The UK government and the NHS has issued essential guidance everyone must follow09:02, 03 Aug 2026Brits on certain medications have been urged to be careful this week. The UK has already seen an extremely hot summer this year, with warm weather continuing.‌There has also been a lack of rainfall, leaving much of the UK experiencing bright, sunny days. While many enjoy the warm weather outdoors, people on certain medications must exercise caution.‌The Medicines and Healthcare products Regulatory Agency (MHRA) advise to store medicines somewhere cool, dry and out of direct sunlight. You must stay hydrated and use sun protection if taking medicines that increase sensitivity to sunlight.‌The NHS Specialist Pharmacy Service explained: "Hot weather changes how the body responds to some medicines, which could impact people managing long-term conditions."What to do if you're taking antibiotics and antifungal medicationsIt has issued specific advice for anyone taking antibiotics and antifungal medications. This includes antibiotics such as ciprofloxacin, doxycycline, metronidazole, and tetracycline, and antifungals such as itraconazole, griseofulvin, and voriconazole.‌The Specialist Pharmacy Service said anyone taking these tablets should: "Advise sun avoidance where possible, the use of protective clothing and hats, and broad-spectrum sunscreen (SPF 30 or higher). Review if severe skin reactions occur."These medicines may increase sensitivity to sunlight and cause a sunburn-like skin reaction (photosensitivity)."The MHRA shared the same advice as it explained medicines can make your skin more likely to burn, even in mild sunshine. It said: "This includes some antibiotics, diuretics, antidepressants, or skin treatments for acne or eczema.‌"Painkillers such as ibuprofen or naproxen are also known to sometimes cause mild sun sensitivity, but this is less common and usually only a concern with frequent or long-term use."The MHRA added: "The risk goes up during sunny weather, especially if you’re outside more – whether you’re walking the dog, gardening, or heading off on holiday. Even a short walk at lunchtime or a train ride in the sun can be enough to trigger a reaction for some people."If you take any medicines, always read the patient information leaflet or check with your pharmacist to see if sun sensitivity is a side effect."‌How to stay safe when taking medications this summerThe MHRA has three essential tips for protecting your medication as well as staying safe in the heat.1. Keep medicines out of hot cars and direct sunlight‌According to the MHRA, most medicines need to be stored at temperatures below 25°C, yet cars, trains and buses can heat up quickly during the summer.Rooms with direct sunlight can get hot, as well as bags and pockets. Heat can cause problems to medicines as it can break down active ingredients, meaning it might not work properly.The MHRA said: "If your medicine has changed colour, developed an unusual smell, changed texture, or looks different in any way, this could signal heat damage. Ask your pharmacist for advice."‌2. Drink more water and stay coolIn the hot weather, your body loses more water through sweating. Yet, some medicines such as diuretics or blood pressure medication can make this worse.This can cause dehydration and mineral imbalances. Blood pressure medicines such as ACE inhibitors, beta-blockers, or calcium channel blockers can make it harder for your body to regulate temperature.Article continues below3. Check if your medicine increases your risk of sunburnIf you take any medicines, always read the patient information leaflet or check with your pharmacist to see if sun sensitivity is a side effect. It can make your skin more likely to burn, even in mild sunshine.