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Drug interactions

MagazineMarch 2004 (Vol. 14 Issue 12)Drug interactions

Q I regularly take aspirin but, recently, I've been prescribed an antihypertensive

Q I regularly take aspirin but, recently, I've been prescribed an antihypertensive. Is there any interaction between these drugs? - CH, Swindon

A The effect of one drug on another is almost never tested when it's first licensed, so any reactions are noticed only when patients complain of side-effects.

Antihypertensives tend to be 'lifestyle' drugs, and are often prescribed for long periods of time. As a result, they are often taken with other drugs, and there's a long list of drugs with which they can adversely react - aspirin is among them.

Drug interaction is more common, and more serious, in the elderly. Such patients are more likely to be taking a huge cocktail of various drugs - called 'polypharmacy' - and their kidneys are less able to cope with the toxic load.

Antihypertensives can interact with beta-blockers, diuretics, ACE inhibitors, NSAIDs (non-steroidal anti-inflammatory drugs) such as aspirin, and other antihypertensives. High-dose (but not low-dose) aspirin can negate the effects of your antihypertensive (J Hypertens, 2002; 20: 1015-22).

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