used type of drug appear to have had tests to check their levels.”
The authors stress that people should never stop taking prescribed medicine without first seeking advice from their GP.
“In our view, if people are on thiazide diuretics, it would be sensible for them to ask their doctor about routine testing for sodium and potassium levels next time they have an appointment or go to the surgery for a medication review” adds Professor Hall.
“This is particularly important if people have been feeling unwell, are elderly, taking other heart medication or are on higher doses of the drug.”
Annette Whibley | alfa
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