Millions of people who take commonly-prescribed medications in the UK have been issued "essential advice" by the UK government, which is very relevant this week, as hot temperatures for many areas have been forecast (but is relevant in any hot weather!).
Among the medications flagged by the Medicines and Healthcare products Regulatory Agency (MHRA) are ACE inhibitors and beta-blockers. There are also many more medicines mentioned by the agency, which are noted below.Ramipril is an ACE inhibitor widely used to treat high blood pressure and heart failure. And bisoprolol is among the most commonly-used beta blockers, which are used to treat angina, high blood pressure and heart failure, among other things.
On June 26, the MHRA issued advice on protecting your medicines during extreme heat and staying safe as the UK endured a heatwave of extreme temperatures which peaked at a record 37.7C and led to school closures.
This week, the temperatures are again expected to top 30C and reach as high as 34C in parts of the UK by Wednesday and Thursday.
Alison Cave, chief safety officer at the MHRA, said: "It’s easy to forget that medicines left in the heat – in cars, bags, or on sunny windowsills – might not work properly when you need them. Some medicines can also make you more likely to burn in the sun, feel dizzy, or get dehydrated, especially if you’re taking diuretics or have a condition like asthma, heart disease, or diabetes."
Why does heat affect medicines?
The MHRA says most medicines need to be stored at temperatures below 25C. At the end of June, many of us will have experienced rooms at home, workplaces or schools reaching and exceeding these temperatures. Heat "breaks down the active ingredients in medicines", the MHRA explains, and warns that medicines that need to be kept in the fridge "are especially vulnerable to heat". If medicine is affected by heat, it may not work properly.
Medicine can also affect how your body copes with heat
While we all know that your body loses more water through sweating when we're hot, the MHRA explains that "some medicines can make this worse, or make it harder for your body to cope with heat".
It specifically highlights some medicines, saying: "Blood pressure medicines such as ACE inhibitors, beta-blockers, or calcium channel blockers can also make it harder for your body to regulate temperature, especially during sudden hot spells. ACE inhibitors can even suppress your natural thirst response."
Commonly used ACE inhibitors in the UK include ramipril, captopril, enalapril and others. Commonly used beta-blockers include atenolol, bisoprolol, propranolol and others.
But the MHRA also adds that people taking the following medications should also be aware of a potentially intensified impact in hot weather:
Signs and symptoms of dehydration
Dehydration can cause dizziness, headaches, tiredness, confusion, and dark urine. This is particularly dangerous for older adults, young children, and people with heart or kidney conditions. If you start to feel unwell in the heat, move somewhere cooler, sip water slowly, and seek medical advice if you don’t feel better quickly.
How to keep medicines safe in the heat
The MHRA advice on keeping medicines safe in the heat includes:
Related Posts
Heatwave Warning : Be aware of some common medications that can increase the risk of overheating and dehydration : read it hereAlison Cave, chief safety officer at the MHRA, said: "It’s easy to forget that medicines left in the heat – in cars, bags, or on sunny windowsills – might not work properly when you need them. Some medicines can also make you more likely to burn in the sun, feel dizzy, or get dehydrated, especially if you’re taking diuretics or have a condition like asthma, heart disease, or diabetes."
Why does heat affect medicines?
The MHRA says most medicines need to be stored at temperatures below 25C. At the end of June, many of us will have experienced rooms at home, workplaces or schools reaching and exceeding these temperatures. Heat "breaks down the active ingredients in medicines", the MHRA explains, and warns that medicines that need to be kept in the fridge "are especially vulnerable to heat". If medicine is affected by heat, it may not work properly.
Medicine can also affect how your body copes with heat
While we all know that your body loses more water through sweating when we're hot, the MHRA explains that "some medicines can make this worse, or make it harder for your body to cope with heat".
It specifically highlights some medicines, saying: "Blood pressure medicines such as ACE inhibitors, beta-blockers, or calcium channel blockers can also make it harder for your body to regulate temperature, especially during sudden hot spells. ACE inhibitors can even suppress your natural thirst response."
Commonly used ACE inhibitors in the UK include ramipril, captopril, enalapril and others. Commonly used beta-blockers include atenolol, bisoprolol, propranolol and others.
But the MHRA also adds that people taking the following medications should also be aware of a potentially intensified impact in hot weather:
- "Some diabetes medicines, including insulin and metformin, also increase the risk of dehydration or make early symptoms harder to spot."
- "Antipsychotic medications, such as olanzapine or quetiapine, or stimulant medications for attention disorders can increase your body temperature, making you overheat more easily."
- "People taking diuretics, or ‘water tablets’, such as furosemide, are already losing more fluid through urination."
