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As temperatures rise across the UK, doctors are warning people who take certain antidepressants and antipsychotic medications to be especially careful during heatwaves.
Health experts say some commonly prescribed mental health medicines can affect the body’s ability to control temperature, regulate sweating, and maintain hydration. This means some patients may be more vulnerable to heat exhaustion, dehydration, dizziness, and heat-related illness when temperatures climb.
The warning comes as the UK prepares for another period of hot weather, with forecasts suggesting temperatures could approach 29°C and remain elevated for several days. Following recent record-breaking temperatures, health officials are encouraging people to understand how their medication may interact with extreme heat.
Many people rely on antidepressants and antipsychotic medication to manage mental health conditions, and doctors stress that these medicines remain safe when taken correctly.
However, some medications can influence the body’s natural cooling systems.
Selective serotonin reuptake inhibitors (SSRIs), one of the most commonly prescribed groups of antidepressants in the UK, may affect sweating, hydration levels, and temperature regulation. Some antipsychotic medicines can also interfere with the body’s ability to cool itself efficiently.
During hot weather, this can increase the chance of experiencing symptoms such as:
In severe cases, overheating can contribute to heat stroke, which requires urgent medical attention.
Health professionals are reminding patients that they should not stop taking antidepressants or antipsychotics without medical guidance.
Dr Nick Broughton, NHS England’s national director for mental health, learning disabilities and autism, said people taking these medicines should take extra precautions during hot weather because some treatments may make it harder for the body to stay cool.
Experts recommend that patients continue taking medication exactly as prescribed and speak with their GP, pharmacist, or mental health team if they experience problems during hot weather.
Stopping antidepressants or antipsychotics suddenly can cause withdrawal symptoms and may worsen existing mental health conditions.
Some people taking mental health medication have shared how heatwaves affect their daily lives.
Magda Kanecka, a 22-year-old athlete who takes both antidepressants and antipsychotic medication, described experiencing severe heat exhaustion during previous hot periods.
She explained that during extreme temperatures she experienced dizziness, intense headaches, exhaustion, and moments where she felt close to fainting.
As someone who spends significant time outdoors through competitive cheerleading, she said managing the effects of heat has become an important part of her routine.
Her experience highlights why people who are new to medication should understand possible heat-related effects and prepare before temperatures rise.
Health charities and medical experts recommend several steps for people taking antidepressants or antipsychotics during hot weather.
Drinking enough fluids is one of the most important ways to help the body cope with heat. People should drink regularly throughout the day, especially if they are spending time outdoors or being physically active.
Where possible, avoid direct sunlight between late morning and afternoon when temperatures are usually highest.
If outdoor activities are necessary, try to schedule them during cooler parts of the day, such as early morning or evening.
Loose-fitting, lightweight, and breathable clothing can help the body maintain a comfortable temperature.
Close curtains or blinds during the hottest periods, open windows when temperatures drop, and use fans if available.
People should seek medical advice if they experience severe symptoms such as confusion, fainting, persistent dizziness, or signs of serious dehydration.
Doctors emphasise that heat sensitivity does not mean antidepressants or antipsychotics are unsafe.
Millions of people take these medications successfully, and the benefits of treatment often outweigh the risks. The key is awareness and preparation.
Professor Victoria Tzortziou Brown, president of the Royal College of GPs, explained that some antidepressants can influence temperature control, sweating, and hydration. Understanding these effects allows patients to take sensible precautions.
Similarly, experts from the Royal College of Psychiatrists advise patients not to stop medication because of concerns about heat. Instead, anyone experiencing difficulties should contact a healthcare professional for personalised advice.
Climate experts have warned that hotter summers and more frequent heatwaves are becoming a growing challenge for the UK.
While older adults, young children, and people with certain medical conditions are often highlighted as vulnerable groups, medication-related heat sensitivity is another important factor that many people may not know about.
Improving awareness can help patients stay safe while continuing essential mental health treatment.
A few simple actions, such as drinking enough water, avoiding extreme heat exposure, and checking medication advice with healthcare professionals, can significantly reduce the risk of heat-related illness.
People taking antidepressants and antipsychotic medication should take extra care during UK heatwaves, but they should not stop their treatment without medical advice.
Understanding how medication can affect the body’s response to heat allows patients to prepare and stay safe during periods of extreme temperatures.
As hotter summers become more common, awareness of medication-related heat risks will remain an important part of protecting public health.
This article is for general information purposes only and does not replace professional medical advice. Medication effects can vary between individuals. Anyone experiencing concerns about antidepressants, antipsychotics, or symptoms related to heat exposure should speak with a qualified healthcare professional before making changes to their treatment.