“GTN spray can dilate your blood vessels quickly, which causes your blood pressure to suddenly drop and you may feel faint.”
High temperatures can also be dangerous if you have heart failure – meaning your heart doesn’t pump blood around your body as well as it should
The BHF adds: “If you’ve been told to restrict your fluid intake, speak to your GP about other ways to keep cool during summer.
“If you take water tablets and are dizzy or light headed let your doctor know.
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