Intense heatwaves pose a significant risk of rapid dehydration, warn medical professionals. The Association of General Practitioners and the Society of General Medicine of the Czech Medical Society JEP are issuing guidance on staying healthy during the anticipated heat. Losing critical fluids can have serious health consequences, experts emphasize. Recommendations focus on proactively replenishing fluids lost through perspiration. The advice aims to help the public navigate the upcoming heatwave safely and avoid heat-related illnesses. Staying adequately hydrated is presented as a key preventative measure.