A pharmacy expert has issued a warning to millions of people that the UK's current heatwave could dangerously affect common medications. Rhysa Phommachanh, a health specialist at Landys Chemist, said critical drugs including insulin and EpiPens are among those at risk.
How Heat Affects Key Medications
Phommachanh explained: "Insulin can become less effective if it is exposed to high temperatures, as heat can cause it to degrade and reduce its ability to properly control blood sugar levels." She added that EpiPens can become unstable if stored above 25°C, potentially reducing their reliability during life-threatening allergic reactions. Asthma inhalers may also be affected by pressure changes caused by high temperatures.
Other Medications at Risk
People taking diuretics should be particularly careful about fluid loss, which can contribute to dehydration. Antihistamines "can have a drying effect on the body and may reduce sweating, which limits the body's ability to cool itself effectively in high temperatures," Phommachanh warned. Antidepressants such as sertraline and fluoxetine can interfere with the brain's regulation of body temperature. Certain antibiotics may cause photosensitivity, increasing sunburn risk.
Storage Advice
She advised: "Most medications should be stored in a cool, dry place and definitely speak to a pharmacist if your medicine changes colour, smell, or texture." The warning comes as temperatures continue to rise across the UK, prompting health officials to urge caution for those on regular medication.
