MHRA warns people on antibiotics and antidepressants in heatwave | Weather | News
Read directions when taking medications in hot weather (Image: Catherine Falls Advertisement via Getty Images)
With temperatures now soaring above 30C across much of the UK, the Medicines and Healthcare products Regulatory Agency (MHRA) has issued important guidance for those taking antibiotics, diuretics or antidepressants.
Hot weather changes the way your body responds to medication, which can affect people managing long-term conditions; But a handful of simple precautions can help prevent complications. “Let’s face it – when there’s a heatwave, most of us are focused on getting out and enjoying the weather,” said Alison Cave, MHRA’s Safety Manager.
“But it’s easy to forget that medications left out in the heat (in cars, bags, or on sunny windowsills) may not work properly when you need them.” In fact, some commonly used medications can significantly increase your skin’s susceptibility to burning in even moderate sunlight.
These include some antibiotics, diuretics, antidepressants, or topical treatments for acne or eczema. Painkillers such as ibuprofen or naproxen are also known to occasionally trigger mild sun sensitivity, but this is less common and is usually only an issue with regular or long-term use.
One medication to be particularly careful of is methotrexate, which is prescribed for conditions such as rheumatoid arthritis, psoriasis, Crohn’s disease and cancer. It may cause extreme skin sensitivity to the sun, even at low doses. This can cause a painful rash, blisters, or swelling that resembles a severe sunburn. In rare cases, these reactions have led to serious infections.
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The risk increases in sunny weather, especially if you spend more time outside; whether you’re walking your dog, gardening or going on holiday. Even a short walk at lunch or a train ride in the sun can be enough to trigger a reaction in some people.
If you are taking any medications, always read the patient information leaflet or check with your pharmacist to determine if sun sensitivity is listed as a side effect.
Well Pharmacy UK echoed the MHRA’s guidance on TikTok, stating: “Hot weather can affect both you and your medicines.”
He adds: “In hot weather, remember:
- Check medication storage instructions
- Keep medications away from direct sunlight
- stay hydrated
- Protect your skin with SPF, shade and light clothing.”
Alison summarized: “To stay safe in the heat:
- Store medications in a cool, dry place and away from direct sunlight; especially if you are outside
- Learn the symptoms of heat-related diseases; stay hydrated and listen to your body
- If your medication makes your skin more likely to burn, pay more attention to the sun
“And remember, it is important to read the leaflet for all medications and talk to a healthcare professional if you have any questions.”
Medical devices should not be ignored either because extreme temperatures can also damage them. The MHRA warns: “It’s not just medicines; some medical devices can also be affected by heat or humidity. For example, blood glucose meters can give people struggling with diabetes less reliable readings when used or stored in hot conditions.
“Keep devices and test strips in a cool, dry place and check the instructions that come with them for any temperature information. If your device is not working as expected, try a follow-up check or contact your pharmacist for advice.”