Signs and symptoms of dehydration
Dehydration can cause dizziness, headaches, tiredness, confusion, and dark urine. This is particularly dangerous for older adults, young children, and people with heart or kidney conditions. If you start to feel unwell in the heat, move somewhere cooler, sip water slowly, and seek medical advice if you don’t feel better quickly.
How to keep medicines safe in the heat
The MHRA advice on keeping medicines safe in the heat includes:
- Store medicines somewhere cool, dry and out of direct sunlight
- Avoid leaving them in cars or in bags left in sunlight
- Know the signs of heat-related illness
- Stay hydrated and listen to your body
- Take extra care in the sun if your medicine makes your skin more likely to burn
- Read the leaflet and speak to a healthcare professional if you have any questions.
Related Posts
It's hot - heatwave health alert and ways to cope with Type 1 Diabetes in the heat, read it here
When It's Hot Stay Hydrated, read it here
All the best Jan

Thank you Jan!!!
ReplyDeletePerfect timing for this much needed information, Jan! Thank you so much, dear friend.
ReplyDeleteThank you so much Jan - this is such important recommendations. I'm just looking at our room temperature this evening is already more than 25 degrees here at 10 pm! In Australia we are used to higher temperatures but we can cool our homes down, in the UK our meds sit in rooms with much higher temperatures (this summer anyway!)
ReplyDeleteTake care, drink more and enjoy that sunshine!
Wren x
That's good to know.
ReplyDeleteJan, this was extremely helpful. Thank you so very much.
ReplyDeleteThank you, Jan, for being our minister of information. Have a great week.
ReplyDelete..fortunately, I don't take these!
ReplyDeleteGreat tips!!!
ReplyDeleteGracias por la recomendación. Te mando un beso.
ReplyDeleteWhat a helpful post! Thanks for sharing this information!
ReplyDeleteIt doesn't hurt to be reminded to be careful with medication.
ReplyDeleteThank you, Jan.
Good to know this-Christine cmlk79.blogspot.com
ReplyDeleteMost medicines here are clearly labelled "store in a cool dry place" or "keep refrigerated" if that is necessary.
ReplyDeletehydration when it hot. for me, that is so important. i can't really tolerate the heat but if i stay hydrated, i do better!!
ReplyDeleteThanks for the warning, Jan Hvala, of course I take medication for blood pressure and heart failure myself.
ReplyDeleteHug and kiss, Andreja!
Interesting article. Thanks for sharing. Avril x
ReplyDeleteThank you Jan!!! These tips are so important.
ReplyDeleteThis was quite informative.
ReplyDeleteGood post and informative, advice in the heat.
ReplyDeleteMany thanx Jan. God bless.
ReplyDeleteGood common sense...
ReplyDeletehugs
Donna
Jan, thank you for sharing this valuable information with us. Thankfully, I'm not on these medications, but it's good information to know. I'm so sorry to hear that you are still dealing with the extreme heat. Ours has finally cooled down a bit but it's still humid. We need a good rain now. xx
ReplyDeleteThank you Jan, for all the tips and information.
ReplyDeleteI am lucky so far and do not take any medications.
Take care, have a great day!
That's something I've never thought about. Thanks for the info
ReplyDeleteA very interesting and important article. Thanks Jan :) all the best, Denise
ReplyDeleteHi Jan,
ReplyDeleteThank you for sharing this excellent information.
With this heat, extra care is needed.
Hugs from Maria
On our recent vacation, I had my Synthroid pill melt in my carry on in the car. That's the first time I've experienced anything like that! Fortunately, it was the last day.
ReplyDeleteMuy interesante blog, pasaré a visitar con regularidad.
ReplyDeleteSaludos.
Grazie mille per queste utilissime informazioni.
ReplyDeleteQuella della temperatura la sapevo
excellent ,very helpful dear Jan !
ReplyDeleteyes we have been not just reading cautions written on medicines but we have been trying too follow the instructions as well and saving medicines from heat is on top of that ,we usually keep them in bedroom where room temperature is least
GOOGLE TRANSLATE
ReplyDeleteJ.P. Alexander
Gracias por la recomendación. Te mando un beso.
Thanks for the recommendation. Sending you a kiss.
Acuarelas Linares
Muy interesante blog, pasaré a visitar con regularidad.
Saludos.
A very interesting blog; I'll be visiting regularly.
Best regards.
Stefania
Grazie mille per queste utilissime informazioni.
Quella della temperatura la sapevo
Thank you very much for this very useful information.
I already knew about the temperature.
Very excellent post with information people need to know.
ReplyDeleteI wonder if one of my meds is doing that to me because I can't seem to take the heat well at all anymore, I thought it might be my age or something else.
ReplyDeleteGood advice! I am very sensative to high heat and make sure I hydrate frequently. I love summer, but winter weather suits me better.
ReplyDelete