As the UK faces its third heatwave of 2026, spreading intense temperatures across much of the country, health experts urge caution for those on certain medications. The Met Office has activated yellow and amber heat health alerts nationwide, signaling the need for increased awareness about how hot weather can impact drug effectiveness and safety.
Jason Murphy, Head of Pharmacy at Chemist4U, shares urgent guidance for individuals taking a wide range of common medications, including SSRIs, hormonal contraception, insulin, blood pressure treatments, ADHD stimulants, inhalers, and EpiPens.
“Rising temperatures mean it’s vital for people on regular medications to consider how the heat may affect them," Jason explains. “SSRIs – such as sertraline, citalopram, and fluoxetine – are among the most prescribed drugs in the UK. These medications can influence the hypothalamus, the brain region responsible for regulating body temperature. As a result, users might experience altered sweating patterns, dizziness, or become unaware of dehydration until symptoms worsen.”
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Hormonal contraception users should also exercise caution: “Pills, patches, and vaginal rings contain oestrogen and progestogen hormones sensitive to temperature,” Jason highlights. “They are typically stored below 25°C, and exposure to prolonged heat above 30°C can degrade the hormones, reducing contraception effectiveness. For example, a pill pack left in a hot car, handbag, or bathroom cabinet may no longer provide reliable protection. Signs like discoloration, stickiness, or softening indicate the medication may be compromised. In such cases, starting a new pack and using backup contraception methods—such as condoms—for at least seven days is strongly recommended.”
Jason emphasizes the importance of continuing prescribed treatments: “Do not stop taking any medication without consulting a healthcare professional. However, stay alert to any unusual effects caused by heat, and seek advice from your pharmacist or GP if you have concerns.”
With temperatures expected to remain high in the coming days, vigilance regarding medication storage and personal health is essential to avoid complications during this heatwave.